Drink lots of water. Eight 8-ounce glasses a day. It really makes a difference. Don't skip breakfast. You have to feed your brain if you expect to think great thoughts.
Variety is more than the spice of life.
It's the best way to get plenty of vitamins and minerals in your diet. Eat five servings of fruits and vegetables a day. It's not that hard if you eat fruit with breakfast and a salad at lunch. Wash your hands before you cook, while you're cooking and before you eat.