It's really hard to figure out whether to trust this study, I can't find a link to anything that's been published/peer reviewed on the OP link. These kinds of e

It's really hard to figure out whether to trust this study, I can't find a link to anything that's been published/peer reviewed on the OP link. These kinds of epidemiological studies are incredibly difficult, and easy to get wrong. There is a good paper on this topic though: http://www.nature.com/nature/journal/v529/n7584/full/nature16166.html http://www.nature.com/nature/journal/v529/n7584/full/nature1...