Two scientists. One mission.
Together, Drs. Holly Wyatt and Jim Hill have spent 65+ combined years answering one question: how do real people keep the weight off in real life?
Dr. Holly Wyatt
Physician · Endocrinologist · Professor of Nutrition Sciences
Dr. Holly Wyatt is a physician, endocrinologist, and nationally recognized leader in weight loss and long-term weight management. With more than 25 years of clinical and research experience, she's helped thousands of people lose significant weight, keep it off, and transform their health.
Millions came to know her as the physician on ABC's Extreme Weight Loss, where she guided participants through dramatic real-world transformations. She also coauthored the bestselling book State of Slim and created the SOS programs, which give people science-based strategies to reset metabolism, manage appetite, and build a strong mindstate for success.
Dr. Wyatt serves as Professor of Nutrition Sciences, where she teaches the next generation of health professionals and leads research on what it really takes to maintain weight loss long-term. She's also the co-host of the Weight Loss and… podcast, where she translates science into practical strategies people can use right away.
Away from the classroom and camera, Holly is usually chasing after her blue-eyed merle pug, Bodie — a constant reminder that curiosity, energy, and joy matter as much as results.
Dr. James O. Hill
Obesity Researcher · Professor · Director, Nutrition Obesity Research Center
Dr. James O. Hill is one of the world's foremost obesity researchers, with more than 40 years of experience studying the science of weight regulation. He has published over 700 scientific articles, co-founded the National Weight Control Registry (the largest study of successful long-term weight loss maintainers), and recently co-founded the International Weight Control Registry.
He currently serves as Professor in the Department of Nutrition Sciences and directs the Nutrition Obesity Research Center (NORC). Dr. Hill has been continuously funded by the NIH since 1981, and his work has shaped how the world understands weight loss maintenance, metabolic health, and precision nutrition.
He is also the coauthor of The Step Diet Book and State of Slim, and a passionate advocate for science-based solutions that actually work in real life. Outside of research, Jim is an avid cyclist who brings the same focus and determination to long rides that he does to tackling the toughest questions in obesity science.
The science behind the Tribe
Holly and Jim co-lead two of the most significant long-term weight-maintenance research registries in the world — the data backbone behind everything we teach.
National Weight Control Registry
Co-founded 1994 · Drs. James O. Hill & Rena Wing
The largest prospective study of long-term successful weight-loss maintainers in the United States — over 10,000 members tracked for years to decades. The NWCR is the source of nearly everything we know about what actually works to keep weight off.
Visit registryInternational Weight Control Registry
Co-founded by Dr. James O. Hill
The global expansion of the NWCR — studying weight-loss maintenance across cultures, cuisines, and healthcare systems worldwide. A new generation of evidence about what makes maintenance possible anywhere on the planet.
Visit registryWhy they built the Energized Tribe
Holly and Jim bring decades of complementary expertise — blending Holly's hands-on, person-centered care with Jim's deep research into what actually predicts long-term success. The Tribe is where their science meets your daily life.
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