The short answer is that we don't know. Refreshingly enough, this article seems to focus on that fact.<p>There are studies that say eating meat will give you cancer, or just kill you younger in general, but there are studies that show the opposite, and studies that show no correlation.<p>And pretty much all of these studies have issues, the biggest usually being, as the article says, that they're observational, based on a subject's ability to remember what they ate, how much they ate of it, and report that information correctly and truthfully.<p>The human body is massively complex, and we just don't know very much about how diet affects it. We know that eating a lower calorie diet helps you lose weight, and that's about the only thing we can prove with any kind of certainty.<p>Does a low-carb diet improve health outcomes? Or a vegan diet? We just don't know, and anyone that tells you they <i>do</i> know is either selling you something or, at best, telling you what worked <i>for them</i>.