Say, the case is that either you finish this project or you're fired. (Or you do the project or lose a client.) You're perfectly aware about your glucose addiction . The choices are 1) to quickly eliminate sugar crash by eating sugar snacks or 2) to survive it, but suffer decreased productivity for some time. The consequences of choosing 2 might be the complete inability to afford good food (nuts are pricey) and general long-term stress caused by financial problems.
I'd be glad if someone would prove me I'm misguided by my sugar-dependent brain with the above example.
 Which may come from refined sugars according to http://www.ehow.com/how_2079526_avoid-refined-sugars.html, please correct in case I'm wrong.