That's why it's so hard to figure out the long term effects of a lot of foods. People who do/don't eat X, tend to make other choices as well, which can easily h

That's why it's so hard to figure out the long term effects of a lot of foods. People who do/don't eat X, tend to make other choices as well, which can easily have a bigger impact than X itself. Plus people are notoriously unreliable in accurately reporting what they eat and do. We'd need to have long term randomized controlled trials where the only difference between groups is the one variable. Which there's no ethical way to accomplish. So unless we figure out some other method, I suspect we'll never really know about many things in nutrition until we have fully accurate human simulations...