Hi
@koukla
My body's reaction to bread is similar. The BG rise with potato is much less. No idea why, but it is a big inconvenience!
There is also a thing that happens to type 2s, when we go really low carb, that may have influenced your high bread reading. It is basically (sorry, but I can't produce all the technical terms) where the pancreas gets out of practice at producing insulin. After a sustained period of low carbing. Then, when we do eat carbs (your slice of bread) our blood glucose rises higher than expected and takes a loooong time to return to normal. Because the lazy pancreas takes longer to react.
Some people suggest that this is one reason that very low carb isn't a good idea. Because it reduces the pancreas' ability to cope with carbs. I disagree (mainly because low carbing really works for me in so many other ways). I prefer to look on it as giving my pancreas a nice rest, by not expecting it to produce insulin.
The good news is that IF this 'lazy pancreas' is what is happening to you, then your pancreas would stop being lazy, if you gently upped your carb intake, slowly, over several days. You would have a few days of higher than expected readings, then your pancreas would be back in business, and your readings would become more normal, because your insulin production would be less 'lazy'.
Please understand: I am NOT telling you that you HAVE a lazy pancreas. I am offering it as a possible explanation.