About Sushi

What is Sushi
In Japanese cuisine, sushi is vinegared rice, usually topped with other ingredients, including fish, various meats, and vegetables. Outside of Japan, sushi is sometimes misunderstood to mean the raw fish itself, or even any fresh raw-seafood dishes. In Japan, sliced raw fish alone is called sashimi and is distinct from sushi, as sashimi is the raw fish component, not the rice component. The word sushi itself comes from an archaic grammatical form of a word that is no longer used in other contexts; literally, "sushi" means "it's sour".

Type
There are various types of sushi: sushi served rolled inside nori (dried and pressed layer sheets of seaweed or algae) called makizushi or rolls; sushi made with toppings laid with hand-formed clumps of rice called nigirizushi; toppings stuffed into a small pouch of fried tofu called inarizushi; and toppings served scattered over a bowl of sushi rice called chirashi-zushi.
The main ingredients of sushi, raw fish and rice, are naturally low in fat (with the exception of some rolls, especially Western style rolls), high in protein, carbohydrates, vitamins, and minerals. Specifically:

Nutritional information
Fats: Most seafood are naturally low in fat; and what fat is found in them is generally rich in unsaturated fat Omega-3. Since sushi is often served raw, no fat is introduced in its preparation.
Proteins: Fish, tofu, seafood, egg, and many other sushi fillings contain high levels of protein.
Vitamins and Minerals: These are found in many of the vegetables used for sushi. For example, the gari and nori used to make sushi are both rich in nutrients. Other vegetables wrapped within the sushi also offer various degrees of nutritional value.
Carbohydrates: These are found in the rice and the vegetables.