Like "The truth is that you cannot make him take care of his diabetes. You cannot absolutely control what he eats...it is his choice as to what he puts into his mouth and how much he exercises . What you can do is provide support and, if you are the cook in the household, provide him with healthier, lower carb food choices. Don't nag...he's an adult and is responsible for himself, even when he acts irresponsibly. While some "tough love" may be needed if you see him seriously make repeated bad decisions, it doesn't sound like you're there yet. As we age, our bodies react differently and adjustments have to be made through the years in how we manage and control our diabetes. "