As mentioned above, if you have diabetes (type 1 or 2), you should consult your physician before trying intermittent fasting. One tiny study looked at 3 men who had type 2 diabetes for 10-25 years. They did an alternate day or periodic fasting under medical supervision and were able to stop taking insulin after 1 month. In addition, they were able to reduce or stop medications after 1 year. Again, this is a small study. Please consult with your physician before trying intermittent fasting if you have diabetes.