Fiber

Fiber's few calories are more than offset by its weight-control benefits. The conclusion of a review published in the journal Nutrition is clear: People who add fiber to their diets lose more weight than those who don't. Fiber requires extra chewing and slows the absorption of nutrients in your gut, so your body is tricked into thinking you have enough, says review author Joanne Slavin, PH.D., R.,D. Some fibers may also stimulate CCK, an appetite suppressing hormone in you gut.