"Diet" Foods Can Help You Lose Weight A lot of junk food is marketed as healthy. Examples include low-fat foods, fat-free foods, processed gluten-free foods and disguised high-sugar beverages like Vitaminwater. However, you really can NOT trust these foods. The labels and health claims are usually put there to deceive, not inform. Some junk food marketers are really immoral. They will lie to you to get you to buy super harmful, fattening junk food for you and your children. A good rule of thumb: If the packaging of a food tells you that it is healthy, then it's probably bad for you.