> No, but you can take data on 1 million customers of food X, and see how many died, vs the non-customers. This is actually extremely difficult to isolate tha

> No, but you can take data on 1 million customers of food X, and see how many died, vs the non-customers. This is actually extremely difficult to isolate that the food X has a causal link to lifespan. Consider the amount of research and scale of research needed to evaluate the safety of cigarettes, which I can guarantee you has a significantly greater effect on lifespan than any possible food eaten.