Japanese cuisine is often praised for its fresh fish, vegetables like cucumber and avocado, and unseasoned rice, making it seem inherently healthy. However, a closer look reveals it's not always the case, thanks to a staple ingredient we all love: soy sauce. While it's notoriously salty, new research shows it's even saltier than most realize.
A study by the Australian World Action on Salt and Health (WASH) analyzed 150 Asian sauces, including soy, fish, and oyster varieties. The findings? One tablespoon of soy sauce delivers 61% of the recommended daily salt intake—nearly double the 38% found in a Big Mac. Even a typical single-serve packet (often shaped like a small fish) contains about 10% of your daily limit.
Not all soy sauces are equal; salt content can vary by up to double between brands, notes Sian Armstrong, dietitian at the Heart Foundation of Australia. "Raw ingredients are popular for being quick, fresh, and healthy, but many overlook the hidden salt in side sauces," she explains. "Too much salt can cause high blood pressure, raising risks of stroke, heart disease, and kidney problems."
Don't swear off sushi or maki—just use soy sauce sparingly. Wasabi, however, is fair game.
