What part of the small intestines are the nutrients absorbed?

Jejunum

The middle section of the small intestine carries food through rapidly, with wave-like muscle contractions, towards the ileum. Ileum: This last section is the longest part of your small intestine. The ileum is where most of the nutrients from your food are absorbed before emptying into the large intestine.

not only is it colder, it also becomes darker, less salty, and more dense.