New gut-brain circuit redirects cravings toward protein when deficient
Researchers identified a gut-brain signaling system that detects protein shortages and shifts cravings toward essential amino acids rather than increasing overall hunger. In fruit flies, the enterocyte-released peptide CNMa triggers fast neural signals and a slower hormonal signal to boost amino-acid intake while dampening sugar cravings; gut microbes also modulate this pathway, and mice show a similar protein-seeking response, suggesting evolutionary conservation. The findings point to new targets for obesity and metabolic disorders by leveraging natural nutrient-sensing signals beyond known gut hormones.
