Natural history of obesity due to POMC, PCSK1, and LEPR deficiency and the impact of setmelanotide.

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This study shows that for genetic forms of severe early‑onset obesity caused by disruptions in the brain’s MC4R pathway, traditional diet and exercise rarely change long‑term weight patterns, but targeted medication like setmelanotide can reduce hunger and slow weight gain, helping families affected by 16p11.2 syndromes understand why genetic testing may open doors to pathway‑specific treatments rather than lifestyle‑only approaches.