Scientists have uncovered a surprising metabolic control system that reshapes how we think about weight gain and obesity. Credit: Shutterstock Our fat cells, known as adipocytes, do far more than store extra body weight. They serve as an important energy reserve for the body. Inside each adipocyte, fat is packed into lipid droplets that can be tapped when fuel is needed -- for example, during the hours between meals. To release this stored energy, the body relies on a protein called HSL, which