* The hormones involved obviously include the ones we’ve already heard of, like insulin, leptin, CRH, and glucocorticoids, plus other players like growth hormone, estrogen, and testosterone. But there’s also an array of brand-new appetite-related hormones and neuro transmitters with names that are so hideous that I have no choice but to bury them in a footnote. Neuropeptide Y. Cholecystokinin. Melanocyte-stimulating hormone. Oleylethanolamide. Adiponectin. Hypocretin. Agouti-related protein. Ghrelin (yes, that’s actually how you spell it; however, I have no idea how you pronounce it).