Obese people see unusual levels of testosterone

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muscle mass and bone density and keeps ... drive and physical energy at healthy levels. Testosterone levels naturally decline as men age. But those who put on weight — as little as 13.6 kg for a 6-foot man — lost as much testosterone as if they had aged 10 years. Obese girls going through puberty had the opposite problem; girls had two to nine times the levels of testosterone as girls of normal weight, which could impair reproductive health.