It may control what one eats,
https://www.smithsonianmag.com/science-nature/even-tiny-worms-get-the-munchies-180982020/?utm_source=smithsoniandaily&utm_medium=email&utm_campaign=editorial&spMailingID=48227663&spUserID=OTE5NDcwNzM1NjY3S0&spJobID=2442334756&spReportId=MjQ0MjMzNDc1NgS2
