单选题 Since 2000, the number of college students dieting, vomiting, or taking laxatives to lose weight has jumped from about 28 to 38 percent, according to the American College Health Association's annual surveys. Well - balanced caloric intake, with regular meals and physical activity - not dieting -is the best way to avoid obesity, says Kreipe, a professor at the University of Rochester Medical Center. That's why, in his view, calorie information doesn't benefit students. "Nutrition is not a simple thing that can be distilled (提炼) down into a label, "he says. "There's a tendency for people to overinterpret what a specific number means. "
According to Prof Kreipe, the best way to avoid obesity is composed of all the following factors except

• A. well - balanced caloric intake.
• B. regular meals.
• C. physical activity.
• D. dietin