Tarui Mian, honorary professor of Toho University School of Medicine, Japan, studied the efficacy of slim grass, and thought that slim grass could make half of the sugar ingested by human body not be absorbed, thus reducing the speed of metabolism and achieving the purpose of losing weight. Nowadays, "slimming grass" has become a bodybuilding drug popular in Japan. Many people lose weight obviously after taking it. Some people lost 7.6 kilograms two months after taking it, and the effect of losing weight was very remarkable, so slimming grass gradually became popular.