You're right a carb is a carb. I guess the thing is that when I'm craving sugar I don't think (sadly) "I need an orange!" I think, "I need 5 Lindt white chocolate truffles!"
But I know of course there's a lot of emotion involved in eating. I've been anorexic/bulimic. I used to weigh about 100 pounds back in '97... and I didn't get my period for like a year. I've also been 227 pounds. Happily, I've been somewhere in between those two for years and apparently my natural set point is somewhere around 155-- about 10 pounds away from where I am now.