From my experience, every vegan I met didn’t eat right and lacked lots of nutrients. They always looked sick, pale and not alright ‘upstairs’.
It’s very difficult, if not impossible, to compensate for eating no animal products.
As a result of their improper diet, most of them are somewhat crazy and should be ignored.
There was a vegan family in my carpool when I was a kid (back in the late 50s, early 60s). They made the kids be vegans too. They were the sickliest, puniest, palest kids --any bug that was going around school, they caught it first and caught it worst. Always had sniffles and coughs, never played on the playground, it was pitiful.
One of the parents with kids in the carpool was our pediatrician and a close friend of my parents. He was discussing with them whether to do an intervention (though they didn't call it that then). He was really worried about the kids. He said that growing children especially needed the proteins and amino acids that you could only get from red meat, and that depriving them of eggs and dairy as well was going to kill them . . .
I don't know what happened, those decisions were made way above my pay grade when I was 8 or 9 years old . . .