Well, I lived in an Isaan village for the best part of a decade (about 40km outside a city)
The villagers ate plenty of grilled pork and chicken.
Various larb meats were available, including beef.
Chicken soup, fish soup. Eggs galore.
I do agree that I felt we didn't eat enough fruit n veggies, except bamboo,mushrooms, and eggplants.
We had a Sunday market at our nearby amphur with all the meats and there would also be trucks driving around every few days selling it