https://www.agweb.com/opinion/drivers-us-capita-meat-consump...
https://www.agweb.com/opinion/drivers-us-capita-meat-consump...
South Korea's meat consumption per capita has also increased consistently since the Korean War.
https://www.researchgate.net/figure/The-relationship-between...
Only in late 19th/early 20th did European stature begin to return to natural levels from the Mesolithic.
This effect was seen in American Indians, too. When early Europeans arrived in America, the Great Plains tribes were the tallest people in the world, due to game animal (bison, elk, deer, etc)-centric diet:
https://www.sciencedaily.com/releases/2001/05/010529071125.h... https://www.westonaprice.org/health-topics/traditional-diets...
Other studies: https://pubmed.ncbi.nlm.nih.gov/30823563/ https://www.sciencedirect.com/science/article/pii/S1570677X1...
With animal products it's basically just easier to reach this nutritional point at least when compared with more traditional plant based diets. Of course with modern plant based supplements and nutritional knowledge and food availability etc. you can more or less narrow the gap these days at least in a technical sense, but sometimes in the real world the problem can be getting the kids to actually eat enough protein if they are fussy eaters who decide they don't like a particular protein source (whether animal or plant based) or are filling up on nutritionally sparse junk food first.