does glp 1 show up in blood work GLP-1 Agonists - What is it? What Lab Tests Can You
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Or maybe it has nothing to do with GLP-1 receptors in the brain or metabolic pathways
It does not activate GIPR

[DOI] [PMC free article] [PubMed] 308.Lam, N

The inhibitory effects of peripheral administration of peptide YY(3-36) and glucagon-like peptide-1 on food intake are attenuated by ablation of the vagal-brainstem-hypothalamic pathway

It's a naturally occurring gut bacterium that lives on the intestinal mucus layer, and researchers have been studying its relationship to GLP-1 secretion in increasingly specific detail over the last several years