Human adaptation

My body has seemed to have adapted to an increased consumption of food. In the first week, I was like in a food coma all day and while the second week was better, I still wasn't hungry at either lunch or dinner. Come the third week, I'm actually hungry for lunch and dinner! And I don't think it's because I've reduced my portions.

I can think of two explainations. Either my body has just become faster at digesting food (knowing that more is coming soon) or my stomach has just expanded. It's probably a combo of the two. I am finding that on the weekend, I am seriously craving food without the regular massive 3 meals a day. I dread the day when I have to go back to school...