I dunno about in restaurants or stuff, but i DO know some about going to some else's to eat.
- don't ever say you had enough, that's to drink or to eat.
- eat everything on your plate
- make alot of annoying slurping-noices when eating any type of noodles, this will tell the host that you're enjoying the food.
- train your chopstick skills, having a poort chopstick-technique will make you sort of an enemy to their culture.
That's a few things that i can come up with atm, it's been a while for me so