I had a chinese man that I worked with tell me this.
Have you ever seen a fat chinaman?
I answered no
Have you ever seen a chinaman eat in a chinese restaurant other than the people who work there?
I answered not to my knowledge.
He laughed, and then said its because we don't eat that crap. We eat fish and chicken and vegetables, but we dont eat crab rangoon, pot stickers, fried biscuits, fried rice, or all the sauces we make.
Most chinese restaurants cater to western eating habits. Healthy food doesn't taste good to the average person.