At first you are like "WHAT?! Only this much?" But you'll soon learn the that your EYES were WAY bigger than the stomach. Soon you will become more in tune with what your body really needs.
A healthy human stomach should only be able to hold one litter (about 20 oz)... although some people have stretched theirs out to twice that!!! (Ew.)
Note: Only 2 bites of food are the best, the first & the last!