Founded in 1861, the University of Washington is one of the oldest state-supported institutions of higher education on the West Coast and is one of the preeminent research universities in the world. Learn more
At the University of Washington, we are committed to supporting our students' development: intellectually, physically and emotionally. Learn more about Student Life
Exceptional learning opportunities are around every corner. Our students have gone to the moon. Mapped the human genome. Broken the sound barrier. Created vaccines. Negotiated peace. What amazing things will UW grads do next? Read more
The University of Washington recruits the best, most diverse and innovative faculty and staff from around the world, encouraging a vibrant intellectual community for our students. We promote access to excellence and strive to inspire through education. Vision & Values
No matter where you are, Husky Happy Hours are a great way to plug into the University of Washington's strong network of alumni. Connect with UW grads in a casual setting and meet fellow alumni in your area. Details
The first evidence, reported today, of structural changes in the brains of rodents and humans with diet-induced obesity may help explain one of the most vexing problems of body weight control.
Dr. Michael W. Schwartz, professor of medicine at the University of Washington, is the senior author of the study.
The well-established tendency to regain weight lost through dieting and exercise, as re-confirmed by a prominent Australian study earlier this year, is the single largest obstacle to successful obesity treatment. Body weight is controlled by complex interactions between hormones and neurons in a brain area known as the hypothalamus. These interactions influence appetite and food intake and , in most obese people, conspire to prevent permanent weight loss.
“Obese individuals,” said Schwartz, “are biologically defending their elevated body weight.” The mechanism for this phenomenon is the object of intense investigation by neuroendocrinologists.
Schwartz said, “To explain a biologically elevated body weight ‘set-point,’ investigators in the field have speculated about the existence of fundamental changes to brain neurocircuits that control energy balance. Our findings are the first to offer direct evidence of such a structural change, and they include evidence in humans as well as in mice and rats.”
His group studied the results of a high-fat diet in the brains of mice and rats that were bred to become obese on this diet. They found evidence of very early and lasting injury to a specific part of the hypothalamus in these animals. Using brain imaging, they also found signs of similar damage in the same area of the brain in obese humans.
“We did not prove cause and effect between the hypothalamic neuron injury and defense of elevated body weight - that comes next - but this amounts to solid evidence of a change affecting the key hypothalamic area for body weight control with the potential to explain the problem,” said Schwartz.
Dr. Josh Thaler, assistant professor of medicine, is the first author of the paper, which will be published in the January 3 issue of Journal of Clinical Investigation and is entitled “Obesity Is Associated with Hypothalamic Injury in Rodents and Humans.”Co-authors include Ellen A. Schur, Stephan J. Guyenet, Bang H. Hwang, Xiaolin Zhao, David A. Sarruf, T. Nguyen, Jonathan Fischer, Miles. E. Matsen, Brente E. Wisse, Gregory Morton , Denis G. Baskin, and their colleagues in the UW Department of Radiology and at Yale and the University of Cincinnati.
Schwartz holds the Robert H. Williams Endowed Chair in Medicine in the Division of Metabolism, Endocrinology and Nutrition. He is head of the Section of Clinical Nutrition and founding director of the UW Medicine Diabetes and Obesity Center of Excellence. He is principal investigator for a $4 million program grant from the Life Sciences Development Fund to support the UW Medicine Diabetes-Stem Cell Program. This is an interdisciplinary effort to develop innovative technologies that will overcome existing barriers to successful cell-based treatments for type 1 diabetes.
Subscribe to News
