Can Diet Prevent Alzheimer's Disease?

Experts are studying how diet may affect the onset and progression of Alzheimer's disease. Learn the latest research into this memory-robbing disease.

Little in life is as scary as the idea of forgetting our loved ones, our histories, and ourselves. Yet that is exactly what is happening to the more than 5 million people in North America suffering from Alzheimer’s disease.

Mild forgetfulness in the early years of the disease slowly expands to include serious problems with memory, language, and abstract reasoning until eventually this brain disorder robs its victims of the ability to function.

Despite extensive research, both cause and cure for Alzheimer’s disease remain elusive. Experts theorize that a complicated combination of genetic, environmental, and lifestyle factors result in cognitive decline, though they are still working on exactly how it happens and what can be done to prevent it.

One logical area of exploration is diet. While there have been no definitive breakthroughs yet, there are certain foods that are being carefully studied for their specific relationship to Alzheimer's.

Diet and Alzheimer’s Disease: Omega-3 Fatty Acids and B Vitamins

“A few studies found a correlation between high dietary fish with omega-3 fatty acid intake and a decrease in developing Alzheimer’s,” says Tara Harwood, registered dietitian at the Cleveland Clinic in Ohio. “However, more studies must be conducted before any conclusions can be drawn.”

High levels of homocysteine, an amino acid in the blood, have been associated with the risk of dementia. One avenue being examined is whether increasing intake of folate and vitamins B6 and B12, which break down homocysteine, can help prevent Alzheimer’s disease. “Neither vitamin B6 or B12 supplementation has been proven effective,” says Harwood, “but data from one study found a lower incidence of Alzheimer’s for individuals with the highest folate intake.”

Diet and Alzheimer’s Disease: Antioxidants

Another possible theory in the development of Alzheimer’s disease involves free radicals destroying the integrity of the body’s cells. These unstable molecules have the potential to cause cell aging and damage, which could be one piece of the Alzheimer’s puzzle.

“You can reduce your exposure to free radicals by limiting contact with the sun, environmental pollutants, and cigarette smoke,” says Harwood. “However, free radicals are a byproduct of metabolism, which occurs every minute of the day. Because it’s impossible to completely eliminate free radicals, [eating foods with] antioxidants, such as vitamin E, vitamin C, beta carotene, and flavonoids, can help.”

Foods high in antioxidants include berries, dark green and orange vegetables, nuts, and beans. Specifically, studies have shown rats and mice bred to develop Alzheimer’s disease had improved mental function after being fed blueberries, strawberries, and cranberries. Green tea is also high in antioxidants, and although it hasn’t been proven specifically to prevent Alzheimer’s, it has been shown that drinking five cups a day can reduce one’s risk of heart disease.

Diet and Alzheimer’s Disease: The Mediterranean Diet

A few recent studies conducted by researchers from the neurology department at Columbia University Medical Center in New York have looked at the possible preventive effects of the typical diet eaten by people in countries around the Mediterranean sea, such as Greece. The “Mediterranean diet” is primarily made up of fruits, vegetables, and beans, fish, olive oil, a moderate amount of wine, some dairy foods, and small amounts of meat and chicken. Though more study is needed, results point to a reduced risk of developing Alzheimer’s and lower mortality rate among those who contracted the disease.

Diet and Alzheimer’s Disease: Next Steps

While there is no definitive answer to the Alzheimer’s mystery, there are certainly clues to follow. “No changes in diet, dietary supplements, food additives, vitamins, nor alternative herbal medicines have ever been demonstrated to affect the risk for Alzheimer’s disease or the course of the disease in a well-designed clinical trial experiment,” says Randolph Schiffer, MD, director of the Cleveland Clinic Lou Ruvo Center for Brain Health in Cleveland. “With that said, most of us in the Alzheimer’s research field believe that people should adopt and continue healthy lifestyles, including diets low in saturated fats and high in antioxidants and B vitamins.”

Until more research is available, it makes sense to combine a good diet with physical and mental activity and social interaction. This approach just might help keep Alzheimer’s disease, as well as other illnesses, at bay.

By Kristen Stewart | Medically reviewed by Pat F. Bass III, MD, MPH

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Say No to Soda, Yes to Healthy Drinks

Sodas are sweet, sparkling and tasty — but don't confuse them with a healthy drink. Doctors have discovered a ton of health risks connected with drinking soda pop. Worse, you're robbing yourself of a healthy drink alternative brimming with needed vitamins and minerals every time you chug down a soft drink.

"If you're choosing a soda, chances are you aren't choosing a healthy beverage," says Keri M. Gans, a nutrition consultant in New York City and a spokeswoman for the American Dietetic Association. There are a number of healthy drink choices you can make instead.

Why Say No to Soda?

Soda is truly worthless to your body. "In my opinion, there's really one major reason to not drink soda," Gans says. "It has absolutely no nutritional value. Soda is filled with sugar and calories and nothing else." Even diet sodas — low to no calories and sugar — don’t have any redeeming virtues, nutritionally. Healthy drinks, on the other hand, have vitamins and minerals the body can use. Even plain water can rehydrate your body without adding extra calories to your diet.

Sugary sodas contribute to obesity and diabetes. Soda is loaded with high-fructose corn syrup, a sweetener that has been linked to obesity. Soda consumption also has been linked to the development of type 2 diabetes, both due to its sugar content and its effects on the body's hormones. And diet soda? It may not be any better. At least one study has linked artificial sweeteners, such as those used in diet sodas, to increased appetite, greater difficulty losing weight, and a harder time maintaining weight loss.

Soda damages your teeth. The sugar in soda coats your teeth, combining with bacteria in your mouth to form acid. Both regular and diet soda also contain carbolic acid through carbonation. These acids work to weaken tooth enamel, causing cavities and tooth decay.

Drinking soda can weaken your bones. Most sodas contain phosphorous and caffeine, agents that are believed to contribute to osteoporosis. Experts also worry that people consume soda in place of milk or other healthy drinks, depriving the bones of calcium.

Soda can harm your major organs. Research has demonstrated that increased soft drink consumption may be linked to chronic kidney disease, development of metabolic syndrome (a group of symptoms that add up to increased heart risk), and fatty liver, a chronic liver disease.

Healthy Drink Alternatives

Luckily, there are limitless options when choosing a healthy drink over a soda pop. Some soda alternatives include:

Water. It is the ultimate healthy drink. "It's free in every sense of the word," Gans says. "It has no calories and it comes straight from your tap."

Fruit juice. Gans urges you not to drink straight fruit juice, which contains a lot of sugar. "Drink some seltzer with a splash of juice for a little flavoring," she says. "Rather than drinking juice, eat a piece of whole fruit. You're also getting the fiber in the fruit."

Milk. This is another essential healthy drink, particularly for kids. "An 8-ounce glass of nonfat milk has 80 calories and nine essential nutrients," Gans says. "You get a lot of bang for your buck."

Tea. Whatever teas you prefer — green, black, herbal — they all have been shown to contain high levels of antioxidants, which are believed to protect the body from damage.

Powdered drink mixes. They contain no tooth-rotting carbonation, and come in sugar-free varieties. They give your sweet tooth a fix without harming your overall nutrition.

And remember that you can always cut up some fresh fruit and pop a little into a tall glass of water for an extra flavor kick. Choosing healthy drinks over soda: Give it a try. Your body will thank you.

By Dennis Thompson Jr. | Medically reviewed by Pat F. Bass III, MD, MPH

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