What if some of the most nutritious foods you could eat every day were not expensive superfoods, exotic supplements, or products advertised as the latest health breakthrough?
In Japan, everyday meals often emphasize variety, seasonal ingredients, fish, soy products, vegetables, fermented foods, and carefully balanced portions. This approach to eating has attracted worldwide attention because it demonstrates how ordinary ingredients can contribute to a nutritious and satisfying diet.
Eggs are frequently praised as one of nature's most nutrient-dense foods. They provide high-quality protein, vitamin B12, selenium, and choline, a nutrient involved in normal brain function and other essential processes. Yet eggs are only one part of a much larger nutritional picture.
Other familiar foods can offer equally important benefits, including nutrients that eggs provide in smaller amounts or do not contain at all.
Imagine building your daily meals around five versatile foods: soybeans, oily fish, leafy green vegetables, fermented soybeans, and eggs. Each offers a different nutritional advantage, and together they can help create a balanced diet that supports overall health.
There is no universally accepted scientific ranking that establishes these five foods as Japan's official top five daily foods. Nor is there one ingredient that deserves the title of the ultimate nutritional king for everyone. The best choices depend on your nutritional needs, health conditions, preferences, and the rest of your diet.
Nevertheless, exploring these five foods reveals an important lesson: good nutrition is not about finding one magical ingredient. It is about consistently choosing foods that supply complementary nutrients.
1. Natto: Japan's Traditional Fermented Soybean Food
Why it deserves attention: Natto combines plant-based protein, fiber, vitamin K2, and naturally occurring compounds produced during fermentation.
Natto is a traditional Japanese food made by fermenting soybeans with beneficial bacteria. It has a distinctive smell, a sticky texture, and a flavor that can take some getting used to. For people who enjoy it, however, natto offers a combination of nutrients that makes it an interesting addition to a balanced diet.
Unlike many heavily processed convenience foods, natto is relatively simple in composition. Its nutritional value comes primarily from soybeans and the fermentation process.
Rich in plant-based protein
Protein is essential for building and maintaining muscle, repairing tissues, producing enzymes, and supporting many other bodily functions.
Natto provides plant-based protein containing all nine essential amino acids. Soy protein is considered a high-quality plant protein because it supplies these essential amino acids in useful proportions.
This makes natto particularly helpful for people who want to increase their intake of plant foods without relying entirely on animal products.
Protein also contributes to satiety, helping meals feel more satisfying. When combined with vegetables and other fiber-rich foods, natto can form part of a balanced meal that supports steady eating habits.
A source of vitamin K2
One of natto's most distinctive nutritional features is its high vitamin K2 content.
Vitamin K plays an important role in normal blood clotting and is involved in proteins associated with bone metabolism. Natto can contain substantial amounts of menaquinone-7, commonly known as MK-7, a form of vitamin K2 produced during fermentation.
However, the amount of vitamin K can vary depending on the product and preparation.
People taking warfarin or another vitamin K-sensitive anticoagulation regimen should be especially careful. Suddenly increasing natto consumption can interfere with the consistency of vitamin K intake required for safe medication management. Anyone taking these medications should discuss dietary changes with their healthcare professional rather than making major changes independently.
Fermentation and gut health
Fermentation changes the composition of soybeans and produces compounds that influence flavor, texture, and digestibility.
Natto also contains naturally occurring bacteria associated with its fermentation. Nevertheless, the presence of microorganisms in a fermented food does not mean every product delivers the same probiotic effects or that eating natto will cure digestive problems.
A healthy digestive system depends on many factors, including dietary fiber, overall food variety, physical activity, medications, and individual health conditions.
Natto can contribute to a varied diet, but it should not be treated as a replacement for medical care or a guaranteed solution for gut-related symptoms.
How to eat natto
In Japan, natto is often served with rice, mustard, and a small amount of seasoning. You can also try it with:
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Brown rice and steamed vegetables.
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A bowl of miso soup and a simple vegetable side dish.
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Whole-grain toast or a savory rice bowl.
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Chopped scallions, cucumber, or other fresh vegetables.
If you are new to natto, start with a small serving and see whether you enjoy its texture and flavor.
Pay attention to the seasoning packet, which may contain substantial sodium. Choosing less seasoning or adding fresh ingredients can help keep the meal balanced.
Natto is not necessarily the best choice for everyone, but it is an excellent example of how a traditional food can provide a combination of nutrients that is difficult to obtain from a single ingredient.
2. Fish: A Valuable Source of Protein and Omega-3 Fatty Acids
Why it deserves attention: Oily fish provides high-quality protein and long-chain omega-3 fatty acids that support normal cardiovascular and brain function.
Fish is an important part of many Japanese eating patterns. Common choices include salmon, sardines, mackerel, and other varieties that can be grilled, steamed, simmered, or served in smaller portions alongside vegetables and rice.
Fish is not nutritionally identical across species. White fish may provide lean protein with relatively little fat, while oily fish generally supplies more omega-3 fatty acids.
Omega-3 fatty acids and cardiovascular health
Certain oily fish contain two long-chain omega-3 fatty acids known as EPA and DHA.