I am new to this diagnosis, so I am still learning what it means and how to deal with it. Anyway, I started taking the 500 mg dose of Metformin twice a day about two months ago. I was told to come in for a fasting glucose test, so I did. When the test was done I had not had anything to eat for twelve hours and was famished. I also had a headache that didn't disappear until after I had eaten. To my surprise the blood glucose level came back as high -- 170. How can it be that I was so hungry but the glucose level was high? That seems counter intuitive to me,