First line of defense would be weight loss (if appropriate) and exercise, These are considered the best treatments for restoring the body's ability to respond to insulin normally. Dietary-wise I'd recommend a anti-inflammatory Mediterranean style diet that is low in processed carbs, higher in healthy fats and lean protein and most importantly low in sugar.
Here are some recipes that will help keep blood sugar levels more normalized. https://www.nutriliving.com/search/blood+sugar
And anti-inflammatory foods: https://www.nutriliving.com/blog/top-10-anti-inflammatory-foods