What Is Natto? A Complete Guide to Japanese Fermented Soybeans

出典: 2026年7月28日 記者名: ShimaYasunobu 記事タグ: NATTO
What Is Natto? A Complete Guide to Japanese Fermented Soybeans
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What Is Natto? A Complete Guide to Japanese Fermented Soybeans

Discover natto, Japan’s traditional fermented soybean food known for its unique texture, strong aroma, and impressive nutritional profile. Learn about its history, health benefits, and how Japanese people enjoy this unique superfood.


What Is Natto?

Natto (納豆) is a traditional Japanese food made from fermented soybeans.

It is famous for its:

  • Sticky texture

  • Strong aroma

  • Rich umami flavor

  • High nutritional value

Natto is commonly eaten as a breakfast food in Japan and is often served with:

  • Steamed rice

  • Soy sauce

  • Mustard

  • Green onions


How Is Natto Made?

Natto is created through a natural fermentation process.

Step 1: Cook the Soybeans

Soybeans are soaked and steamed until they become soft.


Step 2: Add Natto Bacteria

The cooked soybeans are mixed with Bacillus subtilis natto, a beneficial bacteria used for fermentation.


Step 3: Fermentation

The soybeans are kept warm for approximately one day.

During fermentation, the beans develop:

  • Sticky strings

  • Strong aroma

  • Complex flavor


Step 4: Aging

After fermentation, natto is usually refrigerated for additional time to develop a deeper taste.


What Does Natto Taste Like?

Natto has a flavor unlike most foods.

It is:

  • Nutty

  • Savory

  • Slightly bitter

  • Rich in umami

Its texture is:

  • Sticky

  • Creamy

  • Stringy

The unique texture is one of the main reasons people either love it or need time to get used to it.


The History of Natto

Natto has been enjoyed in Japan for over 1,000 years.

There are several stories about its origin, but many believe it developed naturally through the fermentation of cooked soybeans.

Because soybeans were affordable, nutritious, and easy to preserve, natto became an important everyday food.

Today, natto remains a traditional Japanese breakfast staple.


How Is Natto Eaten in Japan?

The most common way to enjoy natto is simple.

Natto Rice

The classic preparation:

  • Natto

  • Steamed rice

  • Soy sauce

  • Mustard

  • Green onions

The ingredients are mixed together until the natto becomes very sticky.


Popular Natto Toppings

Many Japanese people customize natto with:

  • Raw egg

  • Green onions

  • Kimchi

  • Seaweed

  • Pickled vegetables

  • Wasabi


Natto in Modern Japanese Cuisine

Natto is also used creatively in:

  • Sushi rolls

  • Pasta dishes

  • Toast

  • Salads

  • Rice bowls

Modern chefs continue to create new ways to enjoy this traditional food.


Why Is Natto Considered a Superfood?

Natto is valued for its nutritional qualities.

It contains:

  • Plant-based protein

  • Dietary fiber

  • Vitamin K2

  • Fermented compounds

  • Beneficial bacteria

Because of its fermentation process, natto is often associated with digestive health.


Natto and Probiotics

Natto contains naturally occurring beneficial bacteria from fermentation.

These bacteria are part of why fermented foods are popular among people interested in gut health.

Other traditional Japanese fermented foods include:

  • Miso

  • Soy sauce

  • Pickles


Is Natto Vegan?

Yes.

Traditional natto contains only:

  • Soybeans

  • Natto bacteria

It is naturally vegan and suitable for plant-based diets.


Is Natto Gluten-Free?

Pure natto is naturally gluten-free.

However, some flavored varieties or sauces may contain gluten ingredients.

Always check the product label.


Natto vs. Regular Soybeans

Natto Soybeans
Preparation Fermented Not fermented
Texture Sticky Firm
Flavor Strong umami Mild bean flavor
Uses Breakfast, side dish Tofu, soy milk, cooking

Why Does Natto Have a Strong Smell?

During fermentation, natto develops aromatic compounds that create its distinctive smell.

The aroma is part of the traditional natto experience.

Many people who enjoy natto appreciate this unique character.


How to Eat Natto for Beginners

If you are trying natto for the first time:

  1. Mix it thoroughly until it becomes sticky.

  2. Add soy sauce and mustard.

  3. Combine with warm rice.

  4. Start with a small amount.

Adding familiar flavors can make it easier to enjoy.


Frequently Asked Questions About Natto

Is natto healthy?

Natto is considered a nutritious fermented food containing protein, fiber, and vitamins.


Why is natto sticky?

The sticky texture comes from fermentation.


Is natto eaten cold?

Yes. Natto is usually served chilled or at room temperature.


Does natto taste like tofu?

No. Natto has a much stronger flavor and unique texture compared with tofu.


Where can I buy natto?

Natto can be found at:

  • Japanese grocery stores

  • Asian supermarkets

  • Online Japanese food stores


Why Is Natto Important in Japanese Culture?

Natto represents the Japanese tradition of transforming simple ingredients through fermentation.

It reflects values such as:

  • Natural preservation

  • Seasonal eating

  • Healthy living

  • Respect for traditional foods

For many Japanese families, natto is not just a food—it is part of everyday life.


Conclusion: Discover Japanese Natto

Natto is one of Japan’s most unique and traditional foods.

Its strong aroma, sticky texture, and powerful nutritional profile make it a fascinating example of Japanese fermentation culture.

Although it may take time to appreciate, many people discover that natto offers a delicious and healthy connection to Japanese cuisine.

Discover authentic Japanese natto and experience one of Japan’s most famous fermented foods.

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