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Why not? He's being negative about your veganism and if he's saying "Vegan eating isn't healthy" then we all know that isn't true.

Lots of people could and do so you are not wrong :) However the way I see it is there are lots of foods/ substances that are bad for our bodies - meat, dairy, caffeine, drugs, alcohol, tobacco,...

There are also millions of people who smoke and are in good health. Does that mean we can assume smoking doesn't harm? I wouldn't allow my kids to eat meat. I wish that when they'd been born I knew...