William Hsu, MD

Dr. William Hsu is a leading endocrinologist and innovator in metabolic health with more than two decades of experience at the forefront of diabetes care. After 20 years at Harvard's Joslin Diabetes Center—where he served as Vice President and led global advisory initiatives across 12 countries—Dr. Hsu joined L-Nutra in 2019 as Chief Medical Officer to drive forward a new paradigm in chronic disease care.

At L-Nutra, Dr. Hsu leads clinical strategy, medical and scientific affairs, and the development of L-Nutra Health, a groundbreaking division focused on the remission and regression of type 2 diabetes using nutrition-based therapeutic approaches, including the Fasting Mimicking Diet (FMD). His vision: to reduce reliance on medications by harnessing the body's innate capacity for repair and metabolic restoration.

Dr. Hsu has played a pivotal role in shaping national standards of diabetes care through his service on multiple American Diabetes Association committees. His research has explored the pathophysiology of diabetes and the role of digital health technologies in managing chronic disease.

He earned his medical degree from the Icahn School of Medicine at Mount Sinai, completed his internal medicine residency at Yale School of Medicine, and trained in endocrinology and metabolism at Harvard Medical School, where he also served as Assistant Professor of Medicine.