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This reminds me of a lady I used to work with around like 2001 or so. She was the first vegan person I'd ever spent much time talking to. Every vegan I'd met up to that point were people I'd consider to be "health nuts" as in they were constantly talking about nutrition, they were all on the thin side, most of them didn't smoke or drink. After talking to this lady for a while though it became apparent that her "healthy" vegan diet was like 80% deep fried oily junk food and the other 20% was mostly booze lol. She was always complaining that she couldn't lose weight. I remember thinking at the time how silly it seemed to go through all the hassle involved with staying vegan while still getting zero health benefit from it.
Even if you're only vegan for moral reasons it seems like you'd have to really work to make it that unhealthy lol