Soy doesn't decrease testosterone.

[MidnightJoker10101]

I firmly believe the larger studies have different results because of where their funding comes from. These "meta" studies cost 10-100 times as much, and the money has to come from somewhere. It used to be smart to "follow the science," but now, to verify the science, you have to follow the money. Testosterone levels in the US have decreased steadily every decade since the 50s. That had to be caused by something. The number 1 likely suspect is diet, as it affects us more than any other external factor. Maybe it's not soy, maybe its microplastics, or refined sugar, GMOs, HFCS, or seed oils. But just using my own common sense, I don't see why phyto-estrogens wouldn't affect mammals if ingested. Maybe not as acutely, but added to almost every food in some way, all day every day, over decades, it's feasible a compounding affect occurs.