I might consider going vegan for all of us if I could be convinced that a vegan diet could include adequate levels of all essential nutrients, and also if the environmental impact was less than that of being vegetarian.
A vegan diet can be nutritionally complete for any age and definitely has a lower environmental impact than a vegetarian diet. Even just cutting out dairy would significantly reduce the environmental impact of what you eat.
So much vegan food is highly processed, over-packaged and transported huge distances. I know it's possible to avoid these foods, but not entirely practical for a busy family, and slightly fussy children.
This is as true of omnivorous diets. Vegan alternatives to processed foods are themselves generally processed, but I see that as a like for like replacement. Vegan meats are processed, but entirely avoidable.
Humans evolved to be omnivorous and as such there are certain nutrients that are essential to health that it's impossible to get from plant sources. Vitamin B12 is one of these. From what I understand all vegans need to supplement B12 or risk life-changing effects. B12 (in a form we can use) comes only from animal products (meat, fish, dairy, eggs). B12 is formed in soil by microbes, so there's some evidence that eating dirty vegetables is an option! The B12 in animal products comes from grazing animals consuming soil with their food.
These days farm animals get their B12 from supplements, not from grazing the soil. So if you take a supplement instead of eating a product from an animal which has been fed a supplement, there is little difference in my view.
So to be a healthy vegan I would have to take B12 tablets, and it just wouldn't feel like a healthy diet.
Just out of interest, why is this? I’m never really sure why people are opposed to supplements. We take folic acid supplements during pregnancy etc and it just doesn’t seem to be an issue, but when it’s b12 people get anxious about it even though it’s fed to animals as a supplement anyway.
Then there's making sure we consume the full range of protein types needed, which is harder than it sounds on a vegan diet. And iron.
This is a valid point. Once you’ve learned your way around vegan protein and iron sources it’s easy but it does take some initial learning / getting used to.