In this article entitled, Be Wary of "Calorie Blockers" by Stephen Barrett, M.D, shows various of products to help lose weight and the cause and effect. Many people eats more at the same time maintain weight by using or trying different kinds of products such as pills, starch blockers, cal-ban 3000/cal-ban tablets, gymnema sylvestre, and chitosan to fasten the metabolism and lose weight. On the other hand, what people don’t know is that this “product” is a deception so that the sales would go up. According to The U.S. Food and Drug Administration, they have collected reports that one of the users died because of using the Cal-Ban and the side effect that involved stomach obstruction, upper and lower intestinal obstruction, nausea, and vomiting.