The Fat-Loss Blueprint

Body fat is stored energy. When you take in less energy from food than your body uses, it draws on stored energy — including fat — to make up the difference. That is the foundation of every successful fat-loss approach, whatever it's called.

But "eat less, move more" is a slogan, not a plan. Your body adapts to dieting: hunger rises, energy dips, daily movement often drops without you noticing, and if you don't train and eat enough protein, some of the weight you lose is muscle. A good plan accounts for all of this.

Weight loss versus fat loss

The scale measures everything: fat, muscle, water, food in your gut, and glycogen (stored carbohydrate, which holds water). Early drops on a new diet are often mostly water and glycogen. Day-to-day changes are mostly water. What you want is fat loss while keeping muscle — which may show on the scale more slowly but changes how you look and feel far more.