A low carb diet worked for me as it does many others. As you are pre diabetic aiming for a moderate carb of less than 100g per day may be enough to push you back into normal range Hb1Ac. As far as the food to eat, you will find some useful threads on this website but do your own research as well. Low carb recipes are easy to find and they will usually state the total carbs so you can tailor them to your daily target. Frankly I have found switching to a low carb lifestyle has given me a new lease of life. I have lost weight and my health has improved in all sorts of ways quite apart from getting my blood sugar down.