It isn’t known to be causal but one suspected link is nitrites present in processed meats. This study seems to be the best we have. It’s observational and invo

It isn’t known to be causal but one suspected link is nitrites present in processed meats. This study seems to be the best we have. It’s observational and involved self reporting of diets. https://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1004149 https://journals.plos.org/plosmedicine/article?id=10.1371/jo... It’s complicated too because nitrites found in fresh vegetables are strongly correlated with health improvements. This could mean that nitrites aren’t the problem, nitrites in the presence of animal proteins is the problem, or in the presence of fat, salt, etc. It doesn’t appear very clear to me.