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

Journaling leads to success. Counting calories is easier if you write down (or type in) what you eat, including serving sizes and details such as condiments you may have added. “Research has shown that exercise and journaling really make a difference in long-term weight management,” says Gail Curtis, assistant professor at Wake Forest University Health Sciences in Winston-Salem, N.C. A detailed journal will help you identify your successes and pinpoint where you can cut additional calories or replace high-calorie foods with low-calorie ones.