Hi, welcome to our site. I am Dr Saumya Mittal. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query I think you should have mentioned his sugar levels and HbA1C. That could have told us the kind of control there is. His age, height, weight and other medical and treatment history is advisable. i suggest you do a good sugar monitoring (as below), and get back to us- check 3 premeal sugars- fasting, prelunch, predinner. These should be done half hour prior to meals. Check sugars post meals (2 hours after breakfast, lunch, and dinner). Make a note of the insulin taken at each meal. If you let us know the kidney functions, that would be helpful too. I hope this helps you. Inform the reports mentioned above so i can be of help further. Best of luck. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. (If the answer has helped you, please indicate this)