An average 6-piece inside-out 'uramaki' sushi roll (rice on the outside, nori on the inside, as pictured at right) at a Japanese restaurant in the United States contains 1 cup of rice.
(Note: 1 serving of rice = 1/2 cup)
This is a perfect example of a relatively healthy, low-calorie Asian meal undergoing a monstrous caloric metamorphosis upon arriving to the United States.
In Japan, the vast majority of sushi is eaten nigiri style (this is where rice is compacted into a small rectangle underneath each piece of fish) or maki style (nori/seaweed on the outside of each piece.)
It's also significant that maki rolls are approximately a half or a third of the size of inside out varieties common on this side of the Pacific Ocean.
This figure means that 6 pieces of an inside-out roll pack in slightly less than 200 calories from the rice alone.
Order two of those puppies and you are up to 4 servings of grains, per USDA pyramid standards.
Another calorie shocker? Spicy rolls contain anywhere from 100 to 150 moe calories than their traditional counterparts -- the special sauce is basically mayonnaise with a kick.