Hi I am new so please bear with me. I have been a type 2 diabetic for 15 years and on insulin for 11 years. My sugar levels are now all over the place ranging from 3 to over 20. I have been asked to monitor my CHO levels but I am struggling to understand how to convert them. For example on waking today my level was 13.9 and I had a cup of tea and a glass of fresh orange juice and my level has now increased to 20 after 90 minutes. Would a glass of orange juice increase my level by this amount so quickly.