Thank you Rosemary. I also have glumerulonephritis, a chronic kidney disease. I've been on steroid prednisone for the past 10 years now. Though my glucose had always been below the maximum 99 mg/dL, I am prediabetic. Both my nephrologist and rheumatologist told me that my HA1C is elevated due to the steroid I am taking. My internist mentioned D mannose to me, has not increased my glucose level though. But I exercise at least 3x a week so as to counter any rise in my blood sugar.
I suggest to consult your doctor before taking D mannose. What works for one does not mean it will always work for everyone else.