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St. Joseph's Hospital and Medical Center



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Patricio Reyes M.D.
Director, Traumatic Brain Injury, Alzheimer's Disease & Cognitive Disorders Clinics; Phoenix, AZ; Chief Medical Officer, Retired NFL Players Association

Barrow Neurological Institute

St. Joseph's Hospital and Medical Center
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Saturday, April 8, 2017

 

To Help Ward Off Alzheimer’s, Think Before You Eat




























Diets designed to boost brain health, targeted largely at older adults, are a new, noteworthy development in the field of nutrition.

The latest version is the Canadian Brain Health Food Guide, created by scientists in Toronto. Another, the MIND diet, comes from experts at Rush University Medical Center in Chicago and Harvard T.H. Chan School of Public Health.

Both diets draw from a growing body of research suggesting that certain nutrients — mostly found in plant-based foods, whole grains, beans, nuts, vegetable oils and fish — help protect cells in the brain while fighting harmful inflammation and oxidation.

Both have yielded preliminary, promising results in observational studies. The Canadian version — similar to the Mediterranean diet but adapted to Western eating habits — is associated with a 36 percent reduction in the risk of developing Alzheimer’s disease. The MIND diet — a hybrid of the Mediterranean diet and the DASH diet (Dietary Approaches to Stop Hypertension) — lowered the risk of Alzheimer’s by 53 percent.


Researchers responsible for both regimens will study them further in rigorous clinical trials being launched this year.

Still, the diets differ in several respects, reflecting varying interpretations of research regarding nutrition’s impact on the aging brain.

A few examples: The MIND diet recommends two servings of vegetables every day; the Canadian diet recommends five. The Canadian diet suggests that fish or seafood be eaten three times a week; the MIND diet says once is enough.

The MIND diet calls for at least three servings of whole grains a day; the Canadian diet doesn’t make a specific recommendation. The Canadian diet calls for four servings of fruit each day; the MIND diet says that five half-cup portions of berries a week is all that is needed.

We asked Carol Greenwood, a professor of nutrition at the University of Toronto and a key force behind the Canadian diet, and Martha Clare Morris, a nutritional epidemiologist at Rush University Medical Center and originator of the MIND diet, to elaborate on research findings about nutrition and aging and their implications for older adults.

Nutrition And The Brain

It’s not yet well understood precisely how nutrition affects the brains of older adults. Most studies done to date have been in animals or younger adults.

What is clear: A poor diet can increase the risk of developing hypertension, cardiovascular disease, obesity and diabetes, which in turn can end up compromising an individual’s cognitive function. The corollary: A good diet that reduces the risk of chronic illness is beneficial to the brain.

Also, what people eat appears to have an effect on brain cells and how they function.

“I don’t think we know enough yet to say that nutrients in themselves support neurogenesis (the growth of neurons) and synaptogenesis (the growth of neural connections),” Greenwood said. “But pathways that are needed for these processes can be supported or impaired by someone’s nutritional status.”

Essential Nutrients

“Several nutrients have been shown to have biological mechanisms related to neuropathology in the brain,” Morris said.

On that list is Vitamin E, a powerful antioxidant found in oils, nuts, seeds, whole grains and leafy green vegetables, which is associated with slower cognitive decline, a lower risk of dementia, and reduced accumulation of beta-amyloid proteins — a key culprit in Alzheimer’s disease.

“The brain is a site of great metabolic activity,” Morris said. “It uses an enormous amount of energy and in doing so generates a high level of free radical molecules, which are unstable and destructive. Vitamin E snatches up those free radicals and protects the brain from injury.”


Also on her list is vitamin B12 — found in animal products such as meat, eggs, cheese and fish — and vitamin B9 (folate), found in green leafy vegetables, grains, nuts and beans.

Because aging affects stomach acids that facilitate the absorption of B12, “everyone who gets to middle age should have a doctor check their B12 levels,” Morris said. A deficiency of this vitamin can lead to confusion and memory problems, while folate deficiency is associated with cognitive decline and an increased risk of dementia.

Omega-3 fatty acids found in fish and nuts oils, especially DHA (docosahexaenoic acid), are highly concentrated in the brain, where they are incorporated in cell membranes and play a role in the transmission of signals between cells.

“A primary focus has to be maintaining healthy” blood vessels in the brain, Greenwood said. “So, heart health recommendations are similar in many ways to brain health recommendations, with this exception: The brain has higher levels of Omega-3s than any other tissue in the body, making adequate levels even more essential.”

Other studies point to calcium, zinc and vitamins A, C and D as having a positive impact on the brain, though findings are sometimes inconsistent.

Foods To Avoid

For the most part, the Canadian and MIND diets concur on foods to be avoided or limited to once-a-week servings, especially saturated fats found in pastries, sweets, butter, red meat and fried and processed foods.

As for dairy products, “there’s no evidence one way or another. If you like your yogurt, keep eating it,” Morris said. Greenwood adds a caveat: Make sure you consume low-fat dairy products as opposed to whole-fat versions.

Other Helpful Diets

Randomized clinical trials have demonstrated that both the Mediterranean diet and the DASH diet have a positive impact on various aspects of cognition, although neither was created specifically for that purpose.

“At the end of the day, our [Canadian] diet, the MIND diet, the Mediterranean diet and the DASH diet are not that different; they’re all likely to be helpful,” Greenwood said.

Story Source: The above story is based on materials provided by KAISERHEALTHNEWS
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