Everyday health.com offers this tip for losing 20 pounds:

Strategically eating less drops weight. A study of 811 overweight people who participated in four popular diets found that whether diets were low-fat, high-protein, or a combination didn’t matter — weight-loss success depends on cutting out calories. In fact, you can continue to eat filling portions if you simply replace high-calorie foods with low-calorie foods that contain a lot of water, such as fruits and vegetables. A study of 97 obese women who ate either a low-fat diet or a low-fat diet with additional fruits and vegetables found that those who emphasized fruits and veggies lost up to five pounds more.