Sushi is a combination of many ingredients, so the nutrition profile is diverse. Sushi rice is a great source of carbohydrates and has negligible fat. The seaweed wrapper nori is rich in iodine. Seafood is the main ingredient of the dish that contains omega-3 fatty acids and selenium in large quantities. Different types of fish added in the sushi contain different minerals and vitamins. The fruits and vegetables (avocado, cucumber, etc.) used in sushi also add to its benefits.
The accompaniments, ginger and wasabi, contain antioxidant compounds, as well as vitamins and minerals. Soy sauce, which is a delicious dip for the sushi roll, contains very high levels of sodium, so use it sparingly. Additional cream and sauces like mayonnaise will add to the calories. So, control your cravings while enjoying the sushi.
Source : January 12th, 2018 Organic Facts page (https://www.organicfacts.net/health-benefits/other/sushi.html)