It is most likely the balanced diet - based on the false assertion that we need carbohydrates. The 'information' about the dangers or eating fatty foods is also somewhat problematic, as going low fat started whole populations on the road to obesity and ill health.
There is no need to lose weight to reverse diabetes, as you can eat meat, seafood, eggs, cheese, nuts, full fat yoghurt, all sorts of low carb veges and have berries with cream, and also put cream in your coffee. You might change shape, even feel stronger and by adjusting carbs so that your blood glucose is not spiked, things ought to improve.