I had prediabetes 3 years ago and had burning feet and up to my knees, a change of diet, no sugery carbs, eat low GI , high fibre food, drank plenty of water, some exercise and Vitamin B & B12 has reversed my PN to a 98 % recovery.
I believe it can be done with frank Diabetes too.
There is a lot of good PN related reading in " the stickies ", thats on the front page up the top, well worth reading.