A hamburger is displayed in Hollywood, California October 3, 2007. Eating a high-fat, high-carb fast food meal produces damaging cellular changes that are greater and longer-lasting in obese people than in normal-weight people, a new study shows. (Lucy Nicholson/Reuters)Reuters - Eating a high-fat, high-carb fast food meal produces damaging cellular changes that are greater and longer-lasting in obese people than in normal-weight people, a new study shows.