A week ago, a new study reported a connection between diabetes and dementia. Apparently type 2 diabetics who crash badly enough to go to the hospital are more likely to develop dementia later in life. It sounds like crashing that badly must do some kind of damage to the brain to increase the risk of dementia.
I'm not sure why type 1 diabetics aren't included, as I would think crashing would be just as badly for us as it would be for type 2 diabetics. However, I suspect the only reason is because the study was only done on type 2 diabetics, so they can only report the findings of the study. I hope someone does a similar study on type 1 diabetics or on all diabetics, but in the meantime I think it's safe to say that you should avoid hypoglycemic episodes.
Studies like this one are good reminders that we don't know everything there is to know about diabetes — far from it. There could be many other complications that we still have yet to discover. To me, that just means that it's really important to keep my diabetes in good control. I don't want to "discover" a complication firsthand, thank you very much!