Who else always gets hungry after the actual meal at a restaurant?

So, I just moved to The Hague, Netherlands, and have already met some people here, and we went out to have dinner at a fish restaurant.

After I'd eaten my fish and chips, it was a pretty large meal, I got even hungrier than I was before, and wanted to order another fish and chips meal, but my friends were like : Dude, we'll conduct a scientific experiment with you about your eating habits ! You'd eat the entire restaurant's food if you didn't take so damn long and talked less ! "

My roommate is Chinese and eats like a little bird... the food he cooks is good, but just not enough -.-

Or I've already eaten a 40 cm diameter New York Pizza here and a few hours later I was houngry again -.- Everyone's like : Dude, we don't need TV, we can watch you eat all day long !

I wonder why others eat so little :/
Who else always gets hungry after the actual meal at a restaurant?
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