you


example, in the 1930's about 100,000 Americans took a substance called dinitrophenol, which prevented food energy from being turned into fat, turning it into heat instead. In the end howeve, it was shown to be a poison, causing blindness and death. Another popular hormone was thyroid hormone, which increased metabolism and caused weight loss. However, it too was shown to be dangerous, as it disrupted heart rythm and caused muscle weakness. In the 1950's, amphetamines were introduced, and they were succesful in raising metabolism and sur...