To reduce your risk of dying of Alzheimer's, do three simple things: run more than fifteen miles per week, take a statin to control cholesterol levels, and eat three or more pieces of fruit daily. If you're not a runner, don't worry--you can also walk, as long as you expend as much energy as you would if you had run fifteen miles. A 165-pound person burns about 96 calories per mile walked, versus 135 per mile run. Basically, it's time to get rid of the car.