Could you please cite your sources for this theory?
I've been eating low carb, 30-35 carbs daily, for three years. It has definitely increased my insulin sensitity. Why would taking less insulin adversely effect this? It's larger insulin doses that cause insulin resistance,
I disagree that low carb can't be maintained long. I also disagree that any diabetic needs beans. My carbs come from vegetables, nuts, seeds & nut flours. No lack of fiber there. There are also other ways to get soluble & insoluble fiber without increasing carbs from inulin, xanthan gum & glucomanan. My diet is quite healthy & varied without beans, grains, or starchy vegetables.
Since about 58% of protein converts to glucose, there's no lack of glucose eating low carb. After three years, my body has become quite efficient at the conversion.