I am actually interested in this as well... An answer from someone in the know (like steve) would be excellent... Every time that I get into serious training, I turn into an unpredictable jerk (like now), where I could snap on people for the stupidest of reasons. I always just figured that it was my increased testosterone levels due to my lifting, but that always seemed like a cop-out answer.

Maybe I'm just naturally a jerk, and when I'm running around with low blood sugar I just don't like taking anyone's garbage... but there HAS to have been studdies done on this... and if one person can find an obscure medical reference, I'd bet its the guy that rhymes with "Reeve"

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Do you spend your days counting the hours you're awake
and when night covers the sky you find yourself doing the same
MH4L