Whilst I strongly support the fact that all the airlines should provide proper meals to their crew, it is also true that if You do not have any food with You (forgot/left it in the car/last minute stby scramble call) and the airline does not provide it (profit baby) You have to mitigate the adverse effects of low blood sugar by buying some sort of edible junk on board together with a couple bottles of water. I know it is damn annoying and You start swearing as loud as You can but You have to do something about it anyway. By the way, is it confirmed the the poor chap fainted as a result of low blood sugar/thirst ?