Can I be a little blunt? With a high BMI you may well have a lot of internal fat surrounding vital organs and that isn't healthy even though you currently feel healthy. Also you are no doubt aware of the long-term health problems of high blood sugar. You don't say what your BS levels are so do check your levels if not already doing so and keep within the good range to stay healthy. The 'only' motivation for a diabetic to diet and have exercise is the thought of what will happen in the future if you don't : simples