Not always.  We both have read numerous posts from @highpull on Testosterone Nation and for some of his patients, testosterone, alone, resulted in their glucose normalizing and BP normalizing.  Dr. Neal Rouzier has made similar statements.  Also, Dr. Edward Lichten, who endured legal action because he was treating men who had diabetes, with testosterone.

My wife has strictly followed the recommendation of her doctors for the past 20 years, losing 30 pounds, taking Metformin and glipizide, watching her diet and exercising.  Her diabetes has worsened.  Tresiba, an insulin pen, is now part of her routine and her blood sugar still isn't well controlled.  I eat high carbs including sugar and raw honey and my fasting/post prandial readings have gone to normal. See Matt Stone/180degreehealth.com .