Japan's slimy soybeans are super good for you

  • Food News
  • Tuesday, 31 May 2016

Natto, or fermented soybeans, are everywhere in Japan. There are natto burgers, natto bruschetta made with heaps of natto mixed with melted cheese or tomatoes on toasted bread, and even natto curries and sushi. But the most common way Japanese people eat natto is for breakfast over steamed rice with condiments, such as pickled fruits and vegetables.

Sink your chopsticks into a heaping bowl of natto, lift and its renowned sticky strings appear. To many, this stickiness is an instant textural turnoff. To natto lovers like myself, the slime only serves to tantalize the palate with the rich, savoury flavour to come. Some people think the flavour is reminiscent of a strong cheese, but for natto fans it is mouth-watering umami heaven.

Supercharged superfood

Famous for its stickiness and strong flavour, natto is also highly nutritious. A one-cup serving has more than 80% of the US recommended dietary allowance (RDA) of iron, and almost 40% of the RDA of calcium, vitamin C and dietary fibre. Natto is also packed with the enzyme nattokinase, which in scientific studies is a proven clot-buster and blood thinner and therefore contributes to heart heath. Laboratory analyses also suggest that nattokinase might also help protect against dementia and Alzheimer's disease, and have shown that it is a potentially powerful anti-cancer compound as well.


Japan and beyond

To me, one of the most interesting things about Japan's beloved, traditional natto is that there is nothing uniquely Japanese about it. Versions of soybeans fermented with the bacteria Bacillus subtilis can be found all over eastern Asia and into the Himalayas and southern Asia. Not only is natto closely related to Chinese shuidouchi and Korean cheonggukjang, but it is also related to Thai thua nao khaep, Indian piak, the pe-poke of Myanmar, and Nepalese and Himalayan kinema as well.

The likelihood that most of these other preparations are related to Japanese is very high, because the preparation methods between the various forms are virtually identical. In Japan, the traditional fermentation process is achieved by wrapping the cooked beans in straw that naturally carries Bacillus subtilis bacteria used to ferment the beans. From the mountainous regions of the Himalayas to northern Myanmar and Thailand, the beans are packed in ferns or other leaves that are available in the environment that also introduce the same bacteria into the dish.

Thai Natto - Thua nao Khaep – fermented in a banana leaf. Photo: Noneam/Dreamstime
Thai Natto - Thua nao Khaep – fermented in a banana leaf. Photo: Noneam/Dreamstime

Cultural variety

Production of the fermented soybeans varies a bit between the cultures. In modern Japan, most production has been industrialized and people purchase natto at supermarkets or stores, whereas in most other areas around Asia, production of natto-like fermented soybeans remains at the household or village level.

Natto has the same high-powered nutrition of other superfoods. Photo: Marilyna/iStockn
Natto has the same high-powered nutrition of other superfoods. Photo: Marilyna/iStockn

Use of natto-like products also varies between the cultures and is roughly correlated with the level of technological achievement. In Japan, people enjoy more fresh or "raw" natto preparations that are warmed and eaten over rice, because the industrial supply chains of the fermented beans, and widespread refrigeration, allows this. In Nepal and other areas without electricity and refrigeration, natto-like preparations are more often cooked into curries, soups or other dishes. Portions that cannot be eaten within a few days after fermenting are flattened into pancakes or balls and thoroughly dried before being added to other dishes as a flavouring.

Out of Africa

Across western Africa, there are also similar preparations made with African locust seeds and bacillus species called sumbala or iru, or ogiri, which is made from fermented oil seeds such as sesame, or seeds from melons and gourds. It is unclear whether these fermented African seed preparations are related to the natto-like preparations of Asia (or whether they may be precursors of them), but in recent years, shortages of some seeds are forcing many Africans to use fermented soybeans to get that special mix of sour and savoury that the fermented seed preparations traditionally have offered. Either way, that savoury but sour flavour is sought after by many cuisines on at least two continents. – Reuters/Zester Daily/Laura Kelley

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