Because if you start exercising or eating NOW the insulin administered won't start working for 30 min and won't peak for 90-120 minutes. Because food hits you f

Because if you start exercising or eating NOW the insulin administered won't start working for 30 min and won't peak for 90-120 minutes. Because food hits you fast and by the time the system notices you'll have already drifted "out of the lanes." Diabetes Closed Loops are the same problem as controlling the Mars Rover. You move the joystick and nothing happens for x minutes. Then you wait another x minutes to observe the results.