Yeah. There was also a time when 8-year-olds did a full day's work in the mines and malnourishment was the norm.
You should think about the complexity involved in eating a healthy vegetarian diet before you start being dismissive of it. Meat is easier in some significant ways.
Lets not blow the difficulty of being a vegetarian out of proportion. Eating a healthy vegan diet is still difficult. Eating a healthy vegetarian diet is not. There are plenty of cook books describing varied and balanced vegetarian meals. There are plenty of restaurants that serve good vegetarian meals and many supermarkets (at least in Western Europe) also provide the necessary ingredients.
(I have been a vegetarian for 16 years now, almost half of my life.)