I don't know if this information is already out there, but if not, I want to be on cyber record as being one of the first proponents of this idea. I've been trying to lose weight recently, and my preferred post-dinner snacks of popcorn or ice cream were not aiding me in that pursuit. So, I started eating oranges at night if I got hungry.
Anyway, I noticed that, even if I wasn't all that hungry (often I would turn to the popcorn or ice cream out of boredom, probably like a lot of people), within an hour or so after eating the orange(s) I would get fairly hungry. And the next day I would lose weight--even if I'd had a heavy meal for dinner--or at least not put on weight.
Now, I'm no nutritionist, but with the increased hunger and the losing weight, I wonder if something in oranges kick-starts the metabolism? I'll keep this up and see how it goes.