Genes take charge, and diets fall by the wayside - International Herald Tribune

Genes take charge, and diets fall by the wayside - International Herald Tribune: "The implications were clear. There is a reason that fat people cannot stay thin after they diet and that thin people cannot stay fat when they force themselves to gain weight. The body's metabolism speeds up or slows down to keep weight within a narrow range. Gain weight and the metabolism can as much as double; lose weight and it can slow to half its original speed"