Doctor can't cure his own diabetes

I developed diabetes twice 4 years ago and cured myself with weight loss. This time I got diabetes 2 years ago but have not been able to cure it. I have had the best success with a low carb diet but my nutritionist gets upset when I go on that diet. I have a personal trainer that focuses on pilates and that has helped with reducing body fat but my diabetes continues. My wife and friends say it is because of all the sweets I eat. They are right. I have become more empathetic towards my patients because I know how hard it is to check your sugar and take your medications regularly.
Doc