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

Miso soup is a famous Japanese soup and comfort food that is easy to prepare and is considered one of the healthiest soups in Japan and throughout the world, because it is packed with antioxidants, vitamins, proteins and minerals.

If you purchased miso soup from your grocery store or a restaurant for a recipe, there's a high chance that you have leftovers since most cuisines don't require lots of it and you're wondering, "How long does miso soup last?".

It is important to understand the shelf life of this soup because if it goes bad, it may cause serious health issues, like stomach aches, vomiting, diarrhoea among others.

Miso Soup Freshness and Storage

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The longevity of miso soup is dependent on whether it has been opened (if it was in a can) and the temperature.

• If stored in the refrigerator, the soup can last between 2 and 3 days provided that it is well covered to keep bacteria away.
• If stored in the pantry at room temperature, miso soup can only last for several hours, between 2 and 6 hours. It is advised to consume it immediately after preparation or properly store it away in the refrigerator. .
• Miso soup can be frozen and if done properly, it'll last for about 2 to 3 months. .
• An unopened can of miso soup may not go bad per se, but it'll continue fermenting and losing its quality with time. .

Note that the ingredients used in preparing the soup will also affect its longevity.

It is therefore difficult to give an exact amount of time that'll take before your soup goes bad since there are many variations with different condiments.

Also, the longer you store it, the more flavours it'll lose in the long run.

The timelines provided above are the safest general rules of thumb and they apply to store-bought, restaurant leftover and homemade miso soup.

If not stored properly in well-sealed cans or left out for long, miso soup will grow mould and develop a bad smell due to bacteria contamination.

Therefore, always ensure you store it in tightly sealed containers at cold temperatures, below 7 degrees Celsius.

Again, although miso soup has miso paste in it that is resistant to bacteria, it can still go bad because it contains other perishable ingredients like vegetables, tofu, potatoes, bean sprouts and mushroom.

Unopened miso continues fermenting over time; how long miso paste lasts explains expected shelf life.

How to Tell If Miso Soup is Bad?

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There are various ways to tell if your miso soup has gone bad and they include;.

• If the miso soup has a fishy, rotten smell. This is mainly caused by bacterial contamination when it has been left out for a long time and it is advised to discard it immediately. .
• If the soup has a sour and slightly bitter taste with a white film covering floating on top. This is also due to bacterial contamination and excess fermentation.
• If the colour of the broth is dark and cloudy and the soup has a lumpy or grainy texture. This is caused by letting it sit out and be exposed to air for too long.
• If the soup appears crystallized around the edges, discard it immediately because it has spoiled. This mainly occurs when it has been left out at room temperature for an extended period.
• If the miso soup becomes too thick, do not consume it as it has gone bad. Leaving it out in the open for long may promote bacterial contamination thus changing its consistency. .
• If the soup is discoloured, this is a sign of spoilage due to bacterial infestation.

Although miso soup might change its colour when stored, it shouldn't be drastic.

Also, it should never change its flavour - it might lose the initial "punch" but it should never have a different taste from what it had initially.

Once you discover your miso soup has one of the signs above, do not consume it as you'll be risking having food poisoning.

Himalayan salt block lifespan explained and sandwich shelf life guidelines offer additional food storage timelines.