A far more believable source would be a university studying causes of depression. Literally anyone else not profiting off meat would be more believable though.
Universities are prone to fads and political correctness. Try publishing results that are unpopular in academic circles, and see how long your funding lasts.
Sure, it would be more believable if they did. But they won't.
Sure, it would be more believable if they did. But they won't.