Persons most commonly affected: All age groups and both sexes.

Organ or part of body involved: Brain

Prevention: Physical exercise can increase mental abilities 20% to 30 %. Eating a diet rich in fruits and vegetables. Many of these contain antioxidants -- substances that protect and nourish brain cells. And antioxidants may help prevent cholesterol from damaging the lining of your arteries and slowing blood flow to your brain. Foods high in antioxidants include colorful fruits and vegetables, such as oranges, berries, broccoli, spinach, carrots, sweet potatoes and tomatoes. Avoid alcohol, stress, and smoking.