“…Glucagon-like peptide 1 (GLP-1) and glucose-dependent insulinotropic polypeptide, also known as gastric inhibitory polypeptide (GIP), are endogenous gut-brain peptides that function both as a hormone and neuropeptide and are released from intestinal L-cells and K-cells, respectively, in response to food intake in humans and mice ( Adner and Nygren, 1992 ; Dalgaard et al, 2004 ; Alvarez et al, 2005 ; Pannacciulli et al, 2007 ; Seino et al, 2010 ; Seino and Yabe, 2013 ; Abraham et al, 2015 ; Jerlhag, 2020 ; Marty et al, 2020 ; Eren-Yazicioglu et al, 2021 ). They stimulate glucose-induced insulin secretion, inhibit glucagon secretion, and decrease appetite in humans and mice ( Adner and Nygren, 1992 ; Dalgaard et al, 2004 ; Seino et al, 2010 ; Underwood et al, 2010 ; Seino and Yabe, 2013 ; Abraham et al, 2015 ; Klausen et al, 2022 ). They have the ability to travel across the blood-brain barrier and access the nervous system in humans and rats ( Isbil-Buyukcoskun et al, 2009 ; Eren-Yazicioglu et al, 2021 ).…”