in which body organ does most of the absorption of  nutrients take place
The Absorption of Food by the Human Body. Some nutrients begin breaking down in your mouth. Digestion and absorption begins in your mouth and ends when waste exits your colon. Food is fuel for your body and provides nutrients, which are broken down and absorbed during digestion. Components in foods, including carbohydrates, protein, fat, vitamins and minerals, each have their own function in your system and are metabolized in different ways.