RTA, i said this back on page 2, and you have found the reference for it.
(b) the pilot has had the opportunity to take adequate sustenance; and
I say again that along with ensuring the opportunity is provided, and that would be at an appropriate time, if an opportunity can't be provided, then a meal should be provided. Not necessarioly a three course feast, but a basic meal that will keep the sugar levle up.
Now there are people who have critica lsugar levels; at the extreme of that are diabetes sufferers, and if you've ever seen one of them hanging out, doing all sorts of irrational things, then you would agree that taking food atan appropriate time is most important. I have a friend who has a cirtical sugar level, and when he's approaching it, pity helop anybody who crosses him. His behaviour is no longer voluntary; its driven by his low sugar level, and it's not nice to be around. Of course he recognizes the symptoms and has something to eat way short of that....most times.