Surface tension. Also your GI is like a sponge. Also in "zero-G", you actually become the G.

Forget the propulsion, how do you even fuel a rocket in zero G? Wouldn't the fuel just diffuse and not reach the ignition? (the answer lies in the rocket's fuel injection system)

Peristalsis. Smooth muscle contractions mobilize the food throughout your body

Wake up, they're hiding zero G digestion issues to push space agenda, control the masses