Diet A preliminary analysis of dietary habits in eleven countries suggests that a low-fat diet might reduce the risk of Alzheimer's. A study in the Netherlands reported an association between dementia and diets high in total fat, saturated fat, and cholesterol. Some fats, however, such as omega-3 fatty acids, which are found in fish such as salmon, halibut, swordfish, and tuna are essential for the development of nervous system. These fatty acids also may help protect against mental decline in old age. Some reports have suggested that certain dietary antioxidants, such as vitamin C, E, and selenium may be protective against mental decline.
Vitamin E is of particular interest.
It should be pointed out, however, that in patients with existing Alzheimer's weight loss is a strong indicator of mental decline. A number of studies have reported a higher risk for Alzheimer's disease in people with less education and a lower risk for dementia and Alzheimer's in those who remain mentally active. A few experts speculate that learning itself stimulates more neurons to grow and thus may create a larger reserve in the brain so that it takes longer for brain cells to be destroyed. Others believe that socioeconomic forces, such as diet and environmental toxins, may make less educated people more susceptible. An ongoing study of nuns found no association between education and Alzheimer's, but did find a high risk for Alzheimer' s among those whose youthful writings showed a paucity of ideas and a low risk in those whose writings were idea-rich.