Comment by fredrikholm

The famous JAMA cohort study[0] of 120k people showed some 5x difference in all cause mortality and morbidity between sedentary and highly active individuals, showing effectively no upper bound.

The NHANES study[1] is another one that showed huge jumps in slowed aging with proportionally (to calories) increased fiber consumption.

There's a lot of these. I recommend Dr Michael Greger for a lot of them summarized. He's very biased towards whole food plant based diet (a type of vegan diet), but he references and cites every statement he makes and is generally a very good communicator.

There is a YouTube channel called Viva Longevity! that invites research authors and generally presents longevity/health information in a way that is very thorough and sincere.

0. https://jamanetwork.com/journals/jamanetworkopen/fullarticle... 1. https://www.mdpi.com/2072-6643/10/4/400