4 years ago, I was diagnosed as a Type 2 non-insulin dependent diabetic. The doctor said that it was still within my control to avoid having it get worse, but I had to do the right things. He instructed me to clean up my diet and get on the ball with exercise. I bought a road bike and starting cycling 15 miles daily to work and back instead of driving. Instantly eliminated from my consumption were sugar in all forms, potato, white flour, white rice, white pasta, and alcoholic beverages. He said that a cheat or 2 per month would be okay as long as my day-in, day-out routine is clean. I'll indulge in a margarita or some wine once a month, but that's about it. I take metformin 500 mg. daily. My blood sugar levels are consistently around 125 - 130 with 110 or below being the target. By eliminating the refined carbs, I dropped 65 pounds 4 years ago and have kept it off. Discipline and self-control are things that I have to always be aware of as I want to stay as healthy as possible for the remainder of my years. The cool thing about the bike is that I really got into it as a substitute for running and like to do 25 mile and 50 mile cycling events. I'm not the fastest guy out there, but the important thing is that I do it.
One other thought: When I was my most obese, I had a difficult time getting it up, keeping it up, and getting off. I thought it was from getting older. As I became healthier from the improved diet and exercise, I was once again able to perform sexually like I did in my 20s, 30s, and 40s. Nice to know that the equipment still works!