Gluten-Free Everything
Credit: Getty Images

Although some people need to avoid gluten for medical reasons, many others cut out foods containing this protein because they think "gluten-free" means healthy. It doesn't. "Usually when people go gluten-free just to manage their weight, it backfires," Salge Blake says. "Many gluten-free foods, especially sweet stuff like cookies, have the same number of calories as their gluten-containing equivalents, if not more. These foods are also more expensive, so if you don't really need to avoid gluten, it doesn't make sense to buy them."