Are you actually craving the food from hunger? Do you ever feel full?
Are your toilet habits normal?
I used to feel empty and crave all sorts of things all the time. Got some much flack about my weight then finally got diagnosed with malabsorbtion earlier this year.
It's more common to drop weight with it but it can go the other way, would have to be me lol, and you end up craving food as you are never properly satisfied and such as your body can't process things properly and ends up with all kinds of deficiencies etc...
Since I had my initial course of treatment it's made a huge difference and my weight has been dropping off.
So, might be worth getting things checked out if there are any other symptoms.