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Eat right to feel right.

The Mysteries of Miso

2/23/2021

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Alt text: Miso nutrition Toronto Soup Co.Picture
What is miso?

MIso - you get miso soup with your sushi platter, but do you know what it is?

Miso is a fermented bean paste.

Miso's origin

Depending on the source of information, miso either originated in ancient China and then introduced to Japan over 1,000 years ago by Buddhist priests or it originated in Japan in the Yayoi period, 300 BCE to 300 CE. Grain and fish misos had been manufactured in Japan since the Jōmon period, 14,000–300 BC.

It’s possible that citizens of both countries figured out that you can ferment grains or legumes with salt to preserve them. Curing food with salt to preserve it crosses cultures. 
To make miso, soybeans are fermented for anywhere between three months to three years with a mould called koji. Koji can grow on cooked soybeans or grains. Steamed white rice is the most common way to grow koji. Koji breaks down the structure of the soybeans into amino acids, simple sugars, and fatty acids.

At its most basic, the miso soup you get with your lunch combo is miso paste mixed with hot water. Sometimes the soup comes with tofu and green onions.

The flavour of miso depends on the ingredients used, fermentation time, and koji ratio to soybeans. Miso adds a salty, umami flavour to dishes. 

If you ever stood in front of jars of miso at the grocery store and wondered about the colour difference, here’s the answer:

Generally, the darker the miso, the more intense and salty the miso will taste. 

Darker miso has been fermented longer and has a more intense flavour. Lighter miso has a short fermentation and is sweeter.
 types of miso

Nutritional profile of miso

On average, one tablespoon of miso has 
  • 2 grams of protein
  • 4 grams of carbohydrates
  • 1 gram of fat
  • 1 gram of fibre

Miso is also a source of manganese, copper, vitamin K, zinc, iron, phosphorus, choline, omega-3 fats, magnesium, calcium, potassium, selenium, riboflavin (vitamin B2), niacin (vitamin B3), pyridoxine (vitamin B6) and folate (vitamin B9).

Fermented foods and healthIn general, fermented foods are beneficial for the gut. A healthy gut contributes to a healthy brain, a healthy immune system and good health overall.

Fermented foods naturally contain probiotic bacteria- unless the probiotics are removed (e.g. beer or wine) or made inactive. The role of probiotics is to balance the good and bad bacteria in the gut. Too much of either can be unhealthy. 

Mental health

People refer to the gut microbiome as the “second brain”.

The gut houses every class of neurotransmitters found in the brain. Microorganisms and nerve cells in the gut produce more than forty neurotransmitters, including 95% of the body’s serotonin and about 50% dopamine.

A healthy gut microbiome helps balance these neurotransmitters for a healthy brain. A healthy brain is a large component of mental health.
​

When you’ve got a better balance of good bacteria vs. bad, your brain works better, and your body’s processes are more efficient. Several human and animal studies show reduced signs of depression and anxiety with probiotic supplementation. 
 Miso and brain health

Why nutrients in miso are essential for the mind and body

Omega-3s - The brain is mostly made up of fat and needs fat to function efficiently. Omega-3s boost the body’s synthesis of dopamine. Supplementing with omega-3 eases hyperactivity. Omega-3 can improve working memory and learning.

Magnesium - Magnesium helps with focus and sleep. It can help fight depression (when magnesium deficiency is contributing to depression symptoms). 

Additionally, research indicates that magnesium helps fight inflammation, which is at the root of many diseases and is an immune response. Magnesium helps create and repair DNA and RNA. It can help improve PMS symptoms and prevent migraines.

Zinc - Zinc is the second-most-abundant trace mineral in your body, second to iron. Zinc helps create neurotransmitters, benefits the immune system - it is critical for the development and function of immune cells - and is necessary for wound healing. Zinc is another anti-inflammatory.

Choline - Choline is used by the body to produce acetylcholine, an important neurotransmitter essential for the brain and nervous system. More choline available to your brain means less brain inflammation and better brain function. Choline plays a vital role in regulating mood, anxiety, learning and memory.

Vitamin B6 - Vitamin B6 is critical to producing and efficiently using essential brain chemicals such as serotonin, dopamine, and norepinephrine. Vitamin B6 helps form dopamine and supports serotonin production. For women, vitamin B6 can relieve anxiety, depression and irritability caused by PMS.

That’s only a third of the nutrients in miso.
​

Immune system
Most of your immune system resides in your gut. A robust immune system is always essential, but we should especially be feeding our immune systems well with COVID-19 running amok.

And, as previously mentioned, zinc is beneficial to the immune system.
So, balancing good and bad bacteria in your gut is vital to physical, mental, and emotional health. 

Other conditions that probiotics such as those in miso can help with
  • Inflammatory bowel disease (IBD)
  • Irritable bowel syndrome (IBS)
  • diarrhea
  • Urinary tract infections.
  • Yeast infections
  • Eczema 
A note on salt in misoMiso is high in sodium, with about 630 milligrams per tablespoon. Most miso falls between five and twelve percent salt by weight. So if you are prone to high blood pressure, you might want to use it sparingly or not at all. At Toronto Soup Co., we recognize that many people are sensitive to salt, so we keep added salt to a minimum. 
That all said, salt plays an essential part in a healthy body, and miso is a natural, nutritious way to get it.

Sodium is an electrolyte. Electrolytes are minerals that carry an electric charge. Electrolytes like sodium, calcium, magnesium and potassium are essential for keeping your nervous system and muscles functioning. 

Electrolyte function
  • They regulate the fluid levels in your plasma and your body.
  • They control nervous-system function.
  • They move nutrients into your cells and carry waste out.
  • They balance the amount of water in your body, maintaining fluid balance through osmosis.
  • They regulate blood pressure.
  • Electrolytes help rebuild damaged tissue after exercise.
The average person can get all the electrolytes they need through a nutritious diet, including miso. Because it contains several nutrients and health benefits, miso is a much better choice than sports drinks for replacing electrolytes. The next time you run a marathon, consider filling your water bottle with miso and water instead of plain H2O. 
 

Ways to use miso

The obvious way is soup. It can be a simple water-miso mixture, a water-miso-tofu-onion combination, or something more elaborate with carrots, celery, ginger, mushrooms, egg, sesame oil and added stock. Start with this video or this recipe for inspiration.

Blend it with some sesame oil, olive oil, ginger, rice vinegar, soy sauce and maple syrup (if you like it sweet) as a salad dressing. 

Make a glaze, sauce or marinade with those same flavours.

Miso goes well with tahini in sauces. Try a miso sauce in a cold noodle salad.

Add it to a stir fry.

Mix it with mayo or cream cheese to spread on a freshly baked Soul Provisions baguette.

If the phrase “salty and sweet” excites you, do a recipe search for miso and white chocolate cookies or miso chocolate chip cookies. The Food Network and Bon Appetite have such recipes. The New York Times has a recipe for miso peanut butter cookies.

If you’re someone who starts their day by drinking warm lemon water, consider occasionally swapping it for miso water. Both are healthy ways to hydrate in the morning, but it’s good to switch things up - and sometimes you run out of lemons. 
Can miso paste go bad?
Photo by Ryan Jvr on Unsplash

No boiling

When mixing miso with water, use hot water that hasn’t reached the boiling point. Boiling miso kills the enzymes. 

If you’re using miso in a cooked sauce, glaze, or a more elaborate soup, take the pot off the stove before whisking in the miso. The recipe should tell you.

If you’re baking with miso, the enzymes will be killed and the cookies will console you.

Can miso paste go bad?

Miso can be kept for a long period of time because of its salt content. If kept in your refrigerator, the miso itself does not go bad. In terms of the quality of the taste, miso should remain relatively consistent for up to one year. Store it in the refrigerator. 

Other fermented foods

Fermented foods that are a good source of probiotics
  • Sauerkraut (unpasteurized, naturally fermented)
  • Kombucha - the smell tells you it’s fermented.
  • Kimchi and gojuchang
  • Lacto-fermented pickles - that is, pickles preserved in brine rather than vinegar.
  • Yogurt, buttermilk, kefir and cheese with live and active cultures
  • Raw apple cider vinegar.
The next time you go for sushi, order miso soup. 

Watch our website for miso soup.

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