The problem with what you're suggesting is that proving something improves longevity is really, really hard. If you want to find out if something's going to hel

The problem with what you're suggesting is that proving something improves longevity is really, really hard. If you want to find out if something's going to help people live longer, you have to study it for a very long time. And of course given the length of the study and the multitude of other factors that may affect longevity, you'd need to have a huge population of participants in the study. If there were something that let you live to 200, sure. But trying to answer a question like whether the Mediterranean diet extends life on average by 10% is very, very hard. Even if we had great records of what everyone ate, you'd still have to deal with the fact that people consuming that diet tend to live in the same geographical area and share a lot of other behaviors that could very well affect longevity.