How about Combat Flight Sims? Seems like pretty slim pickings lately. Mostly more Arcade style than proper Sims like Falcon. And what about Formula 1, is GP4 still the best that can be done?

To use your example of diabetics, I'm sure many people could learn to better listen to their bodies, especially with a training aid such as a real time read our of what they are trying to listen to.

I'm sure many people have certain "feelings" in their body, either moods, or energy levels, that are familiar to them, but they can't correlate it with hydration level, blood sugar, or 10s of other things that might affect how your body feels.

But with a read out, we could learn that "oh, that feeling means a lower than normal (for them) level of testosterone", with out looking at the meter, and know that its time to get some exercise in.

But calibrating your "feelings" is very difficult at present, with out lots of trial and error, or training in sport. This might lead to wider availability of an athlete's level of body awareness.