Bought and paid for
But conflicts of interest are always interesting. I recently came across a paper that concluded that slight dehydration has important effects on mood and cognition (Armstrong). I was taking it seriously for a few minutes until I discovered that it was funded in part by a giant corporation that sells bottled water, which made me roll my eyes and get a lot less interested in the results (which were minor anyway, I thought).
So now what to believe? Who knows: the data may be perfectly good, or hopelessly corrupted. We just can’t tell without more information. We’ll simply never know what’s true without more research…which will probably be hard to get anyone but another water bottling company to pay for!