"Insulin is fundamentally a good thing – it helps our bodies to extract energy from the sugar we eat. However, if you don't work this energy off, insulin promotes the body to store the excess as fat."
He doesn't explain Sir Steve Redgrave, quite clearly burning off the energy he consumed. Or John Anderson, a lifelong runner and athlete before his type II diagnosis. Billy Jean King a fairly active tennis player, must have put the training hours in, and consumed the calories, diagnosed type II aged 63. I think the statement from the Telegraph is lacking something.