system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 In space, how do foods go down to astronauts' stomachs and stay there?

Since there is no gravity how is it possible that food go down to the stomach, always wondered..
gpt
The peristaltic movements (I hope it's correctly written in English) is what pushes the food to the stomach (yes it basically pushes). Not the gravity. 
That's why you're able to eat being upside down (don't recommend with liquids it will probably go up to your nose because gravity).
And also astronaut food is prepared for gravity 0 occasions.

Edit: pushes, not punches.