If "Calories in, Calories out" is a myth then the Law of Conservation of Energy is repealed. Wheee! Let's all start making those mythical Perpetual Motion Mach

If "Calories in, Calories out" is a myth then the Law of Conservation of Energy is repealed. Wheee! Let's all start making those mythical Perpetual Motion Machines! Obviously, the human body is designed (evolved!) to run on as little energy as possible when food is scarce. It does that by reducing (NOT eliminating!) its energy requirements. That's why reducing your food intake doesn't necessarily produce a loss in weight: As long as you're taking in more energy than your body's minimum energy requirement, you won't see any weight loss because your body's reduced energy requirement has kept pace with the reduction in energy available.