Why do we eat so much? here's why, and how you can make positive changes

"Most people don't know how many calories they consume in a day, but they do know that they have gained weight over the past several years. Dr. James R. Clark's educational video is designed to teach the viewer how to count calories, how to calculate how many calories that can be eaten each day to maintain current weight, and how difficult it is to accurately estimate the number of calories in the foods and beverages that are consumed each day."