White Fat vs Brown Fat (IMAGE) University of Pennsylvania School of Medicine Caption White fat stores energy, while brown fat dissipates energy by producing heat, mediated by uncoupling protein 1, or UCP1. Credit Ray Soccio, MD, PhD, Perelman School of Medicine, University of Pennsylvania Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.