Ten-second science lesson for beginners: We get hungry (and feel full) because of hormones in our body, most notably four: Leptin – regulates appetite and metabolism, tells us when we’re “full” Ghrelin – tells us we’re hungry (stress and lack of sleep can alter ghrelin and increase hunger, FYI) Adiponectin – Another “I’m full” hormone Peptide YY — Another “I’m full” hormone
