Oleanolic acid, a natural triterpenoid, improves blood glucose tolerance in normal mice and ameliorates visceral obesity in mice fed a high-fat diet - de Melo, C L; Queiroz, M G; Fonseca, S G; Bizerra, A M; Lemos, T L; Melo, T S; Santos, F A; Rao, V S (Chem Biol Interact, 2010)