Exactly. My father lives in Thailand and it is somewhat similar there, except they do mostly eat meat and fish. It is often a small amount though, mostly due to cost. The last time I was there I went to stay with some of my step mother’s sisters in the North and we ate at local restaurants. There are a lot of dishes with the bits and bobs that most Westerners don’t want to eat!
I think there are another couple of factors though which have a big impact on health and they have nothing to do with food. Most people look at food as the only thing to “blame” or that needs changing. Yes, it is often the biggy but don’t underestimate the value of other factors. On average, most Thais get more exercise, especially the poorer ones simply because of necessity. They are often on their feet all day and or walking a lot. Maybe not a direct factor, but regular exercise (especially the consistent every day type) does positively impact BG and general health and wellbeing by improving circulation etc. The other important factor that is really normal in Thailand is family and community - in general, they are a very sociable and caring culture. My step mother’s mother for example lived with one or other of the sisters after her husband died. She never lived alone. Community and human contact also has a big impact on our heath.