This doesn't pass the smell test. China had 1 billion people in 1982. In 1985, obesity rates among children were 0.03% for boys and 0.12% for girls. They were able to produce enough food to feed 1 billion people in the 1980s, but there were nowhere near as many obese people. Within the time period of your stats (obesity rates up ~2.5x since the 00s), China's population has grown from 1.3B to 1.386B, basically a negligible increase.
A more likely explanation is that the arrival of cars, fast food, and a middle-class lifestyle is making Chinese people obese, just as it's making Americans obese. Studies show a direct correlation between obesity rates and rates of car ownership in China.
A more likely explanation is that the arrival of cars, fast food, and a middle-class lifestyle is making Chinese people obese, just as it's making Americans obese. Studies show a direct correlation between obesity rates and rates of car ownership in China.
https://en.wikipedia.org/wiki/Obesity_in_China