How Long Does Miso Soup Last? Does Miso Soup Go Bad?

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Does Miso Soup Go Bad

Miso soup is a well-known Japanese soup that is also considered a comfort meal. It takes very little time to make and is regarded as one of the healthiest soups in Japan as well as the rest of the globe due to the abundance of antioxidants, vitamins, proteins, and minerals that it contains.

If you bought miso soup from the supermarket or a restaurant for a dish, there’s a good possibility that you have some leftovers since most recipes don’t call for a lot of it. Because of this, you may be asking, “How long does miso soup last?”

It is essential to have a good understanding of how long this soup may remain fresh for consumption since, if it spoils, it might result in a number of major health problems, including stomach pains, vomiting, and diarrhea, amongst others.

Keep reading to learn how long miso soup can be stored before it goes bad and what you can do to prevent this from happening.

What’s Miso Soup?

Dashi, a fish broth, a variety of vegetables, and miso paste are the components that go into making miso soup (fermented soybeans, rice malt or barley).

Its adaptability and the fact that there are so many different ways to prepare it have contributed significantly to its widespread appeal around the globe.

In terms of flavor, the fermented miso paste is responsible for bestowing the soup with its robust, well-developed flavor as well as its salty taste.

People have a tendency to believe that since the soup contains miso paste, which is very salty and has qualities that inhibit the growth of microorganisms, it is more resistant to going bad.

Even if the paste is resistant to bacterial development, the other components of the miso soup may quickly get spoiled, which would render the whole batch useless.

Consuming miso soup on a regular basis has a number of health advantages, one of which is that it gives the body essential vitamins and minerals, including zinc, manganese, vitamin K, calcium, and protein.

Minerals like these help sustain systems in the body, including things like bones and the neurological system.

In addition, the high amounts of probiotics help improve digestion, it helps build the immune system, it reduces cholesterol, and it helps boost mental health.

How Long Does Miso Soup Last? Does Miso Soup Go Bad?

The shelf life of miso soup varies depending on the temperature as well as whether or not the soup has been opened (if it was stored in a can).

  • If it is carefully covered and placed in the refrigerator, the soup may stay fresh for up to three days; however, this requires that it be refrigerated for at least two of those days.

  • Miso soup can only be kept fresh for a few hours if it is kept at room temperature in the pantry. Its shelf life is anywhere between two and six hours. Either use it right away once it has been prepared, or put it in the refrigerator to preserve it safely until you are ready to use it.

  • You can freeze miso soup, and if you prepare it correctly, it will keep for approximately two to three months in the freezer.

  • It’s possible that a can of miso soup that has not been opened will not spoil, but the soup will continue to ferment and become less tasty over time.

It is essential to keep in mind that the duration of the soup will be directly impacted by the components that are utilized in its preparation.

Due to the fact that there are many different condiments, it is consequently impossible to specify an exact period of time that will pass before your soup becomes spoiled.

Additionally, the longer it is stored, the more of its original flavors will be lost in the long term.

The times listed above are the safest general rules of thumb, and they are applicable to both store-bought miso soup as well as leftover miso soup from restaurants as well as homemade miso soup.

If miso soup is not kept correctly in cans that are well-sealed or if it is left out for an extended period of time, it will get contaminated with bacteria, leading to the growth of mold.

Because of this, you should always make sure to keep it in containers that have tight seals at temperatures that are below 7 degrees Celsius.

Even while miso paste is resistant to germs, the other components in miso soup, such as vegetables, tofu, potatoes, bean sprouts, and mushrooms, may still cause the soup to spoil. This is due to the fact that the soup includes other perishable items.

How to Tell If Miso Soup is Bad?

There are a number of indicators that your miso soup has gone bad, some of them include the following:

  • In the event that the miso soup has a stale, fishy odor. Because bacterial contamination is the primary cause of this condition, it is strongly recommended that the item be thrown away as soon as possible after it has been left out for an extended period of time.

  • If the soup has a somewhat sour and bitter flavor, and there is a thin layer of white film floating on the surface of the soup. In addition, this is because there was an excessive amount of fermentation and bacterial contamination.

  • In the event that the soup has a gritty or lumpy consistency and the broth has a dark color with a hazy appearance. This is brought on by leaving it exposed to the elements for an extended period of time, namely the air.

  • Throw away the soup as soon as you see that it has crystallized around the edges, since this indicates that it has gone bad. This happens most often when the item in question has been stored at room temperature for a long length of time.

  • Do not continue to drink the miso soup after it has reached the desired consistency since it has gone bad. If you leave it out in the open for an extended period of time, it might get contaminated with germs, which would result in a change in its consistency.

  • If the soup has changed color, this is an indication that it has gone bad owing to the presence of germs.

Even if storing miso soup might cause the color to shift somewhat, the shift shouldn’t be too dramatic.

Also, the flavor shouldn’t ever change — it’s okay if it loses some of the “punch” it had at first, but it shouldn’t ever have a taste that’s different from what it had in the beginning.

If you find that your miso soup contains one of the indicators described above, you should not eat it since doing so puts you at risk of becoming sick from food poisoning.


Is it OK to reheat miso soup?

Even while miso soup may be stored for a long time and heated up without losing its quality, the healthful enzymes contained in the miso will be lost if the soup is cooked. If you want to reheat it, do it in a low-key manner.

Does miso soup expire?

The shelf life of miso, which is a sort of preservative, is rather lengthy. However, depending on the circumstances in which it is stored and the location in which it is kept, there is a possibility that it may go bad, and this is something that should worry you.

Is miso soup good after a week?

No matter how you choose to preserve them, the solids in the miso soup will go bad in a short amount of time. If you store your leftover miso soup in an airtight container, you can assure that it will remain edible for an additional two to three days after you have finished eating it.

Can you keep leftover miso soup?

When stored in the refrigerator, miso soup has a shelf life of up to two to three days. When stored in the freezer, miso soup has a shelf life of up to two months. Miso soup has a shelf life of up to two hours when left at room temperature.

Is it OK to drink miso soup everyday?

Researchers have discovered that lowering the risk of breast cancer by eating one bowl of miso soup every day, as is common practice in Japan, may have a significant impact on the risk. The use of miso has a highly alkalizing impact on the body and bolsters the immune system, making it more effective in fighting illness.

Is it rude to put rice in miso soup?

This is not acceptable behavior. Except when eating a rice bowl meal that also includes a topping, rice should not be blended with other foods or sauces, including soup.

Is miso soup carcinogenic?

However, the researchers discovered that there was no significant relationship between consuming miso soup and the disease. It’s possible that this is due to the fact that the anti-carcinogenic properties of the soy in miso soup effectively balance out the danger that’s posed by the carcinogenic effects of the salt in the soup.

Can I eat expired miso soup?

No, we do not recommend that you consume miso soup that has beyond its expiration date. It will have a terrible flavor, and it may make you unwell.

Can you keep miso soup in the fridge?

It depends. If it’s miso soup made with Japanese dashi (with katsuobushi), and the dashi is freshly made, then the soup will last in the refrigerator as long as the dashi itself, which is at least three days (some people keep bottled dashi for up to a week, but I don’t recall ever keeping any for more than three days.). If it’s miso soup made with Japanese dashi (without katsuobushi), then it will last in

How long does miso last past expiration?

Because of the high salt content, miso is considered to be a “preservative food,” meaning that it has the ability to be stored for an extended amount of time. If stored in your refrigerator, miso itself does not go bad. Up to a year after it has been made, the flavor of miso should be able to maintain a level of consistency that is quite similar to when it was first made.

How long does miso stay good once opened?

In a nutshell, the longer you keep it, the more noticeable the shifts in flavor will become. Therefore, there is no one appropriate response to the question of how long miso paste may be stored after it has been opened. I’ll only offer you a general range—from three to even twelve months—for when the flavor should be rather stable.


Miso soup is a Japanese broth that is usually composed of tofu, miso paste, spring onions, wakame, and dashi. It takes very little time to make and may be stored in the refrigerator for up to three days or in the freezer for up to two months.

If it is left out, it will only be usable for a few of hours at most.

Because microbes are the primary cause of spoilage in this soup, appropriate storage in airtight containers is essential if you want to keep it fresh for a longer period of time.

If you want to have tasty miso soup, make sure you don’t let it sit out at room temperature with the lid off.

You may also keep it fresh for a longer period of time by freezing it.