Feeding-to-mating switch (IMAGE) University of California - San Diego Caption Male fruit flies rapidly switch from feeding to courtship behavior after consuming protein-rich food. Amino acids trigger the release of the neuropeptide Dh31 from the gut, which in turn activates Dh31R-expressing neurons in the brain to terminate feeding and initiate courtship through two parallel circuits. Credit Wang Lab, UC San Diego Usage Restrictions Must be used in conjunction with Nature paper on gut-to-brain communication. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.