20 year old male all of sudden extremely hungry?

I am a 20 year old male, yesterday I just ate and ate and ate, and I never got full and it was not just snack food it was real food: hot dogs, pizza, chips, and some more hot dogs. Anyone have any ideas on why I could be like this and never feel full this is the first time I have done this. Oh and I never eat sweet things for breakfast and I at doughnuts which is extremely unusual for me