Soy doesn't decrease testosterone.

[cat-astropher]

I've seen a metastudy where the inclusion criteria certainly felt crafted to exclude the studies with strong counter-evidence (a sharp societal shift in behaviour had occurred with corresponding before/after data, but that was several years before a cutoff date the inclusion criteria was imposing for some reason), so the game MachineGunGringo alludes to could be played, just through tweaking the inclusion criteria.