What should i do to maintain a better health?

Many things: Eat right, exercise, keep lean, don't use tobacco or alcohol in excess, stay off of recreational drugs, have a sense of humor, sleep well, wear seat belts, made friends, be honest, study hard, love passionately, don't eat barbq if you have paper cuts on your fingers, don't play leap frog with a unicorn.

Good Nutrition: Plenty of fresh fruits and vegetables and moderate amounts of lean meat. I try to eat 5-6 small meals a day. This keeps your digestive tract working constantly and you never overload your system which can make you sluggish. Drink plenty of water everyday, at least 8 glasses. Moderate amounts of exercise daily. Try to get 6-8 hours of sleep every night. Limited alcohol, coffee, and sugar.