Absorption
Different food stuff is absorbed at different parts of the digestive system. See table below for list of where substances are absorbed.
| Region of digestive system | Substance absorbed |
| Mouth | Alcohol, salts, vitamin C |
| Stomach | Alcohol, salts, simple sugars and soluble vitamins |
| Small intestine | Amino acids, simple sugars, soluble fats, vitamin |
| Large intestine | Minerals, vitamins and water |