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David Dunaief

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Walking may reduce the need for dialysis. METRO photo
Simple lifestyle changes can have an impact

By David Dunaief, M.D.

Dr. David Dunaief

On the heels of National Kidney Month in March, let’s look more closely at strategies for reducing chronic kidney disease (CKD). Those at highest risk for CKD include patients with diabetes, high blood pressure and those with first-degree relatives who have advanced disease. But those are only the ones at highest risk.

CKD is tricky because, similar to high blood pressure and dyslipidemia (high cholesterol), it tends to be asymptomatic, at least initially. Only in the advanced stages do symptoms become distinct, though there can be vague symptoms in moderate stages such as fatigue, malaise and loss of appetite.

What are the CKD stages?

CKD is classified into five stages based on the estimated glomerular filtration rate (eGFR), a way to determine kidney function. Stages 1 and 2 are the early stages, while stages 3a and 3b are the moderate stages, and finally stages 4 and 5 are the advanced stages. Stage 5 is end-stage renal disease, or kidney failure.

Who should be screened?

According to the U.S. Preventive Services Task Force and the American College of Physicians, those who are at highest risk should be screened including, as I mentioned above, patients with diabetes or hypertension (1)(2). 

In an interview on Medscape.com, “Proteinuria: A Cheaper and Better Cholesterol?” two high-ranking nephrologists suggest that first-degree relatives to advanced CKD patients should also be screened and that those with vague symptoms of fatigue, malaise and/or decreased appetite may also be potential screening candidates (3). This broadens the asymptomatic population that may benefit from screening.

Slowing CKD progression

Fortunately, there are several options available, ranging from preventing CKD with specific exercise to slowing the progression with lifestyle changes and medications.

How much exercise?

Here we go again, preaching the benefits of exercise. But what if you don’t really like exercise? It turns out that the results of a study show that walking reduces the risk of death and the need for dialysis by 33 percent and 21 percent respectively (4). And although some don’t like formal exercise programs, most people agree that walking is enticing.

The most prevalent form of exercise in this study was walking. Even more intriguing, the results are based on a dose-response curve. In other words, those who walked more often saw greater results. So, the participants who walked one-to-two times per week had a significant 17 percent reduction in death and a 19 percent reduction in kidney replacement therapy, while those who walked at least seven times per week experienced a more impressive 59 percent reduction in death and a 44 percent reduction in the risk of dialysis. There were 6,363 participants for an average duration of 1.3 years.

How much protein to consume?

When it comes to CKD, more protein is not necessarily better, and may even be harmful. In a meta-analysis (a group of 10 randomized controlled trials) of Cochrane database studies, results showed that the risk of death or treatment with dialysis or kidney transplant was reduced by 32 percent in those who consumed less protein compared to unrestricted protein (5). According to the authors, as few as two patients would need to be treated for a year in order to prevent one from either dying or reaching the need for dialysis or transplant.

Sodium: How much is too much?

Good news! In a study, results showed that a modest sodium reduction in our diet may be sufficient to help prevent proteinuria (protein in the urine) (6). Here, less than 2000 mg was shown to be beneficial, something all of us can achieve.

Medications have a place

We routinely give certain medications, ACE inhibitors or ARBs, to patients who have diabetes to protect their kidneys. What about patients who do not have diabetes? ACEs and ARBs are two classes of anti-hypertensives — high blood pressure medications — that work on the RAAS system of the kidneys, responsible for blood pressure and water balance (7). Results of a study show that these medications reduced the risk of death significantly in patients with moderate CKD. Most of the patients were considered hypertensive.

However, there was a high discontinuation rate among those taking the medication. If you include the discontinuations and regard them as failures, then all who participated showed a 19 percent reduction in risk of death, which was significant. However, if you exclude discontinuations, the results are much more robust with a 63 percent reduction. To get a more realistic picture, this result, including both participants and dropouts, is probably close to what will occur in clinical practice unless the physician is a really good motivator or has very highly motivated patients.

While these two classes of medications, ACE inhibitors and ARBs, are good potential options for protecting the kidneys, they are not the only options. You don’t necessarily have to rely on drug therapies, and there is no downside to lifestyle modifications. Lowering sodium modestly, walking frequently, and lowering your protein consumption may all be viable options, with or without medication, since medication compliance was woeful. Screening for asymptomatic, moderate CKD may lack conclusive studies, but screening should occur in high-risk patients and possibly be on the radar for those with vague symptoms of lethargy as well as aches and pains. Of course, this is a discussion to have with your physician.

References:

(1) uspreventiveservicestaskforce.org (2) aafp.org. (3) Medscape.com. (4) Clin J Am Soc Nephrol. 2014;9(7):1183-9. (5) Cochrane Database Syst Rev. 2009;(3):CD001892. (6) Curr Opin Nephrol Hypertens. 2014;23(6):533-540. (7) J Am Coll Cardiol. 2014;63(7):650-658.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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There are many fruits and vegetables that are beneficial for kidney health. METRO photo
Increasing fruits and vegetables may protect kidneys

By David Dunaief, M.D.

Dr. David Dunaief

Chronic kidney disease is on the rise in this country. Approximately 37 million U.S. adults have chronic kidney disease (CKD), with as many as 9 in 10 not aware they have it, according to the Centers for Disease Control and Prevention (CDC) (1). In this article, we will look beyond the more obvious causes of chronic kidney disease, like diabetes, smoking, aging, obesity and high blood pressure (2).

Why is early-stage CKD so important? It is associated with a 40 percent increased risk of developing cardiovascular events, such as heart attacks (3). It also significantly increases the risk of peripheral artery disease (PAD). Those with decreased kidney function have a 24 percent prevalence of PAD, compared to 3.7 percent in those with normal kidney function (4). Of course, it can lead ultimately to end-stage renal (kidney) disease, requiring dialysis and potentially a kidney transplant.

One of the problems with early-stage CKD is that it tends to be asymptomatic. However, there are simple tests, such as a basic metabolic panel and a urinalysis, that will indicate whether a patient may have mild chronic kidney disease. These indices for kidney function include an estimated glomerular filtration rate (eGFR), creatinine level and protein in the urine. While the other two indices have varying ranges depending on the laboratory used, a patient with an eGFR of 30 to 59 mL/minute/1.73 m2 is considered to have mild disease. The eGFR and the kidney function are inversely related, meaning as eGFR declines, the more severe the chronic kidney disease.

What can be done to stem early-stage CKD, before complications occur? There are several studies that have looked at medications and lifestyle modifications and their impacts on its prevention, treatment and reversal. Let’s look at the evidence.

Leveraging Medications

Allopurinol is usually thought of as a medication to prevent gout. However, in a randomized controlled trial, with 113 patients, results show that allopurinol may help to slow the progression of CKD, defined in this study as an eGFR less than 60 mL/min/1.73 m2 (5). The group using 100 mg of allopurinol showed significant improvement in eGFR levels (compared to the control group over a two-year period. The researchers concluded that allopurinol slowed CKD progression. Allopurinol also decreased cardiovascular risk by 71 percent.

Fibrates are a class of drug usually used to boost HDL (“good”) cholesterol levels and reduce triglyceride levels, another cholesterol marker. Fibrates have gotten negative press for not showing improvement in cardiovascular outcomes. However, in patients with mild to moderate CKD, a meta-analysis (a group of 10 studies) showed a 30 percent reduction in major cardiovascular events and a 40 percent reduction in the risk of cardiovascular mortality with the use of fibrates (6). This is important, since patients with CKD are mostly likely to die of cardiovascular disease.

The authors concluded that fibrates seem to have a much more powerful beneficial effect in CKD patients, as opposed to the general population. So, there may be a role for fibrates after all.

Diet’s impact

Fruits and vegetables may play a role in helping patients with CKD. In one study, the results showed that fruits and vegetables work as well as sodium bicarbonate in improving kidney function by reducing metabolic acidosis levels (7).

What is the significance of metabolic acidosis? It means that body fluids become acidic, and it is associated with chronic kidney disease. The authors concluded that both sodium bicarbonate and a diet including fruits and vegetables were renoprotective, helping to protect the kidneys from further damage in patients with CKD. Alkali diets are primarily plant-based, although not necessarily vegetarian or vegan diets. Animal products tend to cause an acidic environment. The study was one year in duration with 77 patients.

In the Nurses’ Health Study, results show that animal fat, red meat and sodium all negatively impact kidney function (8). The risk of protein in the urine, a potential indicator of CKD, increased by 72 percent in those participants who consumed the highest amounts of animal fat compared to the lowest, and by 51 percent in those who ate red meat at least twice a week. With higher amounts of sodium, there was a 52 percent increased risk of having lower levels of eGFR.

The most interesting part with sodium was that the difference between higher mean consumption and the lower mean consumption was not that large, 2.4 grams compared to 1.7 grams. In other words, the difference between approximately a teaspoon of sodium and three quarters of a teaspoon was responsible for the decrease in kidney function.

In my practice, when CKD patients follow a vegetable-rich, nutrient-dense diet, there are substantial improvements in kidney functioning. For instance, for one patient, his baseline eGFR was 54 mL/min/1.73 m2. After one month of lifestyle modifications, his eGFR improved by 9 points to 63 mL/min/1.73 m2, which is a return to “normal” functioning of the kidney. Note that this is an anecdotal story and not a study.

Therefore, it is important to have your kidney function checked with mainstream tests. If the levels are low, you should address the issue through medications and/or lifestyle modifications to manage and reverse early-stage CKD. Don’t wait until symptoms and complications occur. In my experience, it is much easier to treat and reverse a disease in its earlier stages, and CKD is no exception.

References:

(1) CDC.gov. (2) JAMA. 2004;291:844-850. (3) N Engl J Med. 2004;351:1296-1305. (4) Circulation. 2004;109:320–323. (5) Clin J Am Soc Nephrol. 2010 Aug;5:1388-1393. (6) J Am Coll Cardiol. 2012 Nov. 13;60:2061-2071. (7) Clin J Am Soc Nephrol. 2013;8:371-381. (8) Clin J Am Soc Nephrol. 2010; 5:836-843.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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Bananas are rich in potassium. METRO photo
Most Americans don’t consume enough potassium

By David Dunaief, M.D.

Dr. David Dunaief

With all the focus on reducing sodium in our diets, the importance of consuming potassium gets short shrift. 

More than 90 percent of people consume far too much sodium, with salt being the primary culprit (1). Sodium is insidious; it’s in foods that don’t even taste salty. Bread products are among the primary offenders. Other foods with substantial amounts of sodium are cold cuts and cured meats, cheeses, pizza, poultry, soups, pastas and, of course, snack foods. Processed foods and those prepared by restaurants are where most of our consumption occurs (2).

On the flip side, only about two percent of people get enough potassium from their diets (3). According to one study, we would need to consume about eight sweet potatoes or 10 bananas each day to reach appropriate levels. 

Why is it important to reduce sodium and increase potassium? A high sodium-to-potassium ratio increases the risk of cardiovascular disease by 46 percent, according to the study, which looked at more than 12,000 Americans over almost 15 years (4). In addition, both may have significant impacts on blood pressure and cardiovascular disease.

To improve our overall health, we need to shift the sodium-to-potassium balance so that we consume more potassium and less sodium. Let’s look at the evidence.

Reduce your sodium

Two studies illustrate the benefits of reducing sodium in high blood pressure and normotensive (normal blood pressure) patients, ultimately preventing cardiovascular disease, including heart disease and stroke.

The first used the prestigious Cochrane review to demonstrate that blood pressure is reduced by a significant mean of −4.18 mm Hg systolic (top number) and −2.06 mm Hg diastolic (bottom number) involving both normotensive and hypertensive participants (5). When looking solely at hypertensive patients, the reduction was even greater, with a systolic blood pressure reduction of −5.39 mm Hg and a diastolic blood pressure reduction of −2.82 mm Hg.

This was a meta-analysis (a group of studies) that evaluated data from randomized clinical trials, the gold standard of studies. There were 34 trials reviewed with more than 3,200 participants. Salt was reduced from 9 to 12 grams per day to 5 to 6 grams per day. These levels were determined using 24-hour urine tests. The researchers believe there is a direct linear effect with salt reduction. In other words, the more we reduce the salt intake, the greater the effect of reducing blood pressure. The authors concluded that these effects on blood pressure will most likely result in a decrease in cardiovascular disease.

In the second study, a meta-analysis of 42 clinical trials, there was a similarly significant reduction in both systolic and diastolic blood pressures (6). This study included adults and children. Both demographics saw a reduction in blood pressure, though the effect was greater in adults. Interestingly, an increase in sodium caused a 24 percent increased risk of stroke incidence but, more importantly, a 63 percent increased risk of stroke mortality. The risk of mortality from heart disease was increased as well, by 32 percent.

In an epidemiology modeling study, the researchers projected that either a gradual or instantaneous reduction in sodium would save lives (7). For instance, a modest 40 percent reduction over 10 years in sodium consumed could prevent 280,000 premature deaths. These are only projections, but in combination with the above studies may be telling. The bottom line: decrease sodium intake by almost half and increase potassium intake from foods.

Increase your potassium

When we think of blood pressure, not enough attention is given to potassium. The typical American diet doesn’t contain enough of this mineral.

In a meta-analysis involving 32 studies, results showed that as the amount of potassium was increased, systolic blood pressure decreased significantly (8). When foods containing 3.5 to 4.7 grams of potassium were consumed, there was an impressive −7.16 mm Hg reduction in systolic blood pressure with high blood pressure patients. Anything more than this amount of potassium did not have any additional benefit. Increased potassium intake also reduced the risk of stroke by 24 percent. This effect was important.

The reduction in blood pressure was greater with increased potassium consumption than with sodium restriction, although there was no head-to-head comparison done. The good news is that potassium is easily attainable in the diet. Foods that are potassium-rich include bananas, sweet potatoes, almonds, raisins and green leafy vegetables such as Swiss chard.

Lowering sodium intake may have far-reaching benefits, and it is certainly achievable. First, consume less and give yourself a brief period to adapt — it takes about six weeks to retrain your taste buds, once you cut your sodium. You can also improve your odds by increasing your dietary potassium intake, which also has a substantial beneficial effect, striking a better sodium-to-potassium balance.

References:

(1) Am J Clin Nutr. 2012 Sep;96(3):647-657. (2) www.cdc.gov. (3) Am J Clin Nutr. 2012 Sep;96(3):647-657. (4) Arch Intern Med. 2011;171(13):1183-1191. (5) BMJ. 2013 Apr 3;346:f1325. (6) BMJ. 2013 Apr 3;346:f1326. (7) Hypertension. 2013; 61: 564-570. (8) BMJ. 2013; 346:f1378.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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Osteoarthritis osteoarthritis affects joints in your hands, knees, hips and spine. METRO photo

By David Dunaief

Dr. David Dunaief

Osteoarthritis most commonly affects the knees, hips and hands. If you suffer from it, you know it can be painful to perform daily tasks or to get around. There are some surgical solutions, such as joint replacements of the hips or knees, as well as medical approaches with pain medications. The most commonly used first-line medications are acetaminophen and nonsteroidal anti-inflammatory drugs, such as ibuprofen. Unfortunately, while medications treat the immediate symptoms of pain and inflammation, they don’t slow osteoarthritis’ progression, and they do have side effects, especially with long-term use.

Here, we’ll focus on nonpharmacologic approaches you can use to ease pain — and perhaps slow worsening of your osteoarthritis.

Does dairy help or hurt?

With dairy, specifically milk, there is conflicting information. Some studies show benefits, while others show that it may contribute to the inflammation that makes osteoarthritis feel worse.

In the Osteoarthritis Initiative study, an observational study of over 2,100 patients, results showed that low-fat (1 percent) and nonfat milk may slow the progression of osteoarthritis in women (1). The researchers looked specifically at joint space narrowing that occurs in those with affected knee joints. Compared to those who did not drink milk, patients who did saw significantly less narrowing of knee joint space over a 48-month period.

Osteoarthritis affects joints in your hands, knees, hips and spine. METRO photo

The result curve was interesting, however. For those who drank from fewer than three glasses a week up to 10 glasses a week, the progression of joint space narrowing was slowed. However, for those who drank more than 10 glasses per week, there was less beneficial effect. There was no benefit seen in men or with the consumption of higher fat products, such as cheese or yogurt.

However, the study had significant flaws. First, the patients were only asked about their milk intake at the study’s start. Second, patients were asked to recall their weekly milk consumption for the previous 12 months before the study began — a challenging task. Third, confounding factors, such as orange consumption, were not examined.

On the flip side, a study of almost 39,000 participants from the Melbourne Collaborative Cohort Study found that increases in dairy consumption were associated with increased risk of total hip replacements for men with osteoarthritis (2).

Getting more specific, a recently published analysis of the Framingham Offspring Study found that those who consumed yogurt had statistically significant lower levels of interleukin-6 (IL-6), a marker for inflammation, than those who didn’t eat yogurt, but that this was not true with milk or cheese consumption (3).

We are left with more questions than answers. Would I recommend consuming low-fat or nonfat milk or yogurt? Not necessarily, but I may not dissuade osteoarthritis patients from yogurt.

Vitamin D

Over the last decade, the medical community has gone from believing that vitamin D was potentially the solution to many diseases to wondering whether, in some cases, low levels were indicative of disease, but repletion was not a change-maker. Well, in a randomized controlled trial (RCT), the gold standard of studies, vitamin D had no beneficial symptom relief, nor any disease-modifying effects (4). This two-year study of almost 150 men and women raised blood levels of vitamin D on average to 36 ng/ml, which is considered respectable. Researchers used MRI and X-rays to track their results.

Weight loss

This could not be an article on osteoarthritis if I did not talk about weight. In a study involving 112 obese patients, there was not only a reduction of knee symptoms in those who lost weight, but there was also disease modification, with reduction in the loss of cartilage volume around the medial tibia (5).

On the other hand, those who gained weight saw the inverse effect. A reduction of tibial cartilage is potentially associated with the need for knee replacement. The relationship was almost one-to-one; for every 1 percent of weight lost, there was a 1.2 mm3 preservation of medial tibial cartilage volume, while the exact opposite was true with weight gain.

Exercise and diet

In a study, diet and exercise trumped the effects of diet or exercise alone (6). Patients with osteoarthritis of the knee who lost at least 10 percent of their body weight experienced significant improvements in function and a 50 percent reduction in pain, as well as reduction in inflammation, compared to those who lost 5 to 10 percent and those who lost less than 5 percent. This study was a well-designed, randomized controlled single-blinded study with a duration of 18 months.

Researchers used biomarker IL6 to measure inflammation. The diet and exercise group and the diet-only group lost significantly more weight than the exercise-only group, 23.3 pounds and 19.6 pounds versus 4 pounds. The diet portion consisted of a meal replacement shake for breakfast and lunch and then a vegetable-rich, low-fat dinner. Low-calorie meals replaced the shakes after six months. The exercise regimen included one hour of a combination of weight training and walking with alacrity three times per week.

Therefore, concentrate on lifestyle modifications if you want to see potentially disease-modifying effects. These include both exercise and diet. In terms of low-fat or nonfat milk, the results are controversial at best. For yogurt, the results suggest it may be beneficial for osteoarthritis, but stay on the low end of consumption. And remember, the best potential effects shown are with weight loss and with a vegetable-rich diet.

References:

(1) Arthritis Care Res online. 2014 April 6. (2) J Rheumatol. 2017 Jul;44(7):1066-1070. (3) Nutrients. 2021 Feb 4;13(2):506. (4) JAMA. 2013;309:155-162. (5) Ann Rheum Dis. 2015 Jun;74(6):1024-9. (6) JAMA. 2013;310:1263-1273.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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If you sneeze and cough during certain times of the year, you may have seasonal allergies. Photo from Pixabay
Reducing inflammation may diminish symptoms
Dr. David Dunaief

By David Dunaief, M.D.

This weekend, after a week of warmer weather, we will adjust our clocks for Daylight Savings Time, the unofficial end of winter. We look forward to longer days, flowering gardens and “greening” trees. However, for people who suffer from seasonal allergic rhinitis, hay fever, seasonal allergies or whatever you would like to call it, life is about to get miserable.

Just over 19 million U.S. adults were diagnosed with seasonal allergies in 2018, and an additional 5.2 million children were diagnosed, according to the Centers for Disease Control and Prevention (1).

The triggers for seasonal allergies are diverse. They include pollen from leafy trees and shrubs, grass and flowering plants, as well as weeds, with the majority from ragweed (mostly in the fall) and fungus (summer and fall) (2).

What sparks allergic reactions? 

A chain reaction occurs in seasonal allergy sufferers. When foreign substances such as allergens (pollen, in this case) interact with immunoglobulin E (IgE), antibodies that are part of our immune system, they cause mast cells in the body’s tissues to degrade and release inflammatory mediators. These include histamines, leukotrienes and eosinophils in those who are susceptible. In other words, it is an allergic inflammatory response.

The revved up immune system then responds with sneezing; red, itchy and watery eyes; scratchy throat; congestion; sinus headaches; postnasal drip; runny nose; diminished taste and smell; and even coughing (3). Basically, it emulates a cold, but without the virus. If symptoms last more than 10 days and are recurrent, then it is more than likely you have allergies.

If allergic rhinitis is not properly treated, complications such as ear infections, sinusitis, irritated throat, insomnia, chronic fatigue, headaches and even asthma can result (4).

Medical treatment options 

The best way to treat allergy attacks is to prevent them, but this is can mean closing yourself out from the enjoyment of spring by literally closing the windows, using the air-conditioning, and using recycling vents in your car.

On the medication side, we have intranasal glucocorticoids (steroids), oral antihistamines, allergy shots, decongestants, antihistamine and decongestant eye drops, and leukotriene modifiers (second-line only).

The guidelines for treating seasonal allergic rhinitis with medications suggest that intranasal corticosteroids (steroids) should be used when quality of life is affected. If there is itchiness and sneezing, then second-generation oral antihistamines may be appropriate (5). Two well-known inhaled steroids that do not require a prescription are Nasacort (triamcinolone) and Flonase (fluticasone propionate). While inhaled steroids are probably most effective in treating and preventing symptoms, they need to be used every day and do have side effects.

Oral antihistamines, on the other hand, can be taken on an as-needed basis. Second-generation antihistamines, such as loratadine (Claritin), cetirizine (Zyrtec) and fexofenadine (Allegra), have less sleepiness as a side effect than first-generation antihistamines.

Alternative treatments 

Butterbur (Petasites hybridus), an herb, has several small studies that indicate its efficacy in treating hay fever. In one randomized controlled trial (RCT) involving 131 patients, results showed that butterbur was as effective as cetirizine (Zyrtec) in treating this disorder (6).

In another RCT, results showed that high doses of butterbur — 1 tablet given three times a day for two weeks — was significantly more effective than placebo (7). Researchers used butterbur Ze339 (carbon dioxide extract from the leaves of Petasites hybridus L., 8 mg petasines per tablet) in the trial.

A post-marketing follow-up study of 580 patients showed that, with butterbur Ze339, symptoms improved in 90 percent of patients with allergic rhinitis over a two-week period (8). Gastrointestinal upset occurred as the most common side effect in 3.8 percent of the population.

The caveats to the use of butterbur are several. First, the studies were short in duration. Second, the leaf extract used in these studies was free of pyrrolizidine alkaloids (PAs). This is very important, since PAs may not be safe. Third, the dose was well-measured, which may not be the case with over-the-counter extracts. Fourth, you need to ask about interactions with your prescription medications.

Dietary interventions 

While there are no significant studies on diet, there is one review of literature that suggests that a plant-based diet may reduce symptoms of allergies, specifically rhinoconjunctivitis, affecting the nose and eyes, as well as eczema and asthma. This is according to the International Study of Asthma and Allergies in Childhood study in 13- to 14-year-old teens (9). In my clinical practice, I have seen patients who suffer from seasonal allergies improve and even reverse the course of allergies over time with a vegetable-rich, plant-based diet, possibly due to its anti-inflammatory effect.

While allergies can be miserable, there are a significant number of over-the-counter and prescription options to help reduce symptoms. Diet may play a role in the disease process by reducing inflammation, though there are no formal studies. There does seem to be promise with some herbs, especially butterbur. However, alternative supplements and herbs lack large, randomized clinical trials with long durations. Always consult your doctor before starting any supplements, herbs or over-the-counter medications.

References:

(1) CDC.gov. (2) acaai.org/allergies/types/pollen-allergy. (3) J Allergy Clin Immunol. 2003 Dec;112(6):1021-31. (4) J Allergy Clin Immunol. 2010 Jan;125(1):16-29. (5) Otolaryngol Head Neck Surg. 2015 Feb;2:197-206. (6) BMJ 2002;324:144. (7) Arch Otolaryngol Head Neck Surg. 2004 Dec;130(12):1381-6. (8) Adv Ther. Mar-Apr 2006;23(2):373-84. (9) Eur Respir J. 2001;17(3):436-443.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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Aerobic exercise is good for the brain. METRO photo
Exercise may improve mild cognitive impairment

By David Dunaief, M.D.

Dr. David Dunaief

As we consider aging, many of us fear loss of our mental capability as much as loss of our physical capabilities. Yet, just as with physical capabilities, age is not the only determinant.

Mild cognitive impairment (MCI) is feared, not only for its own challenges but also because it may lead to dementia, with Alzheimer’s disease and vascular dementia being the more common forms. Prevalence of MCI may be as high as one-in-five in those over age 70 (1). It is thought that those with MCI may have a 10 percent chance of developing Alzheimer’s disease (2).

So, the most compelling questions are: What increases risk and what can we do to minimize the risk of developing cognitive impairment? Many chronic diseases and disorders contribute to MCI risk. These include diabetes, heart disease, Parkinson’s disease and strokes. If we can control these, we may reduce our risk of cognitive decline.

Heart disease creates substantial risk

In an observational study, results demonstrated that those suffering from years of heart disease are at a substantial risk of developing MCI (3). The study involved 1,450 participants who were between the ages of 70 and 89 and were not afflicted by cognitive decline at the beginning of the study. Patients with a history of cardiac disease had an almost two times greater risk of developing nonamnestic MCI, compared to those individuals without cardiac disease. Women with cardiac disease were affected even more, with a three times increased risk of cognitive impairment.

Nonamnestic MCI can affect executive functioning — decision-making abilities, spatial relations, problem-solving capabilities, judgments and language. It is a more subtle form of impairment that may be more frustrating because of its subtlety. It may lead to vascular dementia and may be a result of clots.

Strokes: where is more important than how many

Not surprisingly, stroke may have a role in cognitive impairment. Stroke is also referred to as a type of vascular brain injury. But what is surprising is that in a study, results showed that the location of the stroke was more relevant than the frequency or the multitude of strokes (4). If strokes occurred in the cortical and subcortical gray matter regions of the brain, executive functioning and memory were affected, respectively. Thus, the locations of strokes may be better predictors of subsequent cognitive decline than the number of strokes. Clinically silent strokes that were found incidentally by MRI scans had no direct effect on cognition, according to the authors.

Exercise benefits cognitive functioning

Exercise may play a significant role in preventing cognitive decline and possibly even improving MCI in patients who have the disorder. Interestingly, different types of exercise have different effects on the brain. Aerobic exercise may stimulate one type of neuronal development, while resistance training or weightlifting another.

In an animal study involving rats, researchers compared aerobic exercise to weightlifting (5). Weightlifting was simulated by attaching weights to the tails of rats while they climbed ladders. Both groups showed improvements in memory tests, however, there was an interesting divergence.

With aerobic exercise, the level of the protein BDNF (brain-derived neurotrophic factor) increased significantly. This is important, because BDNF is involved in neurons and the connections among them, called synapses, related mostly to the hippocampus, or memory center. The rats that “lifted weights” had an increase in another protein, IGF (insulin growth factor), that promotes the development of neurons in a different area of the brain. The authors stressed the most important thing is to exercise, regardless of the type.

In another study that complements the previous study, women were found to have improved spatial memory when they exercised — either aerobic or weightlifting (6). Interestingly, verbal memory was improved more by aerobic exercise than by weightlifting. Spatial memory is the ability to recall where items were arranged, and verbal memory is the ability to recall words. The authors suggest that aerobic exercise and weightlifting affect different parts of the brain.

This was a randomized controlled trial that was six months in duration and involved women, ages 70 to 80, who had MCI at the trial’s start. There were three groups in the study: aerobic, weightlifting and stretching and toning. Those who did stretches or toning alone experienced deterioration in memory skills over the same period.

A Centers for Disease Control and Prevention report claims the majority of the adult population is woefully deficient in exercise: Only about 1 in 5 Americans exercise regularly, both using weights and doing aerobic exercise (7).

Diet makes a difference

Several studies show that the Mediterranean diet helps prevent MCI and possibly prevents conversion from MCI to Alzheimer’s (8, 9). In addition, a study showed that high levels of carbohydrates and sugars, when compared to lower levels, increased the risk of cognitive decline by more than three times (5). The authors surmise that carbohydrates have a negative impact on insulin and glucose utilization in the brain.

Cognitive decline should be taken very seriously, and everything that can be done to prevent it should be utilized. Exercise has potentially positive effects on neuron growth and development, and controlling carbohydrate and sugar intake may reduce risk. Of course, if you have cardiovascular disease, making lifestyle changes to reverse or minimize its impact will reap both physical and cognitive rewards. Let’s not squander the opportunity to reduce the risk of MCI, a potentially life-altering disorder.

References:

(1) Ann Intern Med. 2008;148:427-434. (2) uptodate.com. (3) JAMA Neurol. 2013;70:374-382. (4) JAMA Neurol. 2013;70:488-495. (5) J Alzheimers Dis. 2012;32:329-339. (6) J Aging Res. 2013;2013:861893. (7) Morb Mortal Wkly Rep. 2013;62:326-330. (8) Neurology 2013;80:1684-1692. (9) Arch Neurol. 2009 Feb.;66:216-225.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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Micronutrients are vitamins and minerals needed by the body in very small amounts. METRO photo
Micronutrient focus may reduce cravings

By David Dunaief, M.D.

Dr. David Dunaief

If we needed any more proof, this past year has been a good reminder that many things influence our eating behavior, including food addictions, boredom, lack of sleep and stress. This can make weight management or weight loss very difficult to achieve.

Unfortunately, awareness of a food’s caloric impact doesn’t always matter, either. Studies assessing the impact of nutrition labeling in restaurants gave us a clear view of this issue: knowing an item’s calories either doesn’t alter behavior or encourages higher calorie purchases (1, 2).

Does this mean we are doomed to acquiesce to temptation? Actually, no: It is not solely about willpower. Changing diet composition is more important.

How can we alter the dynamic? In my clinical experience, increasing the quality of food has a tremendous impact. Foods that are the most micronutrient dense, such as plant-based foods, rather than those that are solely focused on macronutrient density, such as protein, carbohydrates and fats, tend to be the most satisfying. In a week to a few months, one of the first things patients notice is a significant reduction in cravings. But don’t take my word for it. Let’s look at the evidence.

Examining refined carbohydrates

Many of us know that refined carbohydrates are not beneficial. Worse, however, a randomized control trial showed refined carbohydrates may cause food addiction (3). Certain sections of the brain involved in cravings and reward are affected by high-glycemic foods, as shown by MRI scans of trial subjects.

Study participants consumed a 500-calorie shake with either a high-glycemic index or a low-glycemic index. They were blinded (unaware) as to which they were drinking. The ones who drank the high-glycemic shake had higher levels of glucose in their blood initially, followed by a significant decline in glucose levels and increased hunger four hours later. The region of the brain that is related to addiction, the nucleus accumbens, showed a spike in activity with the high-glycemic intake.

According to the authors, this effect may occur regardless of the number of calories consumed. Granted, this was a very small study, but it was well designed. High-glycemic foods include carbohydrates, such as white flour, sugar and white potatoes. The conclusion: Everyone, but especially those trying to lose weight, should avoid refined carbohydrates. Calorie composition matters.

Comparing macronutrients

We tend to focus on macronutrients when looking at diets. These include protein, carbohydrates and fats, but are these the elements that have the greatest impact on weight loss? In an RCT, when comparing different macronutrient combinations, there was very little difference among groups, nor was there much success in helping obese patients reduce their weight (4, 5). Only 15 percent of patients achieved a 10 percent reduction in weight after two years.

The four different macronutrient diet combinations involved overall calorie restriction. In addition, each combination had either high protein, high fat; average protein, high fat; high protein, low fat; or low protein, low fat. Carbohydrates ranged from low to moderate (35 percent) in the first group to high (65 percent) in the last group. This was another well-designed study, involving 811 participants with an average BMI of 33 kg/m², which is classified as obese.

Again, focusing primarily on macronutrient levels and calorie counts did very little to improve results.

Adding micronutrients

In an epidemiological study looking at National Health and Nutrition Examination Survey data, results demonstrate that those who are overweight and obese tend to be lacking in micronutrients (6). These include carotenoids, such as lutein, zeaxanthin, beta-carotene, alpha-carotene and beta-cryptoxanthin, as well as vitamin B12, folate and vitamins C, E and D.

Unfortunately, taking supplements won’t solve the problem; supplements don’t compensate for missing micronutrients. Quite the contrary, micronutrients from supplements are not the same as those from foods. With a few exceptions, such as vitamin D and potentially B12, most micronutrient levels can be raised without supplementation, by adding variety to your diet. Please ask your doctor.

Lowering cortisol levels

The good news is that once people lose weight, they may be able to continue to keep the weight off. In a prospective (forward-looking) study, results show that once obese patients lose weight, the levels of cortisol metabolite excretion decrease significantly (7).

Why is this important? Cortisol is a glucocorticoid, which means it raises the level of glucose and is involved in mediating visceral or belly fat. This type of fat has been thought to coat internal organs, such as the liver, and result in nonalcoholic fatty liver disease. Decreasing the level of cortisol metabolite may also result in a lower propensity toward insulin resistance and may decrease the risk of cardiovascular mortality. This is an encouraging preliminary, yet small, study involving women.

Controlling or losing weight is not solely about willpower or calorie-counting. While calories have an impact, the nutrient density of the food may be more important. Thus, those foods high in a variety of micronutrients may also play a significant role in reducing cravings, ultimately helping to manage weight.

References:

(1) Am J Pub Health 2013 Sep 1;103(9):1604-1609. (2) Am J Prev Med.2011 Oct;41(4):434–438. (3) Am J Clin Nutr Online 2013;Jun 26. (4) N Engl J Med 2009 Feb 26;360:859. (5) N Engl J Med 2009 Feb 26;360:923. (6) Medscape General Medicine. 2006;8(4):59. (7) Clin Endocrinol.2013;78(5):700-705.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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Yoga can improve balance and strength, which are risk factors for falls. METRO photo
Fear of falling can lead to greater risk

By David Dunaief, M.D.

Dr. David Dunaief

Earlier in life, falls usually do not result in significant consequences. However, once we reach middle age, falls become more substantial. Even without icy steps and walkways, falls can be a serious concern for older patients, where consequences can be devastating. They can include brain injuries, hip fractures, a decrease in functional ability and a decline in physical and social activities (1). Ultimately, a fall can lead to loss of independence (2).

Contributors to fall risk

Many factors contribute to fall risk. A personal history of falling in the recent past is the most prevalent. But there are many other significant factors, such as age and medication use. Some medications, like antihypertensive medications used to treat high blood pressure and psychotropic medications used to treat anxiety, depression and insomnia, are of particular concern. Chronic diseases can also contribute.

Circumstances that predispose us to falls also involve weakness in upper and lower body strength, decreased vision, hearing disorders and psychological issues, such as anxiety and depression (3).

Simple fall prevention tips

Of the utmost importance is exercise. But what do we mean by “exercise”? Exercises involving balance, strength, movement, flexibility and endurance all play significant roles in fall prevention (4).

Many of us in the Northeast are also low in vitamin D, which may strengthen muscle and bone. This is an easy fix with supplementation. Footwear also needs to be addressed. Nonslip shoes are crucial indoors, and outside in winter, footwear that prevents sliding on ice is a must. Inexpensive changes in the home, like securing area rugs, can also make a big difference.

Medication side-effects

There are a number of medications that may heighten fall risk. As I mentioned, psychotropic drugs top the list. But what other drugs might have an impact?

High blood pressure medications have been investigated. A propensity-matched sample study (a notch below a randomized control trial in terms of quality) showed an increase in fall risk in those who were taking high blood pressure medication (5). Those on moderate doses of blood pressure medication had the greatest risk of serious injuries from falls, a 40 percent increase.

While blood pressure medications may contribute to fall risk, they have significant benefits in reducing the risks of cardiovascular disease and events. Thus, we need to weigh the risk-benefit ratio in older patients before considering stopping a medication. When it comes to treating high blood pressure, lifestyle modifications may also play a significant role in treating this disease (6).

How exercise helps

All exercise has value. A meta-analysis of a group of 17 trials showed that exercise significantly reduced the risk of a fall (7). If the categories are broken down, exercise led to a 37 percent reduction in falls that resulted in injury and a 30 percent reduction in those falls requiring medical attention. Even more impressive was a 61 percent reduction in fracture risk.

Remember, the lower the fracture risk, the more likely you are to remain physically independent. Thus, the author summarized that exercise not only helps to prevent falls but also fall injuries.

Unfortunately, those who have fallen before, even without injury, often develop a fear that causes them to limit their activities. This leads to a dangerous cycle of reduced balance and increased gait disorders, ultimately resulting in an increased risk of falling (8).

What types of exercise?

Tai chi, yoga and aquatic exercise have been shown to have benefits in preventing falls and injuries from falls.

A randomized controlled trial showed that those who did an aquatic exercise program had a significant improvement in the risk of falls (9). The aim of the aquatic exercise was to improve balance, strength and mobility. Results showed a reduction in the number of falls from a mean of 2.00 to a fraction of this level — a mean of 0.29. There was also a 44 percent decline in the number of exercising patients who fell during the six-month trial, with no change in the control group.

If you don’t have a pool available, Tai Chi, which requires no equipment, was also shown to reduce both fall risk and fear of falling in older adults in a randomized control trial of 60 male and female participants (10).

Another pilot study used modified chair yoga classes with a small assisted living population (11). Participants were those over 65 who had experienced a recent fall and had a resulting fear of falling. While the intention was to assess exercise safety, researchers found that participants had less reliance on assistive devices and three of the 16 participants were able to eliminate their use of mobility assistance devices.

Thus, our best line of defense against fall risk is prevention. Does this mean stopping medications? Not necessarily. But for those 65 and older, or for those who have arthritis and are at least 45 years old, it may mean reviewing your medication list with your doctor. Before considering changing your blood pressure medications, review the risk-to-benefit ratio with your physician.

References:

(1) MMWR. 2014; 63(17):379-383. (2) J Gerontol A Biol Sci Med Sci. 1998;53(2):M112. (3) JAMA. 1995;273(17):1348. (4) Cochrane Database Syst Rev. 2012;9:CD007146. (5) JAMA Intern Med. 2014 Apr;174(4):588-595. (6) JAMA Intern Med. 2014;174(4):577-587. (7) BMJ. 2013;347:f6234. (8) Age Ageing. 1997 May;26(3):189-193. (9) Menopause. 2013;20(10):1012-1019. (10) Mater Sociomed. 2018 Mar; 30(1): 38–42. (11) Int J Yoga. 2012 Jul-Dec; 5(2): 146–150.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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Stock photo

Building heart-healthy habits improves the likelihood we’ll be around for those we love

By David Dunaief, M.D.

Dr. David Dunaief

This February, we celebrate both Valentine’s Day, an opportunity to celebrate those we love, as well as American Heart Month, a chance for us to build awareness of heart-healthy habits.

The good news is that heart disease is on the decline due to a number of factors, including better awareness in lay and medical communities, improved medicines, earlier treatment of risk factors and lifestyle modifications. We are headed in the right direction, but we can do better. Heart disease is something that is eminently preventable.

Reducing our risks

Risk factors for heart disease include obesity, high cholesterol, high blood pressure, smoking and diabetes. Unfortunately, both obesity and diabetes are on the rise. For patients with type 2 diabetes, 70 percent die of cardiovascular causes (1). However, high blood pressure, high cholesterol and smoking have declined (2).

Inactivity and the standard American diet, rich in saturated fat and calories, also contribute to heart disease risk (3). The underlying culprit is atherosclerosis, fatty streaks in the arteries.

Another potential risk factor is a resting heart rate greater than 80 beats per minute (bpm). In one study, healthy men and women had 18 and 10 percent increased risks of dying from a heart attack, respectively, for every increase of 10 bpm over 80 (4). A normal resting heart rate is usually between 60 and 100 bpm. Thus, you don’t have to have a racing heart rate, just one that is high-normal. All of these risk factors can be overcome.

When medication helps reduce risk

Cholesterol and blood pressure medications have been credited to some extent with reducing the risk of heart disease. The compliance with blood pressure medications has increased over the last 10 years from 33 to 50 percent, according to the American Society of Hypertension.

In terms of lipids, statins have played a key role in primary prevention. Statins are effective at not only lowering lipid levels, including total cholesterol and LDL — the “bad” cholesterol — but also inflammation levels that contribute to the risk of cardiovascular disease. The Jupiter trial showed a 55 percent combined reduction in heart disease, stroke and mortality from cardiovascular disease in healthy patients — those with a slightly elevated level of inflammation and normal cholesterol profile — with statins.

The downside of statins is their side effects. Statins have been shown to increase the risk of diabetes in intensive dosing, compared to moderate dosing (5).

Unfortunately, many on statins also suffer from myopathy (muscle pain). I have had a number of patients who have complained of muscle pain and cramps. Their goal when they come to see me is to reduce and ultimately discontinue their statins by following a lifestyle modification plan involving diet and exercise. Lifestyle modification is a powerful ally.

Making lifestyle changes

The Baltimore Longitudinal Study of Aging, a prospective (forward-looking) study, investigated 501 healthy men and their risk of dying from cardiovascular disease. The authors concluded that those who consumed five servings or more of fruits and vegetables daily with <12 percent saturated fat had a 76 percent reduction in their risk of dying from heart disease compared to those who did not (6). The authors theorized that eating more fruits and vegetables helped to displace saturated fats from the diet. These results are impressive and, to achieve them, they only required a modest change in diet.

The Nurses’ Health Study shows that these results are also seen in women, with lifestyle modification reducing the risk of sudden cardiac death (SCD). Many times, this is the first manifestation of heart disease in women. The authors looked at four parameters of lifestyle modification, including a Mediterranean-type diet, exercise, smoking and body mass index. There was a decrease in SCD that was dose-dependent, meaning the more factors incorporated, the greater the risk reduction. There was as much as a 92 percent decrease in SCD risk when all four parameters were followed (7). Thus, it is possible to almost eliminate the risk of SCD for women with lifestyle modifications.

Monitoring your risk of heart disease

To determine your progress, we use cardiac biomarkers, including inflammatory markers like C-reactive protein, blood pressure, cholesterol and body mass index. 

In a cohort study of high-risk participants and those with heart disease, patients implemented extensive lifestyle modification: a plant-based, whole foods diet accompanied by exercise and stress management. The results showed an improvement in biomarkers, as well as in cognitive function and overall quality of life. The best part is the results occurred over a very short period to time — three months from the start of the trial (8). Many patients I have seen have had similar results.

Ideally, if patient needs to use medications to treat risk factors for heart disease, it should be for the short term. For some patients, it may be appropriate to use medication and lifestyle changes together; for others, lifestyle modifications may be sufficient, as long as patients take an active role.

By focusing on developing heart-healthy habits, we can improve the likelihood that we – and those we love – will be around for a long time.

References:

(1) Diabetes Care. 2010 Feb; 33(2):442-449. (2) JAMA. 2005;293(15):1868. (3) Lancet. 2004;364(9438):93. (4) J Epidemiol Community Health. 2010 Feb;64(2):175-181. (5) JAMA. 2011;305(24):2556-2564. (6) J Nutr. March 1, 2005;135(3):556-561. (7) JAMA. 2011 Jul 6;306(1):62-69. (8) Am J Cardiol. 2011;108(4):498-507.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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What your microbiome really needs is fiber. Stock photo
Studies show significant short-term changes to the microbiome when eating fruits, vegetables and plant fiber

By David Dunaief, M.D.

Dr. David Dunaief

Considering our recent focus on cleansing germs from every surface, it’s a leap to acknowledge that we harbor a multitude of microorganisms, or microbes, in our bodies. We have so many, over one trillion microorganisms, that they outnumber our cells by a 10-to-1 ratio, even in healthy individuals.

These make up what we call the microbiome. It includes bacteria, viruses and single-cell eukaryotes. Our relationship to these organisms is complex, spanning from parasitic to commensalistic (one benefits and the other is not affected) to mutualistic (both benefit). While the microbiome is found throughout our bodies, including the skin, the eyes and the gut, we’re going to focus on the gut, where the majority of the microbiome resides.

Why do we care about the gut microbiome? 

The short answer is it may have a role in diseases — preventing and promoting them. These include obesity, diabetes, irritable bowel syndrome, autoimmune diseases, such as rheumatoid arthritis and Crohn’s, and infectious diseases, such as colitis. Like the Human Genome Project, which mapped our genes, there is a Human Microbiome Project, launched by the National Institutes of Health in 2007, to map out the composition and diversity of these gut organisms. We are still in the early stages of understanding this vast universe of microbes, yet there have been some preliminary studies.

What affects the microbiome? 

Drugs, such as antibiotics, can wipe out the diversity in the microbes, at least in the short term. Also, lifestyle modifications, such as diet, can have an impact. Microbiome diversity also may be significantly different in distinct geographic locations throughout the world. Let’s look at the evidence.

Using twins to study obesity

Obesity can be one of the most frustrating disorders; most obese patients continually struggle to lose weight. Obese and overweight patients now outnumber malnourished individuals worldwide (1). 

I know this will not come as a surprise, but we are a nation with a weight problem; about 70% of Americans are overweight or obese (2) (3). For the longest time, the paradigm for weight loss had been that if you ate fewer calories, you would lose weight. However, extreme low-caloric diets did not seem to have a long-term impact. It turns out that our guts, dominated by bacteria, may play important roles in obesity and weight loss, determining whether we gain or lose weight. Let’s look at the data on obesity.

The results from a study involving human twins and mice are fascinating (4). In each pair of human twins, one was obese and the other was lean. Gut bacteria from obese twins was transplanted into thin mice. The result: the thin mice became obese. However, when the lean human twins’ gut bacteria were transplanted to thin mice, the mice remained thin.

By pairing sets of human twins, one obese and one thin in each set, with mice that were identical to each other and raised in a sterile setting, researchers limited the confounding effects of environment and genetics on weight.

The most intriguing part of the study compared the effects of diet and gut bacteria. When the mice who had received gut transplants from obese twins were provided gut bacteria from thin twins and given fruit- and vegetable-rich, low-fat diet tablets, they lost significant weight. But they only lost weight when on a good diet; there was no impact if the diet was not low in fat. The authors believe this suggests that an effective diet may alter the microbiome of obese patients, helping them lose weight. These are exciting, but preliminary, results. It is not clear yet which bacteria may be contributing these effects.

This definitely suggests that the diversity of gut bacteria may be a crucial piece of the weight-loss puzzle.

Do gut bacteria influence rheumatoid arthritis development?

Rheumatoid arthritis (RA) is an autoimmune disease that can be disabling, with patients typically suffering from significant morning stiffness, joint soreness and joint breakdown. What if gut bacteria influenced RA risk? In a study, the gut bacteria in mice that were made susceptible to RA by deletion of certain genes (HLA-DR genes) were compared to those who were more resistant to developing RA (5). Researchers found that the RA-susceptible mice had a predominance of Clostridium bacteria and that those resistant to RA were dominated by bacteria such as bifidobacteria and Porphyromonadaceae species. The significance is that the bacteria in the RA-resistant mice are known for their anti-inflammatory effects.

Although nobody can say what the ideal gut bacteria should consist of, and the research is still evolving when it comes to the microbiome, there are potential ways of influencing this milieu, especially in our gut. Diet and other lifestyle considerations, such as eating and sleeping patterns or their disruptions, seem to be important to the composition and diversity of gut bacteria (6). Studies have already demonstrated prebiotic effects of fiber and significant short-term changes to the microbiome when eating fruits, vegetables and plant fiber. The research is continuing, but we’ve learned a lot already that may help us tackle obesity, inflammatory bowel syndrome and autoimmune disorders.

References:

(1) “The Evolution of Obesity”; Johns Hopkins University Press; 2009. (2) cdc.gov (3) nih.gov (4) Science. 2013;341:1241214. (5) PLoS One. 2012;7:e36095. (6) Nutrients. 2019 Dec;11(12):2862.

Dr. David Dunaief is a speaker, author and local lifestyle medicine physician focusing on the integration of medicine, nutrition, fitness and stress management. For further information, visit www.medicalcompassmd.com. 

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