Not So Healthy
Sushi is very high in sugar. Rice is mixed with sugar and rice vinegar. You get a tablespoon of sugar in every cup of rice. The rice itself is spikes blood sugar levels, so you get a double whammy of sugar. Add in the sugar in the sauces and you are not eating a particularly healthy meal.
Wasabi gives sushi a kick. But it is not real. Most restaurants serve colored horseradish. One dye, food coloring yellow #5 is a known carcinogen.