GP's do not normally carry out Oral Glucose Tolerance Tests for Type 2 (particularly at the moment) as to do it properly involves sitting in the waiting room for 2 hours. Even if they did it is very difficult to know if the rise in blood glucose is due to poor insulin production or insulin resistance. If anyone has been on a low carb diet they are supposed to eat carbs for a few days before the test to re-accustom their pancreas to producing sufficient insulin. The same would apply to your boiled potatoes and rice pudding test. The Magnetic Resonance Imaging that Prof Taylor uses will show a picture of the fat accumulated in the pancreas but it does not show if the beta cells are working at their full capacity. With those diagnosed in later years, 68 in my case, it may be that the pancreas is just not working as well as it used to, after all eyesight deteriorates, muscles and joints are not what they were. Losing weight, by whatever means, probably helps by lessening the resistance to whatever insulin is being produced particularly if the loss is from fat in the liver or pancreas but you can't conclude that the beta cells are back to normal.