Eli5 How does food and liquids remain inside the stomach and not “leak out of your mouth” whilst being in space?

Question

Eli5 How does food and liquids remain inside the stomach and not “leak out of your mouth” whilst being in space?

In: 82

Answer 1

There is a sphincter valve at the top of your stomach where it connects to the esophagus. Normally unless swallowing (or in case of dysfunction , which can cause acid reflux for example) it is closed and prevents food from emerging even when hanging upside down, for example.