In general, the best time to exercise is when glucose peaks, about sixty to ninety minutes after eating. This timing provides enough energy, allows calories to be burned, and avoids high blood sugar after eating. Also important is to learn how to determine the right insulin dosages before, during, and after exercise. Why? Too much insulin before a workout can lead to too-low blood sugar, or hypoglycemia, while not enough insulin can cause too-high blood sugar, or hyperglycemia. Stress and heat can affect the blood glucose/insulin balance, so these factors must also be taken into account.
A good idea is to have some carbohydrates available during exercise in case blood sugar needs to be raised quickly. Eating carbohydrates helps to prevent hypoglycemia. And exercising with a partner who knows what to do in case of a diabetic emergency can add a safety factor as well as make exercise more fun.
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