The arguments that meat negatively affects longevity are weak, and the association between plant-based diets and extended lifespan may be based on insufficient control for confounders.

“there's a lot of talk right now about meat being bad for longevity and i simply do not believe that there's good evidence to back this up i think that in general the the arguments that meat is affecting longevity negatively are pretty darn weak even in the beginning of this study even in their introduction they say the association between a plant-based diet they call it vegetarianism and extended lifespan is increasingly criticized since it may be based on a lack of representative data and insufficient removal of confounders such as lifestyles”