The food-portions in US are big. Huge in comparison to what I get back home. And people here seem to accept it as a normal part of life. Waiters happily bring you boxes for you to pack whatever you can't finish. The first time my friend and I ordered a pizza, we had the leftover for 3 days after. Which makes me wonder, whether it is an issue of supply or demand.
But what is incredible is how adaptable one's stomach can be. My first burger here, I could only finish about 2/3 of it. My second burger here, I finished about 3/4 of it. But my third burger here, I finished all of it! No doggy-bagging!!
My jaws are aching from eating the 5-inch thick sandwich this morning.