Robert H. Lustig is an American pediatric endocrinologist and professor emeritus of pediatrics in the division of endocrinology at the University of California, San Francisco (UCSF), where he has been a faculty member since 2001. He specializes in neuroendocrinology and childhood obesity, and directs UCSF's WATCH program (Weight Assessment for Teen and Child Health). Lustig is also the president and co-founder of the non-profit Institute for Responsible Nutrition.