Among the tissues and organs crucial in regulating glucose and lipid metabolism, pancreas, brain, and adipocytes express GIP receptors (GIPRs), while pancreas, brain, and gastrointestinal tract are rich in GLP-1 receptors (GLP-1Rs) (40)
Exenatide, the human version of Exendin-4, has a short half-life and has not shown efficacy in human trials for addiction
Calpena E, Deshpande AA, Yap S, Kumar A, Manning NJ, Bachhawat AK, Espinos C
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How GLP-1s Work in the Body Slow gastric emptying (food stays in the stomach longer) Increase satiety signals to the brain Reduce appetite and overall intake Improve insulin response and glycemic control While these effects support metabolic health, slower digestion is also what sets the stage for GI symptoms, including reflux. Digestive Impact of GLP-1s: What the Research Shows Increased Upper GI Symptoms One of the most consistent findings across GLP-1 clinical trials is the high rate of gastrointestinal side effects