People over 40 who use aerobic exercise to prevent or control diabetes need not only regular but frequent exercise if they are to realize its potential benefits, according to a Mayo Clinic study. The study found that middle-aged and older people don't sustain the increased insulin sensitivity that aerobic exercise produces. Younger people, on the other hand, were found to maintain higher insulin sensitivity even four days after their last workout.
Just as I have said for some time now it is important to pay your exercise debt if you are overweight. Working out three times a week just isn't enough to cut it for most of us who are older than 40 and not in shape.
Diabetes August 2003;52(8):1888-96