I'm trying to look for scientific studies that study the impact of careful vegetarianism/veganism on DNA methylation at the locus level (meQTL study).
The closest I could find was this one, that proves that there is no massive demethylation in vegetarian. But it only looks at a global level, moreover, a lot of the tested vegetarian are B12 defficient, so the "careful" part is not checked either.
Are there more precise studies, peer reviewed or not, that look at the impact of vegetarianism/veganism on methylation, at le locus level, in the case of proper B12 consumption?