“Go Big or Go Home”
Americans are also big on size. Cars are large, people are large (albeit not all of us), houses are large, shops are enormous, and America is enormous! It ain't American unless it's large. As soon as you order meals in a restaurant, you'll understand America's obesity epidemic.
Because the food quantities are often enormous, any leftovers either go to waste or are consumed by someone who is already full and is compelled to finish. Smaller quantities are served at many high-end restaurants, albeit at a larger cost.
One advantage of large servings is that you can always take the leftovers home in a box and enjoy them the next day. And, being the world's fast food capital, you can anticipate food to be served in huge, larger, and supersized portions! Prepare to gain a few pounds!