It sounds like a reasonable thing to do, but the problem is that insurance companies don't typically cover the cost of the diabetic testing supplies until you are officially diagnosed.
For now, the best thing you can do is try what ever you can do at home to watch your food and beverage intake. It won't be easy, so the best way to do that is to make small changes a little bit at a time. Otherwise, it's easier to go back to a person's usual lifestyle and diet. If you make small changes little by little, it will definitely be easier. The first thing I would do in your case is to do everything you can to not consume anything with obvious sugar. You can control some of the cravings with added water and add a gentle fiber, like Benefiber. Fiber is a healthy way to control appetite.
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