> Only when they were fed 10 to 15 percent less did they slim down to the size of their unaltered siblings. So, it has a fault. Metabolic efficiency means if o

> Only when they were fed 10 to 15 percent less did they slim down to the size of their unaltered siblings. So, it has a fault. Metabolic efficiency means if one has a slower metabolism, one requires less fuel. Eat less.