When I took a buyout (forced retirement, but fair) at the same time my father was dying of cancer, I quit exercising and started eating, gaining 40 pounds. My glucose had been in the 80s at age 62, but it shot up to the 120 range. One of the ways I got back under control was with a moderate diet and LOTS of riding, 8,000 to 10,000 calories a week according to a good software program. Riding that much, I could still eat pretty well and take off the weight. Glucose has stayed around 105 (110 is normal in our local lab) since then, but it does edge up if I gain weight. I don't know to what degree the bike contributed, but if nothing else, it made the weight loss possible.