[dundarious]

For some measure of "accepted fact", yes: https://pubmed.ncbi.nlm.nih.gov/19562864/

> It is the position of the American Dietetic Association that appropriately planned vegetarian diets, including total vegetarian or vegan diets, are healthful, nutritionally adequate, and may provide health benefits in the prevention and treatment of certain diseases.

Eating quite minimal animal products is the norm in societies with the best longevity. A "good" vegan diet is very very healthy and cheap, only requiring supplementation with B12. This specific need for supplementation is more an artifact of modern farming practices -- we clean vegetables of the bacteria that produce B12, because we use fertilizers that must be washed away or else risk disease. Animal products contain B12 because those animals still eat enough bacteria produced B12 -- all animals get B12 from bacteria or from eating animals that get it from bacteria.

There are parts of the world where environment or culture doesn't allow for a "good" vegan diet. If you're in a developed nation and not in a food desert, the environmental aspect doesn't apply.

[sweetheart]

Actually cows do produce some levels of B12 in their bodies, but we still supplement them with the raw ingredients for that B12 so at the end of the day, basically every person living in the developed world is getting their B12 from supplements, one way or another.

Also, it’s not only the American Dietetic Association that believes veganism is healthy for all stages of, it’s the opinion of all the largest ones around the world!