There was a vegan community here (Black Hebrews) and their babies were dying left, right and centre. So the Dept of Health went and gave them lectures and they are ok now. Dunno exactly what the solution was but they adopted it. But this intervention was only possible because they were a community and so it all came to the notice of the Authorities. They were in a tricky immigration situation too (the whole lot of them) and I think that also gave the Dept of Health a lever and the community a reason to adopt their advice (or they would have been extradited).
I'm a (lacto - ovo) vego (28+ years). The 3 kids all eat meat (outside the house). Which is their choice. Vegan is too much, imo. From all points of view - nutritional, prep. times and expense, social.
All you need is love...la-dee-da-dee-da...all you need is love!