The Forty-Day Hunger Diet is a diet requiring no exercise, yet it is both fast (substantial weight loss in a short period of time) and real (the weight loss is not merely water loss). I followed the diet earlier this year to lose 25.2 lbs in 39 days. For comparison purposes, I’m a 42-year-old male, and I went from 208.4 lbs to 183.2 lbs.