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The most famous study is the seventh adventist study. The study in question is not tiny. About 70k people participated.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4191896/

https://www.sciencedirect.com/science/article/pii/S000291652...

Need to control for healthy habits also associated with healthier diets, such as exercising, not smoking, etc. It should also eliminate any participants with clearly unhealthy habits like poor diets consisting of fast food and living extremely sedentary lifestyles (different from just not exercising).

They also don't smoke or drink.. I am sure that chops off a few years

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