Hi, i fixed my prediabetic state by having no sugar at all and a sensible diet, with lots of high fibre foods.
I didn't know i had prediabetes until i got nerve damage [ burning feet ] it was Peripheral Neuropathy, i was lucky my neuro found it through a 3 hour glucose tolerance test and these days i am nearly cured of that awfull disease.
good luck with it all,
Brian