He was just a kernel in a cloud, a bit of undigested food in an alien gut.

Laxatives work by helping your intestines digest undigested food, and do not make you lose weight.

The undigested food (waste and water) are sent to the colon.

After all, it was just undigested food; the fish would be thankful for the meal, wouldn't they?

If the dead man had eaten them but was unable to digest them, his belly should have been swollen with undigested food.

It will also store undigested food for up to 1 hour.

A hard lump of undigested food that had somehow penetrated the stomach lining, and which her body was trying to repel.

The doctors were critical of the diet's claim that weight gain results from undigested food that is stuck in the body.

Residue refers to undigested foods, including fiber, that make up stool.