" study of a religious forty-day fast found that baseline growth hormone levels increased from 0.73 ng/mL to peak at 9.86 ng/mL. That is a 1250 percent increase in growth hormone, all done without drugs. And a 1992 study showed a fivefold increase in growth hormone in response to a "

― Jason Fung , The Complete Guide to Fasting: Heal Your Body Through Intermittent, Alternate-Day, and Extended Fasting