You may want to check out the Master-Cleanse forum - there may be people there who are more knowledged to answer you. I am a type II diabetic. However, when I started the MC, my hemoglobin A1C was 5.8 (quite stable). I can tell you that one serving of lemonade is about 20g of carbs (in the maple syrup). Have you read the book? The book recommends black molasses for people with diabetes. Since I cannot stand molasses, I chose maple syrup. Once I completed the MC, my blood Sugar and blood pressure leveled itself out - of course, I had to continue to watch my diet and health, but it was an amazing change for me. I also flushed my liver for the first time and that seems to have had an amazing affect on my health as well. Good luck to you and your sister!