Why Chinese Are Thin?

1.We don't eat big peice of meat that often like American.(I think it is because meat is relatively expensive for Chinese in China)
2.Cars are not so often as here in China,so we WALK a lot more Americans
3.We drink green tea instead of coffee with creamer and sugar.
4.We almost don't eat hamburgers.
5.Chinese don't have so many vacations like Americans and when we have we don't eat that much like Americans.