" The American food industry produces 3,900 calories per person per day, with about 29 percent wastage, but we should rationally eat 1,800–2,000. Who eats the difference? We do! Throughout evolution, humans could eat only a fixed amount, but today that amount is limitless. "

― Robert H. Lustig , Fat Chance: Beating the Odds Against Sugar, Processed Food, Obesity, and Disease