The amount of body fat we carry is regulated much like a thermostat (see The Body Fat Thermostat Part1). If you eat less, you’ll become more hungry (see Part2 — The Science, andPart 3 — Understanding Hunger), which will eventually make you want to eat more. If you white knuckle it and use all your willpower to force yourself to continue eating less despite the increased hunger, (driven by hormones), then your body will reduce the Calories Out so that Body Fat is maintained. (See Part 4).