Bad nutrition or just less protein?

I say this because I was just looking at another thread where people were arguing about whether a vegetarian diet is suitable for humans.

And I vaguely remember reading about how average height increases in a given society as meat becomes more available and less of a luxury.

> Everyone was shorter 100 years ago.

Yeah, I knew that. But it's one thing to read about it and see the numbers and another to see in real photos. :)