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Maximizing fat loss while preserving lean tissue mass and function is a central goal of modern obesity treatments. A widely cited rule guiding expected loss of lean tissue as fat‐free mass (FFM) states that approximately one‐fourth of weight loss will be FFM (i.e. ΔFFM/ΔWeight = ∼0.25), with the remaining three‐fourths being fat mass. This review examines the dynamic relationships between FFM, fat...