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.
Some nutrients are absorbed in the stomach, but nutrients are absorbed mainly in the small intestine, where the small, soluble molecules are diffused or actively transported from the ileum/duodenum, into the capillaries on the other side of the intestine. Most food absorption takes place in the small intestine.