How could you possibly still be hungry!?!?

[The children in our family must be going through a growth spurt. They've been eating like ravenous wolves at each meal over the last few days -- often consuming more food than Mom and Dad. So after a particularly large supper, it was shocking when Elliot asked for a snack less than an hour afterwards. The above question, prompted by this snack request, was answered with classic child-like simplicity]:

Just because, I guess.