A new study on fruit flies from Brown University researchers illuminates more of the role of insulin in the aging process. "Think of the body like a car. We knew insulin controlled the car's speed by regulating things like the gas pedal and the fuel injectors. Now we know that insulin is also the fuel that makes the engine go. So the research fits some key puzzle pieces together. And it should change the way we think about aging." Past research into calorie restriction has also pointed at insulin as part of a key regulatory mechanism for the aging process. The more we learn, the more we can learn - and the closer we come to effectively intervening in the aging process.