Why do we sometimes feel like we can’t keep eating anymore without throwing up, yet we can still have dessert?

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Yesterday I was eating pizza (my favorite food) and when I was getting to the last pieces I felt like if I ate just one more bite of pizza, I was going to throw up.

However, I was able to eat a dessert without problems (a large bowl of cereal with milk).

If my stomach wasn’t really full, why couldn’t I keep eating pizza without throwing up?

In: Biology