[oji0hub]

Looks like it. Also from the article:

"One study published in 2017 found that sperm levels among men in Western countries had dropped by more than 50% over the past four decades after examining 185 studies involving close to 45,000 healthy men."

[loveistheanswer]

Research indicates the growing obesity epidemic likely plays a big role in this equation as well.

[dred_prte_rbrts]

I'm assuming parent is asking for evidence around the "shrinking" part of the claim

[oji0hub]

They didn't mention that so I assume they're more generally referring to the claims made in the article.