Here's a new study showing that reversal of type 2 diabetes using a diet change can work long term:
Science Daily: Reverse Your Diabetes: You Can Stay Diabetes-Free Long-Term Diabetes Care: Type 2 Diabetes Etiology and ReversibilityOf course eating very little food works - like the meal replacement diet shakes in this study. But the greatest thing is that they are not even necessary.
Just avoiding the carbs, and perhaps adding some intermittent fasting, can let people keep eating real food and still reverse their type 2 diabetes.