1. Barrett, K. E., Barman, S. M., Brooks, H. L. and Yuan, J. Ganong’s Review of Medical Physiology 26th edn. 475–476 (McGraw-Hill Medical, 2019).
2. Hall, J. E. Guyton and Hall Textbook of Medical Physiology 13th edn., 835–841 (Elsevier, 2016).
3. Koeppen, B. M. & Stanton, B. A. Berne & Levy Physiology 7th edn., 551–553 (Elsevier, 2018).
4. Alberti, K. G. M. M., Zimmet, P. & Shaw, J. The metabolic syndrome—a new worldwide definition. Lancet 366, 1059–1062 (2005).
5. Mourad, F. H. & Saade, N. E. Neural regulation of intestinal nutrient absorption. Prog. Neurobiol. 95, 149–162 (2011).