Great! So I should eat it every day, right?
Slow down there, turbo. While sushi undoubtedly packs a nutritional punch, you should be wary of overdoing it: Ansel suggests sticking to one or two servings per week, tops. "Sushi can harbor bacteria that can cause food borne illness, especially for children, pregnant women or people with weakened immune systems." Even worse, consuming too much sushi can potentially lead to mercury poisoning, "especially if your sushi contains high-mercury fish such as ahi or big eye tuna, swordfish, shark, or tilefish."
That said, if you avoid these higher-risk fish and restrain yourself from eating sushi every day, week after week, you should be safe from turning into the Mad Hatter.