An international team led by Dana-Farber Cancer Institute scientists has described in detail a new kind of fat, called “beige fat,” that burns calories, rather than stores them. They have also shown that this energy-burning fat exists in adult humans, and are searching for ways to turn on such fat cells to combat obesity and diabetes. Bruce Spiegelman, the Stanley J. Korsmeyer Professor of Cell Biology and Medicine at Dana-Farber Cancer Institute, led the research. C. Ronald Kahn, the Mary K. Iacocca Professor of Medicine at Joslin Diabetes Center, is also quoted.