Bryan Johnson· Author
Being in the lowest 20% of muscle mass among aged men, or having a slow walking speed of 0.8 m/s or lower, correlated with a 154% and 180% increased risk of severe erectile dysfunction, respectively.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Being in the lowest 20% of muscle mass among aged men, or having a slow walking speed of 0.8 m/s or lower, correlated with a 154% and 180% increased risk of severe erectile dysfunction, respectively.
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