Briefly, the terms “melanocortin 4 receptor,” “MC4R,” “leptin receptor,” “LEPR,” “proopiomelanocortin,” “POMC,” “Bardet-Biedl syndrome,” “BBS,” and/or “PCSK1” were used in combination with “obesity” with the case reports filter applied to identify studies reporting on patients with hyperphagia in populations of interest. This evidence concerns the gene MC4R and Bardet-Biedl syndrome.