Frankp,
Both the wife and I are IR, she is really pre-diabetic. I have lost weight with low carb-very low calorie diet i the past (from 230 to 165) but could not maintain the eating program they advised. I think your approach is the best I can find, and that's basically the WW menu. Congratulations on the weight loss and even more the marathon and triathlons. Good luck in the CM.