by Ysabel J. Doran Before you throw that jar of fat-free mayo or those fat-free muffins in your shopping cart, thinking they'll help you lose weight, consider this -- fat does not make you fat. It sounds like a paradox, but in fact, it makes perfect sense. Fat on your body does not come from the fat that you eat. It comes from calories you consume in excess of what you use up with activity. {relatedarticles} All ...