Calsyntenin proteins orchestrate collective food-sharing behavior in C. elegans worms, causing them to cluster at food boundaries rather than dispersing optimally. This neural mechanism appears counterproductive for individual feeding efficiency but may serve evolutionary functions related to information sharing and collective survival strategies. The finding extends our understanding of how ancient neural circuits govern social behaviors across species. Calsyntenins are highly conserved proteins found in human brains, where they influence synaptic function and have been implicated in autism spectrum disorders and Alzheimer's disease. This research suggests that fundamental social coordination mechanisms evolved early and persist across vastly different nervous systems. The worm model offers unprecedented precision for mapping how specific molecular pathways translate environmental cues into collective behavioral responses. While the immediate health applications are limited, understanding these conserved neural mechanisms could illuminate why humans exhibit seemingly irrational group behaviors around food and resources. The work provides a tractable experimental system for investigating how brain chemistry influences social decision-making, potentially informing therapeutic approaches for conditions where social behavior regulation is disrupted.