The Sushi FAQ - sushi, sashimi and related Japanese cuisine.
 

Sushi Questions Answered
Wasabi and Sodium

Q: Is Wasabi high in sodium? Trying to cut down on the salt. I know Miso is very high and so is Soy Sauce. - Preston.

Real wasabi has less than 1 milligram of sodium per 4oz serving, which is effectively zero. The 'fake' wasabi that is served usually instead of the real item however has around 100mg of sodium per serving, significantly more than the real deal. If your sushi place has the real item, I would ask for that if you are really reducing sodium, although 100mg is still not a huge amount, it may still be more than you are looking for. You are correct about soy sauce and miso having high sodium contents.
 

                                                                          


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