To effectively check the build up of fat in your body, you need to watch what you eat. While some foods help you stay trim and fit or even burn fat, others help you accumulate more of it. Here are some tips to help you eat right and avoid fat in your body tissues. 1. Substitute fruit purees for butter or margarine. They are easy to prepare in a food processor and will significantly reduce calories and fat. 2. Cheese is good for you, but the fat is not. Try this: Zap cheese in the microwave and drain off grease. 3. Exercising before you eat just makes you hungrier. Exercise AFTER eating when the body has to work harder to digest food. 4. ...