How else can I control insulin resistance?

I have been diagnosed with insulin resistance. I am a 60 year old female, very physically fit, eat very healthy, no simple carbohydrates such as white bread, pasta, rice or anything with sugar and exercise 5-6 times a week for 1-2 hours each time with a combination of cardio and weight training. I take 100 ml of Januvia every morning but I still have a fasting blood glucose of 120-140 each morning. I don't know what else I can do.