The secret to a disease-free long life may be simple, a new study says: Eat a third less food.
But for most people that is no easy task, so scientists have turned to monkeys to learn what a severely restricted diet can do.
The answer, from a 20-year study at UW-Madison: Monkeys that eat 30 percent fewer calories than normal are three times less likely to develop or die from age-related diseases at any given time than other monkeys.