Whole grains. Whole grains are rich in fiber. Eating whole grains allows our bodies to burn twice as many calories compared to when we eat unhealthy, high-fat processed foods. The fiber found in whole grains is important because that’s what makes us feel fuller for a longer amount of time, ultimately curbing our appetite. Good sources of whole grains: oatmeal, brown rice, whole oats, whole rye, and quinoa.