Biological clocks (peripheral oscillators) in the liver, gut, and pancreas may be the reason for disruption of metabolism in people who work night shifts, according to a study in the Proceedings of the National Academy of Sciences. Working night shifts increases risk of obesity, diabetes, and other disorders.

Read more https://news.wsu.edu/2018/07/09/shift-work-disrupts-metabolism/ and access the study abstract http://www.pnas.org/content/early/2018/07/09/1801183115.