Read up on caloric restriction and longevity. This link came up but there are others. Not sure how solid this theory is, I am just mentioning it because OP was

Read up on caloric restriction and longevity. This link came up but there are others. Not sure how solid this theory is, I am just mentioning it because OP was very sure it's the other way around. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4262579/#:~:text=The%20idea%20that%20there%20is,their%20metabolism%20(per%20gram)%20and https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4262579/#:~:tex...