Two thoughts:

* Korean are tall by East Asian standards; 3-4 cm taller than Chinese and Japanese

* Thais don't eat that much, but they will massively over-cater, and there's not really the same taboo as in Europe of food wastage. My father, who like me spent a couple of decades in Thailand (although at different times) reckoned it was because historically they've had very few food shortages compared to other countries

Taller than the Chinese average, perhaps, but northern Chinese are generally much taller than southern Chinese. Guess what's next to northeastern China? That's right, Korea.

Thais don't have big meals, but they do snack incessantly, which makes up for it. And overcatering for guests is a pan-Asian or arguably a global phenomenon.