Working out regularly, watching your blood pressure, and stimulating your brain with new challenges have all been shown to reduce the risk for Alzheimer's. New research suggests that keeping your cholesterol in check could also defend against the disease. In a study of 9,700 men and women, scientists found that those with the highest total cholesterol levels in their 40's were more like to develop Alzheimer's later in life.
Also, try to follow a diet rich in fruits, vegetables and foods high in fiber and omega-3s.