Originally Posted by
Jughed
My question/point - how do you know? The only way that sugar becomes energy, gets out of the blood into the muscle/organs is insulin. The more sugar you take, the more insulin is required. If not - it sits in your blood stream. How do you know how much insulin you are producing - on the bike?
For a relatively modest outlay, you can test it for yourself in real-time with a blood glucose monitor. Even relatively moderate exercise blunts blood sugar spikes significantly.
One thing to avoid is taking on simple carbs in the hour before starting your workout as that will trigger a spike and subsequent dip in your blood sugar when you least want it. So either eat 3 hours before, so that your blood sugar has returned to fasted level or take on the carbs once you are warmed up during your workout. On a long ride I usually start fuelling after about 30-45 mins on the bike if I need more energy for later in the ride.