Paul Andersen describes the major parts and macromolecules of the digestive system. A 9:39 minute YouTube video.

The definitions of anabolic and catabolic reactions in metabolism in a 3:57 minute YouTube video from thenewboston.

A 2:32 minute explanation of enzyme regulation in metabolism from Technology in Education.

Researcher Jeffrey Gordon at Washington University talks about his 2013 study. A 12 minute audio file from Science Friday.

A recent study suggests that people who have diabetes type 2 have an abnormality in receptors in the small intestine, affecting feedback on the amount of glucose present. A 2013 article from e! Science News.

Researchers at the University of Alberta have completed a seven years study of the more than 3000 metabolites that can be found in urine. The data should make it possible to do develop many more diagnostic tests than we have currently. A 2013 article from e! Science News.