Not op, but I eat very little meat, and when i stay with vegan friends and eat their food it takes me longer to feel dirty. Its wild.

Cutting red meat & fast food made the biggest difference, followed by other meat, then dairy, in body smell.

Now that i think about it, i play sports and get very cuddly with vegans and i can't remember ever noticing anyone smelling too bad, which is surprising.

I have started trying to eat closer to vegan before we visit, because I definitely notice the difference on myself and my wife.

I can't say for sure. I've never gone down on a vegetarian.

Best guess from years of experience: Eggs are similar to meat in their effect. Dairy heavy diets lead to a specific smell all its own, like baby poop, but I don't think it changes the skin or secretion taste much.