people always offer you more food. The host will ask you two or three times if you want more food. First , you could say no. Then the host insists again , and you could say no again. The host insists a third time , and you could finally say yes and take a little. If you really don't want any more , take very little and leave it on your plate. It is the same with whatever your are drinking. During the meal , when your cup or glass is less then half full , your host or neighbor will refill it. It is polite to refill your neighbor's glass all through the meal.