FFAR2 and immune system disorder: SCFAs activate G-specific protein-coupled receptors (GPRs), where GPR41 (known as free fatty acid receptor 3) and GPR43 (free fatty acid receptor 2) have been related to a wide health effect of antitumor and anti-inflammatory benefits on the colon, protection against the development of immune disorders, obesity control, glucose homeostasis control, appetite regulation, and cardiovascular effects [45,57,59].