" This brings us back to the questions we asked earlier: If people eat less on carbohydrate-restricted diets, why aren’t they hungry. And if they don’t eat less, why do they lose weight? If the restriction of carbohydrates works to ameliorate this defect in fat metabolism, as Pennington speculated, then weight will be lost, hunger will be absent, and calorie consumption may decrease, while energy expenditure will increase. This is no more than the consequences of the law of energy conservation applied to a biological system that works to conserve body composition and maintain a healthy flow of fuel to the cells and tissues. "

― Gary Taubes , Good Calories, Bad Calories: Challenging the Conventional Wisdom on Diet, Weight Control, and Disease