1. The food you eat will make a difference if you want to keep _______ (健康的).
2. If you eat too much every day, you will put on w_______.            
3. The medicine had a good e_______ on her and soon she felt better.
4. His uncle is an _______ (专家) in heart disease.
5. Good health r_______ enough exercise and a balanced (均衡的) diet.