Circulating levels of ghrelin and GLP-1 are inversely related during glucose ingestion. - Djurhuus,C.B.; Hansen,T.K.; Gravholt,C.; Orskov,L.; Hosoda,H.; Kangawa,K.; Jorgensen,J.O.; Holst,J.J.; Schmitz,O. (Horm Metab Res, 2002)