Had a problem with blood sugar several years ago when in for my class1- the litmus paper went above the line apparently.......probably shouldn't have had the feed of KFC in the car on the way.
Anyway, a couple of weeks with no sugar, no white bread, no potatoes, the subsequent blood test showed absolutely no problems with blood sugar.
The good news was that the Dr advising me said there was no need to curtail my moderate (adequate) alcohol consumption.
