Physiology of Insulin In Man: The Banting Memorial Lecture 1971 | Diabetes
Low insulin levels, the “fasted” signal, initiate mobilization of stored fuels from tissue stores, the rate being proportional to the lowness of the insulin.
https://diabetesjournals.org/diabetes/article/20/12/785/4048/Physiology-of-Insulin-In-Man-The-Banting-Memorial