Fat-free does NOT mean calorie-free. Just because a food contains no fat, that doesn't make it a health food. (Think gummy bears.) Of course, there are many very healthful fat-free foods (like most fruits and vegetables), but always check the nutrition labels when buying packaged foods to be sure you're getting a nutritious product and not just one that's fat-free. Calories, sodium, fiber, and vitamins and minerals are all aspects you should consider in addition to fat.