Northeasters are mostly descendants of immigrants from Shandong and Hebei. Why are they much taller than their predecessors? What factors?

I come from the northeast, and my hometown is from Shandong. I think the northeast people are about the same age as the Shandong people. If there is any difference, I think it should be caused by different environments and different eating habits. Winter in Northeast China is cold, so people need to supplement more heat. People eat more meat and high-fat things, which may promote their growth. However, eating too much high-fat food is harmful to your health. Welcome to the northeast, you will find that it is freezing outside, with heavy snow, and eating meat indoors is fierce. Bye.