This question may make it out to sound like I am discouraged, but I am just curious...
I have been thinner, but never so thin that I would have been thought of as skinny. I am not thinking that I want to ever be runway model skinny, but are most people in the skinny category always walking around hungry?? I know that we can eat enough veggies to fill us up and all, and I do eat a lot of veggies- but sometimes I would rather just feel tummy growling than have another salad or bowl of steamed broccoli!
I'll speak for my husband and say no but my husband doesn't always recognize hunger. If he has easy access to food, he'll eat but if we are out somewhere, I carry snacks for him because I'll recognize him getting irritable and tell him to eat.
There is also head hunger and a hunger which is your body being used to eating, which neither are true hunger but we often mix them up with real hunger.
A lot of my friends are skinny and, to my recent surprise, they also have to work to stay that way. Even the ones that have never been big make it a point to do regular exercise and eat salads. So, yes. Skinny people are (sometimes) hungry but they also do the things that most of us are trying to do to lose weight.
They might be hungry due to normal hunger but if you mean in reference to maybe them starving themselves to stay thin? I don't think so.
I'm amazed at the amount of maintenance calories that some of the ladies here have to consume to hold their low weights (I say ladies just because they traditionally have low weights compared to the men). There are some ladies here who weigh 140lbs (that is a low weight to me!) who eat 2000 calories or more a day. If you are eating healthy, that's a lot of food to get in. And I don't think any of them walk around hungry, at least based on what they post here.
The thin people that I know who eat junk all day, they seem to be more hungry but I think it's the sugar and fat overload they give themselves. Some of them are blessed with better metabolisms and some of them kill themselves at the gym every night so they can eat crap food.