But just because you have a gym membership that you actually use doesnât mean you canât also have a few things at home for doing other types of workouts that you donât have time for at the gym, or for those days that you just canât make it out the front door.
The inside wall of the small intestine needs to be thin, with a really big surface area. This allows absorption to happen quickly and efficiently. If the small intestine had a thick wall and a small surface area, a lot of digested food might pass out of the body before it had a chance to be absorbed.
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.