@BADeMorte
The big question is which type of pre-diabetes. Do you have family history of adult-onset, non-insulin requiring diabetes? Are you overweight/inactive? If so, reduce weight, limit carbs, increase exercise, optimize other risk factors like smoking, cholesterol, blood pressure.
@BADeMorte
Many insurances will cover consultations with a dietician before you're actually diabetic. It's good to find out what your approximate calorie intake is now and how much your regular foods contribute. Fats have the most calories per gram, alcohol less, and proteins/carbohydrates least. However, you'll often find carbs are not nearly as enjoyable as they ought to be for the grams/calories (they're bulky). So they're good places to start to reduce quantities.
@AlphaCentauri I was thinking about talking to a dietician because mine will cover it. And thank you for the information. This was wonderful stuff.
@BADeMorte
Once you decide which calories are less important to you, you shave them off or you increase exercise to allow yourself to indulge. It's easier to exercise if you get to eat 100 more calories per mile.
Caveat: don't overlook calories in liquids. It takes many oranges to make 12 oz of orange juice. You're better off eating an orange and drinking water.