In USA TODAY we read about diets promoted by celebrities and that these "plans are supposed to remove chemical and dietary toxins from the body. But weight-loss experts have long been skeptical about the claims, saying there is no scientific evidence such programs do a better job than the body's own organs. They also say many of the plans are deficient in protein and other nutrients."

Eating smart, not eating less, may be the key to losing weight. A year-long clinical trial by Penn State researchers shows that diets focusing on foods that are low in calorie density can promote healthy weight loss while helping people to control hunger.