Quick Reference

Meaning & Definition

Natto is Japan’s most polarizing breakfast food: sticky, stringy fermented soybeans that locals either grew up loving or still can’t stand the smell of. There’s no neutral reaction to a fresh package of natto — you’re either reaching for the chopsticks or holding your nose.

Natto refers to soybeans fermented with Bacillus subtilis bacteria, which gives them a pungent smell, an ammonia-tinged sharpness, and a texture the Japanese call neba-neba — thick, sticky strands that cling to chopsticks and stretch when pulled apart. The standard way to eat it is straight from its foam container: crack open the small packets of karashi mustard and soy-based tare sauce that come with it, stir everything together until the strands turn foamy and white, then spoon it over a bowl of hot rice. Some people mix in raw egg, chopped green onion, or grated yamaimo for extra sliminess. The flavor itself is savory and slightly nutty once you get past the smell, but that smell is exactly why natto divides opinion so sharply among both Japanese people and foreign visitors.

How to Use It

Neba-neba is the word you need to describe natto‘s texture, and Japanese speakers use it constantly when talking about the food. Stirring technique actually matters: giving the beans at least 20-30 vigorous stirs before adding the sauce packets makes the strands thicker and the flavor milder, since the process breaks down more of the sticky glutamic acid. Asking a foreign guest “Natto daijoubu?” (“Are you okay with natto?”) is a standard, almost ritual question at Japanese breakfast tables, so don’t be surprised if it comes up before anyone even opens the fridge. A common mistake learners make is treating natto as a stand-alone dish rather than a rice topping — it’s meant to be eaten mixed into rice, not by itself with a spoon.

Example Sentences

Cultural Context

Natto consumption splits Japan roughly along an East-West line. Kanto and northeastern regions, especially Ibaraki prefecture, eat it as a near-daily staple, while much of Kansai and western Japan historically avoided it, associating the smell and texture with an acquired taste they never bothered acquiring. Mito city in Ibaraki markets itself as the unofficial natto capital of Japan, with dedicated natto museums, shops selling dozens of regional varieties, and even natto-flavored souvenirs for visitors passing through.

In recent decades natto has been rebranded from a regional love-it-or-hate-it food into a mainstream health product. Japanese TV health shows regularly credit nattokinase, an enzyme produced during fermentation, with supporting circulation and heart health, while nutritionists point to its role as a probiotic that benefits gut bacteria. That health-food framing has pushed natto sales upward even among Japanese people who once avoided it, and it’s increasingly showing up in overseas supermarkets and wellness discussions as fermented foods gain global popularity.

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