Endogenous Testosterone After 40: A 0.4 Percent Yearly Decline, 2 Percent True Hypogonadism, and Why Most 'Low T' Is Body Fat and Sleep

Every man's testosterone drifts downward from his forties, and every man has by now heard that this explains his fatigue, belly and flagging libido. The hormone does all the things the advertising says - it builds muscle and bone, drives libido and supports mood and red blood cells - but the size of the age effect is smaller than the marketing implies, true deficiency is uncommon, and most of the men who test low have a reversible cause sitting in their waistline or their sleep. Understanding the difference between ageing and illness is what keeps a man out of a clinic he does not need.

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