I discovered via self-tracking that I could get my fasting blood sugar much closer to optimal by walking an hour per day. This took me a year to figure out and I discovered it by accident. Phil commented that I could have learned the same thing more quickly by searching websites or asking my doctor.
Whether I was rediscovering the fairly obvious is important to me. This website by Janet Ruhl, who has diabetes, is named “How to get your blood sugar under control”. Its advice says nothing about exercise, much less walking. Here’s one reason why:
I [Ruhl] currently control my own diabetes using a fairly low carbohydrate diet and very low doses of fast acting insulin at meal time. . . . At one point I exercised daily for a year and got my body fat down to 24%, which put me into the “Fitness” category for a woman my age. Despite what my doctors had told me, weight loss and intense fitness didn’t do a thing for my blood sugars, which got worse.
Emphasis added. I too did recommended amounts of aerobic exercise. I too found my blood sugar was nevertheless unpleasantly high. The usual recommendation of aerobic exercise may make it less likely you will do the long low-intensity exercise (ordinary walking) that my results suggest works. You may think: I’ve already exercised. I’m tired.