Diets high in fish, fruits and vegetables are high in anti-oxidants and polyunsaturated fatty acids (PUFAs). In some observational population-based studies, people who had a high intake of vitamins E and C (both anti-oxidants) were less likely to show cognitive decline and had a lower Alzheimer's risk than individuals with a low intake of these vitamins. Another reason to take a good multiple vitamin with antioxidants.
Mediterranean-type diet which is a diet characterized by a high intake of plant foods and fish (with olive oil as the primary source of monounsaturated fat), a moderate intake of wine and a low intake of red meat and poultry reduced the incidence of Alzheimer's. In a meta-analysis of 15 prospective studies exploring the effect of alcohol on dementia risk,[light to moderate alcohol consumption was associated with a reduction in the risk of Alzheimer's and dementia.