A woman was overweight so her doctor put her on a diet. He told her "Eat regularly for 2 days, skip a day, then jump back and repeat this procedure for 2 weeks. I expect you to lose 5 pounds."
When the woman returned, however, she had lost 20 pounds. The doctor was amazed. "Did you do as I asked?"
She answered. "Of course. But I thought I was going to die."
This puzzled the doctor. "You mean from hunger?"
"No, from all of that skipping and jumping."