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Lean mass during weight loss: a review proposes an interpretation

This review proposes that some measured lean-mass reduction may reflect adaptation to a lighter body.

By SHIFT AI Newsroom · Published 13 September 2026 · Updated 3 October 2026

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This review proposes that some measured lean-mass reduction may reflect adaptation to a lighter body. That is a conceptual explanation requiring testing, not a new trial proving muscle preservation. Lean mass, skeletal muscle, strength and physical function are different measures. The paper argues for assessing meaningful functional outcomes rather than interpreting a change in lean mass alone.

SHIFT’s take

What we think this could mean for you, and what remains uncertain.

Read the study design and limits alongside the finding. This article does not determine individual treatment suitability.

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