Food coma refers to the feeling of listlessness, bordering on sleep, that one feels after eating a large meal, often caused by a rush of blood to the stomach and intestines during food digestion.

“飯氣攻心”指的是在大吃一頓后感到的困倦，通常是因為在食物消化過程中血液大量涌向胃的緣故。

Example:

I ate the whole pizza and now I'm slipping into a food coma.

我吃了一整張比薩，現在正逐漸進入飯氣攻心狀態。