[kayodelycaon]

> While not impossible to do without, health problems often develops with time.

I beg to differ here. I'm allergic to all dairy products (protein allergy), and I haven't had any problem keeping a healthy diet.

Dairy isn't at all necessary for survival after you're able to eat and digest solid food. In fact, most mammals and 65% of humans develop lactose intolerance by adulthood.

Meat? That's a bit more difficult to replace in a completely vegan diet without vitamin supplements.