"Research shows that although people can lose 5 to 10 percent of their body weight on any given diet, dieting itself is a consistent predictor of future weight gain. Why? At some point, everyone stops dieting. The lean muscle diet [seeks to solve] the sustainability problem while offering immediate results. It's simple: act as if you already have the body you want. If a reader is, say, a 220-pound man who wants to become a muscular 180-pounder, he then uses [the book's] formula to eat and train to sustain a 180-pound body"--