I was classed as prediabetic but treat myself the same as a person with Diabetes 2 would, i don't touch potatoe at all, i love to eat it but it has a terrible affect on my blood sugars, so does white bread.
Instead of potatoe i choose cauliflower and only use very high fibre seeded bread but limit myself to only 2 slices a day.
It's very easy to slip into a diabetic range from a prediabetic state, so the amount and what you you eat is very important, especially if inactive.
My feet were very numb especially on the soles but through tight glucose control and exercise i have regained a lot of feeling back in them.
Good luck
Brian