Sushi is very healthy, and a favorite food of mine. The nutritional value or health benefit varies by what type of sushi you're eating. If you're eating elaborate American-style sushi rolls loaded with all kinds of stuff in them--sauces, deep-fried foods, eel (the sauce used negates any benefits associated with eel), etc, they're not very healthy at all (though still delicious). But if you're having sushi which is mostly just fish, it contains a lot of nutritional value with with few negative health points.
Benefits include:
-Fish is a source of high-quality protein and minerals and is low in calories.
-A lot of sushi is high in omega-3 fatty acids (particularly fatty fishes such as salmon, tuna, and mackerel), which are good for your brain and heart. Avocado is as well, and is used in a lot of sushi rolls.
-Seaweed is high in essential vitamins and minerals.
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"A flower falls, even though we love it; and a weed grows, even though we do not love it."