The problem with looking at the question 'does red meat cause health issues?' is, the norm is for people to eat red meat. In other words, the profile of the population that eats red meat is more or less the same as the profile of the population generally. I think it's safe to assume that people who *don't* eat red meat do so for health reasons, which seriously conflates the issue, since, if people are willing to take such a drastic step to care for their health, they likely take a lot of other steps as well, exercise, weight loss, better diet generally and so on. So the question really becomes 'do people who invest energy in caring for their health live longer?', and the answer is of course, yes. However, the decision to not eat red meat isn't necessarily what makes people live longer, it's just part of the current populist view of health, some of which is good and correct, i.e. weight loss & exercise, some of which isn't (high carb diets, no red meat etc). Personally, I doubt the consumption of red meat has a much different health impact than any other kind of meat, in fact I think it's probably a lot better, which is why it's our main source of meat. If chicken or fish were better, then that'd be our main source, but it's not.