If you’re pre-diabetic means you’re not on insulin yet. Get one of Jason Fungs books or watch his you-tube videos. Intermittent fasting is the way to go. Try different diets - keto, carnivore, low carb and of course fasting. Jason Fung gives helpful hints on fasting so you don’t get scared or frustrated. And how to do it safely.
Thanks. I do have Jason Fung’s book, The Obesity Code. I only read the first few pages a year ago. I have it in front of me now.