If you have a hankering for Japanese fare and are watching your weight, vegetable sushi is a healthy choice because most vegetables are extremely low in calories. If you include avocado in your sushi, however, stick to thin slices. Avocados are much higher in fat and calories than most other fruits and vegetables.
Vegetable sushi may contain a broad range of ingredients, and the varying sizes also make it difficult to give this food a specific calorie total. However, a typical roll may contain about 30 calories per piece, or about 350 calories per roll of 12 pieces. If you eat your sushi with pickled ginger, you'll add about 25 calories per 2 tablespoons of the condiment; soy sauce adds 11 calories per tablespoon, while prepared wasabi has about 15 calories per teaspoon.