The sensation of fullness is set in motion as food moves from your mouth down your esophagus.

当食物从您的嘴巴顺着食道向下移动时，就会产生饱腹感。

Even though we're not hungry, we can still want to eat because we have that pleasure system in the brain, which can override these sensations of fullness, for example.

即使我们不饿，我们仍然会想吃东西，因为我们大脑中有快乐系统，它可以覆盖这些饱腹感。