I am on insulin but most definitely yes........there are days like that.....I am having one today as well....
dosed up for lunch, 20 minutes before eating at 12:00pm.......was a tad high before eating, 8.2, then at 14:30pn, up in the 20s.....not happy....
just cant pin point what it was.......was the fruit I had riper than normal.....who knows......likely just one of those days, tired or stressed out which in turn could result in a release of several hormones that work against our BG management....