ΚΑΙ Η ΦΛΕΓΜΟΝΗ ΣΤΟΝ ΕΓΚΕΦΑΛΟ
Even our grand mother told us that.. fish was "brainfood"..and now scientists have yet more evidence to back the claim.
Researchers with the Department of Veterans Affairs and the University of California, Los Angeles, found that a diet high in docosahexenoic acid, or DHA-one of the omega-3 fatty acids in cold-water fish-dramatically slowed the progression of Alzheimer's disease in mice.Specifically, DHA cut the harmful brain plaques that mark the disease.
Senior author Greg M. Cole, PhD, a neuroscientist at the Greater Los Angeles VA Healthcare System and UCLA, said that unlike many studies with mice, this one points to the benefits of a therapy that is easily available and already touted for other medical conditions.DHA-either from food sources such as fish or certain nuts, or in fish-oil- or algae-based supplements-is recommended by many cardiologists for heart health, based on scores of studies."You can buy this therapy at your supermarket or drug store," said Cole."DHA has a tremendous safety profile-essentially no side effects-and clinical trial evidence supports giving DHA supplements to people at risk for cardiovascular disease."
The new study involved older mice genetically altered to develop Alzheimer's disease. The researchers fed one group of the mice DHA-fortified chow. The other mice ate a normal or DHA-depleted diet. After three to five months-the equivalent of several years in human biology-the high-DHA group had 70-percent less buildup of amyloid protein in the brain. This sticky protein makes up the plaques, or patches, that are a hallmark of Alzheimer's.A similar study by Cole's group published in Neuron last fall showed that DHA protected against damage to the "synaptic" areas where brain cells communicate and enabled mice to perform better on memory tests.The studies, say the scientists, suggest that even people who are genetically predisposed to the disease may be able to delay itby boosting their DHA intake.
Omega-3 fatty acids, typically deficient in the American diet,
are essential for human health.
DHA in particular is vital to proper brain function,as well as eye health and other body processes. In recent years epidemiologists have tied fish-rich diets to a lower incidence of Alzheimer's disease and homed in on DHA as the preventive factor.Omega-3 fatty acid supplements are now being tested in clinical trials with early-stage Alzheimer's patients in the United States, Canada and Sweden to see if the therapy really slows the disease.
Food sources of omega-3 fatty acids include fish such as salmon, halibut, mackerel and sardines, as well as almonds, walnuts and DHA-enriched eggs. Concerns about mercury in fish have helped popularize purified DHA supplements based on fish oil or algae.Cole's team last year identified another nutrient that appears to combat Alzheimer's plaques in mice: curcumin, the yellow pigment in turmeric, one of the spices that make up curry powder. Researchers became interested in curcumin's potential to prevent or treat Alzheimer's disease after noting the low prevalence of dementia among the elderly in India, where curry is a staple.
Cole is the associate director for research at VA's Los Angeles-based Geriatric Research,
Education and Clinical Center, and a professor of medicine and neurology at UCLA.
Lead author for the new study was Giselle P. Lim, PhD, a UCLA postgraduate
researcher in Cole's group. Working with them were colleagues from VA,
UCLA and the National Institutes of Health. The study was supported
by the National Institute on Aging, VA, the Alzheimer's Association,
and the Canadian Institutes of Health Research.