Currently, no medicines or treatments are known to prevent Alzheimers disease, but scientists are studying many possibilities. These possibilities include lifestyle factors such as exercise and physical activity, a healthy diet, and mentally stimulating activities. In addition to lifestyle factors, scientists have found clues that some long-term health conditions, like heart disease, high blood pressure, and diabetes, are related to Alzheimers disease. Its possible that controlling these conditions will reduce the risk of developing Alzheimers. 
How to prevent Alzheimers Disease ?