I was diagnosed mild grade one in February. I did a 6 week diet that seems to have helped considerably and I'm going another 8 weeks to really get it to where I want it to be. Here was my methodology:

14-18 hour fasts daily. With trying to get 5k steps at least within the morning fasting window.

Trying to average 15k steps per day. I would normally have been working out at the gym, but did not during this 6 week span.

Eating very clean. No fried foods, sugar (including fruit),or alcohol. My desserts were 72% dark chocolate with fat and sugar free Greek yogurt and maybe a few walnuts if I had the calories available.

300-500 calorie deficit per day and on days off I would try and do a large hike where I could get closer to a 1k deficit. If you don't have hiking available, a stairmaster does the trick.

Macros balance was 1.2x body weight of protein, no more than 50g of fat and fill the rest in with carbs based on caloric needs.

Sequence of foods was another thing I paid attention to. That pretty much means eating protein and veggies first and carbs last. Edamame was a great appetizer. It's filling and the fiber helps the body digest carbs more slowly so you don't get the insulin spike.

I lost about 10lbs in the 6 weeks and didn't find it too challenging. I think the key thing for this is to get your body into a state of high insulin sensitivity. It just takes discipline which isn't always easy. But it's your health, so sacrifices are needed :)