23rd November 2012
What makes this possible? Scientists have long known that a hormone called ghrelin, which is produced by cells lining the stomach, plays a role in inducing appetite. A counterpart hormone called leptin, which produced in fat cells and other types of tissue, suppresses appetite. When levels of ghrelin in the bloodstream are high, we feel hungry; after eating, ghrelin levels drop off and leptin levels increase, signaling to our brain that we’re full. That, anyway, is how it’s supposed to work.