Humans, mice — indeed all mammals — have two types of fat cells in their bodies; white and brown. White fat cells store energy. In contrast, brown fat cells dissipate energy as heat, thus counteracting obesity. Much to the chagrin of humans living in industrialized societies, most fat cells in our (adult) bodies are white fat cells. While this trait served our kind well throughout our evolutionary history, we now face a vast abundance of inexpensive, easily accessible, high energy content foods. This, combined with our body’s tendency to want to store up energy for times when food is scarce, leads to obesity and its accompanying adverse health effects. Wouldn’t it be great if we could have more brown fat cells and less white fat cells? (more…)