Hormone Fights Fat With Fat: Orexin Prevents Obesity in Mice by Activating Calorie-Burning Brown Fat, Sanford-Burnham Medical Research Institute Study

Published: Oct 05, 2011

The fat we typically think of as body fat is called white fat. But there's another type -- known as brown fat -- that does more than just store fat. It burns fat. Scientists used to think that brown fat disappeared after infancy, but recent advances in imaging technology led to its rediscovery in adult humans. Because brown fat is so full of blood vessels and mitochondria -- that's what makes it brown -- it's very good at converting calories into energy, a process that malfunctions in obesity.

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