The calorie intake is meant to be a guide only, so it is possible to fall outside of it and still be perfectly healthy/on track.
As others have mentioned you'll want to make sure that you're consuming all the nutrients you need in the food you're eating. At this point it could be that you're eating really hardy and filling foods (which is good), but that you don't have enough variety in your diet. This is a problem because you'll be missing out on vital nutrients, but also because you can very easily become bored by what you're eating and so while you'll lose weight in the short term, you won't have the stamina to keep up with it and are not learning to craft balanced and healthy meals that you can use for life rather than just for when you want to shed pounds.
One thing you could be missing out on is fresh fruit and vegetables. In my experience, I've found that I'll sometimes go over or be higher in my calorie range when tracking than I thought I would be due to fruits and veggies. Things like sweet potatoes, bananas, oranges, or avocadoes can be a lot higher in calories than one might think, but they're also super rich in great nutrients.
Another possibility I can think of is activity level. Some days when I'm just at home and I don't have much to do that day I hardly eat a lot at all (and usually have to remind myself oh yeah it's 2pm I should probably eat lunch at some point!), but on days when I'm super physically active or busy doing schoolwork, office work, etc I can eat like a horse and still be hungry. So, it could be possible that your activity level is low enough that you don't need to eat more and you could try to amp it up a little or just eat less to follow the activity level.
The last thing I can think of is snacks. A lot of the time I prefer to snack throughout the day. And often I'll eat 4 or even 5 smaller "meals" consisting of about 250 calories or less depending on my mood. I tend to have times when I don't want to eat anything for hours even though I know I'm hungry, but the thought of eating a full meal makes me nauseous, so small meal/snacks can work better for me and tends to boost your appetite.
At the end of the day though, if there's nothing else going on, that could just be the way your metabolism works. If you're not hungry, you're not hungry and you shouldn't force yourself to eat.
Edited by: NEARLYNINA at: 11/15/2013 (01:52)
The hardest thing for the soul to do is to stand up to its own weakness - Habib Ali Al Jifri
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