My husband recognises two basic food groups: cheese, and things on which to put cheese. He has Type 1 diabetes (the genetic kind). I have no idea how he is still alive.

On the other hand, we're a geek marriage that has worked pretty well - possibly because we both don't like mind-game bullshit and have some shade of autism, so we tend to talk things over in a reasonable way and try to find solutions instead of waiting for the other person to guess what's wrong.