umm, it sounds like it's genetics and not diet. Cuz there wouldn't be people left in China if it is the diet.
The effects aren't felt until the middle stage or end of life.
The most vulnerable have already been evolutionarily selected out of the population for their inability to cope with the starch-heavy diet there. Sweet piss disease(aka diabetes translated literally) is a centuries-old term.
The order of bodily failure is also different, with diabetes coming first before obesity, if obesity is even reached. There may be a durability against diabetes for many years before it finally can crack through a Chinese at around 60-70 years of age.
The uptick in cancer rates now is a result of the totality of typically latent damage on the victim 20-40 years before.
And the general of obesity has finally reached the large diverse country as well. As the already predisposed palette is now including more soda in their diet.
Cultural behavior also predisposes to poor choices. There is a heavy, heavy "internal education" to cut costs, and everything is colored by this parenting, including food choices. So, you can count on a Chinese descended individual to at least be tempted to shop at Aldi or Walmart but never set foot in a Wegmans even if they make six figures and drive something like a Bimmer. "Premium food" like organic will likely never be considered. Other manifestations of this cultural educaiton inculdes dodging applying for rental licenses.
Or in the matter of restaurants in China, the use of "gutter oil"(waste oil down the sink) or "spit oil"(someone's old hot pot oil gets dumped into a new customer's hot pot).
Anyone who has been in a 99 Ranch or Great Wall knows that shelf stable stuff in those stores are heavy sugar or heavy starch; they would not be selling Asian Ramen, Pork fu, dumpings, or buns if they weren't selling. Just that Americans shut their brain off anytime they hear the word "Chinese" got all sorts exotic feelings. While the American enjoys sweetened steaks or burgers with bread to anticipate a heart attack, Chinese enjoy rice and/or flour-wrapped pork seasoned with soy sauce to anticipate colorectal cancer. More similar than different.
en.wikipedia.org
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