If he doesn't, then he can't blame them on diabetes
. Having low blood sugars does affect the way the brain
works. The brain requires glucose to function properly, which is why someone who is hypoglycemic has balance issues and often doesn't remember severe lows. Personally, I don't think what you're seeing has anything to do with diabetes. If he is otherwise able to function, isn't having lows at the time of the memory lapse, then it isn't diabetes that are causing those problems.