Chinese study links obesity to lower sperm counts in 71,000 men, contributing to global fertility crisis.

A Chinese study involving data from 71,000 men across 50 previous studies links obesity to a drop in sperm counts, which is contributing to the global fertility crisis. Obese men had lower semen volume, total sperm count, and sperm motility compared to those with a healthy weight. The research adds to growing evidence suggesting that obesity may be a key factor in the decline of human semen quality.