Veganism is a luxury belief system. It's something that's only available to the wealthiest group of people in the world. (By which I mean westerners, who aren't necessarily rich by western standards but certainly are compared to most of the world.) And it's largely utter bollox that involves eating tonnes of highly processed food that's nutritionally lacking, not actually particularly environmentally friendly and utterly unsustainable if all 7bln of us somehow had the financial means to eat that way.
I am someone who knows I can never risk a vegan diet. I have a strong family history of pernicious anaemia and a vegan, or even vegetarian, diet would be incredibly dangerous for me. Dairy and eggs (along with fruit and vegetables) are essentially my staple foods, though I eat at least a portion of basic carbs and meat/foul/fish every day. I can't honestly fully convey how day to day amazing I feel. I'm in my 40s, athletically fit, have easy access to ultra endurance at high intensity, have muscle definition that you can see through most of my clothes, have excellent end range strength (ie healthy flexibility). And I'm still improving, getting faster, stronger, more flexible rather than slowing down despite my age. Despite my low body fat levels, I still have a full face, clear skin, shiny hair, great teeth and strong nails.
Conversely pretty much all vegans I know are deeply unhealthy. Either very under weight or skinny fat, ie desperately lacking in muscle. Poor hair, dull skin, often clearly somewhat anaemic. Which isn't to say that all meat and dairy eaters are healthy, we know most people aren't. But the idea that a vegan diet is inherently healthy is such utter bollox. It asks us to deny the obvious evidence that we can plainly see. Very few vegan people are fit, strong and healthy. Some are, but that takes enormous amounts of planning and the vast majority just don't do that.