Try to follow this tips :

Consume vitamins E and C
Some vitamins are recommended for preventing Alzheimer’s disease. This applies, for example, vitamins E and C! According to two studies published in 2002 in the Journal of American Medical Association (JAMA), their antioxidant properties would promote the prevention of this disease. The recommended intake of vitamin E is 12 mg per day and for vitamin C of 110 mg per day.
- Foods rich in vitamin E are vegetable oils, cereals, nuts (walnuts, almonds, etc..), Sweet potatoes, mangoes.
- Foods rich in vitamin C are blackcurrant, pepper, lemon, cauliflower, melon, orange.

Vitamin B
A recent Swedish study, vitamins B12 and B9 (folate) would prevent Alzheimer’s disease. For proof, among 370 people aged over 75 years and followed for three years by researchers, 78 have developed a form of senile dementia, including Alzheimer’s disease. However, these 78 participants, 46 had a deficiency in vitamin B12 or B9. The explanation? The deficit in these two vitamins enhance neuronal death, a phenomenon strongly implicated in Alzheimer’s disease.
- Foods rich in vitamins B12 and B9 are: bananas, vegetables, broccoli and legumes (beans, peas, chickpeas).

Eat fish
According to a U.S. study, a diet rich in omega-3 would reduce by 47% the risk of developing Alzheimer’s disease. There is also a good way to prevent cardiovascular disease. The omega-3 are particularly present in salmon, sardines, mackerel and tuna. Fish oil, less rich, is also a good source of omega-3.
For best results, it is advisable to consume at least two servings of fish per week.