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I wonder if high sugar intake could be the common cause for both problems.

Or smoking cough.

Or class - which strongly correlates with diet and smoking along with education, mental stimulation through your occupation, medical care, etc.

The brain is fueled by glucose, so probably not.

Most of the sugar we ingest is not glucose. The sugars we eat get converted into glucose plus some nasty crap depending on what sugar is being converted, according to a video that was posted here a while back, but which I can't find right now...

Is it Sugar - The Bitter Truth: http://www.youtube.com/watch?v=dBnniua6-oM ?

That's it, thanks.

Also, the body can convert both fats and proteins into glucose if I'm not mistaken ...

Funny how there are both essential amino acids and essential fatty acids, which means that humans can not survive without dietary protein and dietary fat. There is absolutely no physiological requirement to consume carbohydrates though. (I'm not trying to say one should not consume those at all, just noting the fact).

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