Bryan Johnson· Author
A case report indicated a significant reduction in total sperm counts on days 15, 37, and 58 post-fever (though fever's impact doesn't directly compare to transient heat exposure).
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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.
A case report indicated a significant reduction in total sperm counts on days 15, 37, and 58 post-fever (though fever's impact doesn't directly compare to transient heat exposure).
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A case report indicated a significant reduction in total sperm counts on days 15, 37, and 58 post-fever