Diet food companies claim that their low-calorie foods help consumers to lose weight. Such claims are not simply groundless but turn the truth upside down. It is well-known that most consumers of low-calorie foods have a body mass index (BMI) greater than 25 and so are classified as overweight. Far from offering a weight-loss solution, diet foods are actually a cause of weight gain.
Which of the following, if true, most strengthens the argument above?
A. In some cases, those who are severely overweight can reduce their BMI to a level within the normal range after continuing with a steady diet of low-calorie foods over a period of not less than six months.
B. Some world-class athletes have a BMI greater than 25; these athletes are not overweight but have exceptional muscle mass.
C. Eating diet foods is normally a consequence rather than a cause of weight gain.
D. Diet foods provide better nutritional value and contain fewer calories than the average fast food meal purchased by an individual whose BMI exceeds 25.
E. Overweight people who switch from regular foods to low-calorie foods sometimes eat additional portions of the low-calorie foods, thereby increasing caloric intake.