You absolutely don’t need such caloric restriction to revert diabetes. All it takes is a very low carb or keto diet. Even without exercise.
1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5466941/
2. https://www.omicsonline.org/open-access/diabetes-reversal-by...
The person that invents a pill to trick our genes not to seek what was once rare (fat, sweets, carbs etc) will be a trillionaire. When our current genes were stamped "we" maybe had to hunt for days to eat once. Now we drive to McDonalds, order our or open the fridge door. Maybe something that puts our metabolism on steroids?