> Sperm counts have been dropping for a long time Every couple of years this concern bubbles up. It seems to be established that sperm counts in males are goin

> Sperm counts have been dropping for a long time Every couple of years this concern bubbles up. It seems to be established that sperm counts in males are going down. But I’ve yet to see substantial evidence about the possible causes. The effect of plasticisers e.g. were found in animal models usually with rather high doses. An increase of obesity over the last 50 years might also be a likely cause as obesity is linked with hormonal issues. Furthermore, the average age of first time parents has increased significantly. That could also explain why IVF got more popular as sperm counts (and egg „quality“) are age dependent as well. AFAIK there is no empirical study today proving any link between environmental issues and sperm counts.