There's no magic bullet for weight loss. For example, you may have heard that grapefruit "burns" fat, right? Wrong. No food can do that. But if you eat grapefruit as a snack instead of chips or a candy bar, that can help you lose weight. Among other things, it's a good source of vitamins A and C. But be careful if you are taking any medication. Grapefruit can interact with certain drugs. Ask your doctor or pharmacist if there are any interactions that you have to be careful of.