Another thing - I've just 'restarted' McDougalling after a long lapse, and I WAS hungry the first couple days (actually, I'm really hungry today, too, but i think that's because I forgot to eat breakfast and then my children distracted me halfway through lunch. I'll go eat some fruit, LOL)
I would wake UP hungry ... which was unusual. I think it was because my metabolism was working harder. At least, I like to think so.
That burning up all those healthy carbs was keeping it busy and it was ready for more!
I do think the the difference between "satisfied" and "full" is key ~ and you could be not hungry (satisfied) but dissatisfied in the tastes, still wanting something else, it might take awhile to learn what really satisfies your cravings, not just your hunger ... for me, I can never eat enough crunchy snacky food, even when I'm *full* (stomach stuffed) and not hungry anymore, I can still crave more. I think I just need to unlearn that.
ANYway, my point is ... think of being hungry as a good thing, as sign that your body is burning burning burning those good foods.