Popular diet foods are not always what they might seem, and a public service corporation has concluded that the labelling on some products is so inaccurate that the products should be banned. Well-known diet food products manufactured by 15 companies in Tokyo and Yokohama selected by the Japan Leisure Sports Association were investigated by officials of Japan Food Research Laboratories. The officials looked at water content, protein and fats in nine of these products, and found that seven failed to live up to their labelling. One product mis-stated its nutritional content by over 20%, reported the Asahi Shimbun.