Doctor A.T.W. Simeons discovered HCG could be used for the treatment of obesity in men and non-pregnant women. He found that the mechanism of HCG assists in removing stored fat, while sparing lean muscle, by forcing the body to rid fat through its own natural elimination process. His patients received a daily injection of the HCG for 40 days while following a very low 500 calorie diet. During his research Dr. Simeons noticed several important factors, including the lack of symptoms one would normally expect from a patient on a very low calorie diet. For example, his patients had no headaches, hunger pains, weakness, or irritability as long as the low calorie diet was combined with HCG.