Ashton Kutcher Yo-yos

Ashton Kutcher did some major yo-yo dieting for the sake of his ART, dropping the 10 pounds he gained for his role in Personal effects almost instantly for his next role in Spread.
How’d he do it???
He says, “I had just played a movie where I played a wrestler, so I had to lose like 10 pounds and stop eating and take care of myself. I really cut back to a meal a day. I was probably down to 175 pounds.”
Doesn’t sound healthy to us!
Is that how Demi stays so thin???
[Image via WENN.]