Mr. lybrate-user, Thanks for the query.
Diabetes is a hormone (Insulin) deficiency disorder. In addition there is resistance to its action. This condition can be very well controlled by drugs, diet
and exercise. But there is no permanent cure. There is no point worrying. If blood glucose levels are well controlled, then patient can live like any other normal person. It is necessary to maintain fasting glucose < 100 mg, PP 150 to 170 mg & HbA1c% <6.8. Since you have not mentioned any details about his blood glucose levels, HbA1c%, drugs being taken, weight, height, diet pattern and extent of daily exercise. There is no way to give any suggestions. Thanks.