That's the difference between good, solid studies and junk science. A really well controlled study takes into account many different factors and does its best to control for them, adjusting the outcome accordingly. If you have a science or research background, it's not too difficult to look at the methodology behind a study and determine from that whether you can trust the results.
What I was told from someone I trust in such matters was that the Canadian studies were among the best ever conducted on that subject. I don't think they were junk science intended to arrive at a particular conclusion. Unfortunately, a large number of the studies done in the US are quite the opposite, and as you said, under those circumstances, you can pretty much buy any result you want, and it will look good until you start looking at the methodology. I don't think that's the case with these.






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