Here's a neat trick: consuming a glass of water can help to resolve the symptoms of hypoglycemia. (Short term) In other words, you've reached T.O.D. and you're starting to "bonk". No nourishment is available or you don't have the time due to pace of OPS, consume some water.
Cheers,
DAN
LJDRVR
P.S.- b55. If you need a reference source for physiology to develop a human factors curriculum, I highly recommend
"FIT TO FLY, A PILOT'S GUIDE TO HEALTH & SAFETY." By Richard O. Reinhart, M.D. (ISBN 0-8306-2059-1)