Male Fertility as a Proxy for Health.

Plain-language summary

This narrative review argues that a man's fertility is a readable signal of his health generally, not just of his ability to father a child. The reasoning runs like this: sperm production is unusually sensitive and depends on genetics, hormones and metabolism all working properly, so a wide range of medical problems shows up in semen quality before it shows up anywhere else. That makes poor fertility an early indicator of a problem already present. The same logic runs forward in time: the authors survey evidence that men with impaired fertility go on to have higher rates of cancer, cardiovascular disease and autoimmune disease than fertile men, because the underlying conditions that suppressed sperm production keep acting. The review also covers what damages fertility in the first place: inherited genetic faults, certain medications, diet and environmental pollutants. Because this is a narrative review rather than a pooled analysis, it does not report how much higher those later risks run, or over what timeframe.

Key findings

• Male fertility is tied to genetics, medications, diet, and environmental pollutants.
• Sperm health may predict future risks of cancer, heart disease, and autoimmune conditions.