For a while, I thought raw fish upset my stomach, and was sad to have to give up sashimi and sushi. Then I found out soy sauce is pretty much straight gluten. Now I carry a leakproof travel-size vial of gluten free soy sauce when I have the foresight of knowing I'm going out for sushi. I found these brands on the internet and amazon, but in stores it's harder to find. Usually markets serving higher-end clientele will have it, and then it's only the more expensive organic version.