CHAPEL HILL – Exenatide, a drug that is a synthetic form of a substance found in Gila monster saliva, led to healthy sustained glucose levels and progressive weight loss among people with type 2 diabetes who took part in a three-year study.“The weight loss factor is important because being overweight and weight gain is an almost universal problem for people with diabetes,” said John Buse, M.D., Ph.D., lead researcher in the study and chief of endocrinology in the University of North Carolina at Chapel Hill School of Medicine.