It’s a superfood but natto as we know it. Japan’s slimy fermented beans are coming your way

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Comprised of smelly soya beans held together by strands of mucus, the ancient dish is appearing in health food shops across the world
It is smelly, slimy and contains bacteria – and a sizeable number of Japanese wouldn’t touch it with a pair of barge pole-length chopsticks. But after centuries as a breakfast food for Japanese diners with nerves of steel, natto is emerging as a global superfood to rival kimchi, kombucha and kefir.
Its exact origins are unknown. Some believe it was introduced to Japan from China by Buddhist monks during the Yayoi period (300BC-AD300), before becoming a staple among rural communities during the Edo period (1603-1868).
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About this article
- Length
- 112 words · 1 min read
- Published
- September 14, 2026
- Byline
- Justin McCurry in Tokyo
- Source
- The Guardian