By Alina Petre
Miso is a fermented condiment especially popular in parts of Asia, though it has also made its way to the Western world.
Although miso is still unknown to many, individuals who are familiar with it have most likely consumed it in the form of Japanese miso soup.
It's incredibly nutritious and linked to a variety of health benefits, including better digestion and a stronger immune system.
What Is Miso?
This traditional Japanese condiment consists of a thick paste made from soybeans that have been fermented with salt and a koji starter.
The starter usually contains the Aspergillus oryzae fungus.
Miso paste can be used to make sauces, spreads and soup stock, or to pickle vegetables and meat.
People generally describe its flavor as a combination of salty and umami (savory), and its color can vary between white, yellow, red or brown, depending on variety.
Although miso is traditionally made from soybeans, certain varieties use other types of beans or peas.
Other ingredients may also be used to make it, including rice, barley, rye, buckwheat and hemp seeds, all of which affect the color and flavor of the final product.
Summary: Miso is a paste made from fermented soybeans often mixed with other ingredients. It's a versatile condiment available in many varieties.
It's Rich in Several Nutrients
Miso contains a good amount of vitamins, minerals and beneficial plant compounds. One ounce (28 grams) generally provides you with (1):
- Calories: 56
- Carbs: 7 grams
- Fat: 2 grams
- Protein: 3 grams
- Sodium: 43 percent of the RDI
- Manganese: 12 percent of the RDI
- Vitamin K: 10 percent of the RDI
- Copper: 6 percent of the RDI
- Zinc: 5 percent of the RDI
Interestingly, the varieties made from soybeans are considered to be sources of complete protein because they contain all the essential amino acids needed for human health (1).
That said, miso is also very salty. Thus, if you're watching your salt intake, you may want to ask your health care practitioner before adding large quantities to your diet.
Summary: Miso is a complete source of protein and rich in a variety of nutrients and beneficial plant compounds. However, it is also high in salt.
Miso Improves Your Digestion
Your gut is home to trillions of bacteria.
Some are beneficial, while others are harmful. Having the right type of bacteria in your gut helps you maintain a healthy gut flora.
Having a healthy gut flora is very important because it helps defend your body against toxins and harmful bacteria. It also improves digestion and reduces gas, constipation and antibiotic-related diarrhea or bloating (6, 8, 9).
A. oryzae is the main probiotic strain found in miso. Research shows that the probiotics in this condiment may help reduce symptoms linked to digestive problems including inflammatory bowel disease (IBD) (10).
In addition, the fermentation process also helps improve digestion by reducing the amount of antinutrients in soybeans.
Antinutrients are compounds naturally found in foods, including in the soybeans and grains used to produce miso. If you consume antinutrients, they can bind to nutrients in your gut, reducing your body's ability to absorb them.
Fermentation reduces antinutrient levels in miso and other fermented products, which helps improve digestion (3).
Summary: Miso fermentation helps improve the body's ability to digest and absorb foods. The condiment also contains probiotics that can promote gut health and digestion.
May Reduce the Risk of Certain Cancers
Miso may offer protection from certain types of cancer.
However, despite its high salt content, miso doesn't appear to increase the risk of stomach cancer the way other high-salt foods do.
For instance, one study compared miso to salt-containing foods such as salted fish, processed meats and pickled foods.
The fish, meat and pickled foods were linked to a 24–27 percent higher risk of stomach cancer, whereas miso wasn't linked to any increased risk (12).
Animal studies also report that eating miso may reduce the risk of lung, colon, stomach and breast cancers. This seems especially true for varieties that are fermented for 180 days or longer (15, 16, 17, 18).
Miso fermentation can last anywhere from a few weeks to as long as three years. Generally speaking, longer fermentation times produce darker, stronger-tasting miso.
In humans, studies report that regular miso consumption may reduce the risk of liver and breast cancer by 50–54 percent. The breast-cancer protection appears especially beneficial for postmenopausal women (19, 20, 21).
This condiment is also rich in antioxidants, which may help guard your body's cells against damage from free radicals, a type of cell damage linked to cancer (22).
Nevertheless, more studies are needed before strong conclusions can be made.
Summary: Regular miso consumption may reduce the risk of certain types of cancer. However, more research is needed.
It May Strengthen Your Immune System
Miso contains nutrients that may help your immune system function optimally.
That said, different probiotic strains can have different effects on your health. More studies are needed using miso-specific strains before strong conclusions can be made.
Summary: Miso's rich probiotic content may boost your immune system and help ward off infections. That said, more studies are needed before strong conclusions can be made.
Other Potential Benefits
This Japanese condiment may offer an array of other health benefits:
- May promote heart health: Miso soup may reduce the risk of death from heart disease. However, the protective effects appear to be small and may be specific to Japanese women (26).
- May reduce cholesterol levels: Animal studies show that miso may help reduce levels of "bad" LDL cholesterol in the blood (27, 28).
- May reduce blood pressure: Miso appears to reduce blood pressure in animals. However, results in humans remain divided (15, 29).
- May protect against type 2 diabetes: Some studies show that fermented soy products such as miso may help delay the progression of type 2 diabetes. However, not all studies agree (30, 31).
- May promote brain health: Probiotic-rich foods such as miso may benefit brain health by helping improve memory and reducing symptoms of anxiety, stress, depression, autism and obsessive-compulsive disorder (OCD) (32, 33, 34).
Although these added benefits are encouraging, it's good to note that few studies directly link regular miso to the above benefits. More research is needed.
Summary: Miso consumption is indirectly linked to an array of additional health benefits. However, more miso-specific studies are needed.
Is Miso Safe?
Miso consumption is generally safe for most people.
However, it does contain a large amount of salt. Thus, it may not be a good choice for individuals who need to limit their salt intake due to a medical condition.
In addition, miso is relatively high in vitamin K1, which can act as a blood thinner. If you're taking blood-thinning medications, make sure you consult your health care practitioner before adding it to your diet.
Finally, most varieties are made from soybeans, which could be considered a goitrogen.
Goitrogens are compounds that may interfere with the normal functioning of the thyroid gland, especially in those who already have poor thyroid function.
Summary: Miso is considered safe for most people. Individuals on low-salt diets or blood thinners, or who have poorly functioning thyroid glands, may want to limit their intake.
How to Shop for Miso and How to Use It
In Europe or North America, you can find miso in most Asian grocery stores, as well as some conventional grocery stores.
When you're shopping for miso, consider that color can be a good indicator of taste. That is, darker colors are generally linked with a stronger, saltier taste.
Moreover, it isn't too difficult to make at home. It only requires a few ingredients and some patience. If you want to try it, you can start with this simple recipe (video).
Miso is extremely versatile and can be used in a variety of ways. For instance, you can use it to flavor a broth, marinade or casserole.
You can also blend it with ingredients such as peanut butter, tofu, lemon or apple juice to make dipping sauces or spreads. When combined with oil and vinegar, it yields a simple and tasty salad dressing.
Miso may be best used in cold rather than hot dishes, since its probiotics can be killed by high temperatures. That said, some heat-killed probiotic strains may still provide some benefits, so this topic remains controversial (36, 37).
Unopened miso paste can be kept at room temperature for long periods of time.
However, once you've opened it, make sure to store it in the refrigerator in a closed container and ideally consume it within a year of purchase.
Summary: Miso is an extremely versatile ingredient found in most Asian supermarkets. The tips above can help you add it to your diet.
The Bottom Line
Miso is a nutrient-rich, versatile condiment definitely worth keeping on hand.
The fermentation process used to produce it may be especially beneficial, potentially boosting digestion, aiding the immune system and helping fight disease.
If you're planning to give miso a try, just keep in mind that its flavor can be strong and quite salty. A small amount can go a long way.
Reposted with permission from our media associate Authority Nutrition.
- Redwoods are the world's tallest trees.
- Now scientists have discovered they are even bigger than we thought.
- Using laser technology they map the 80-meter giants.
- Trees are a key plank in the fight against climate change.
They are among the largest trees in the world, descendants of forests where dinosaurs roamed.
Pixabay / Simi Luft<p><span>Until recently, measuring these trees meant scaling their 80 meter high trunks with a tape measure. Now, a team of scientists from University College London and the University of Maryland uses advanced laser scanning, to create 3D maps and calculate the total mass.</span></p><p>The results are striking: suggesting the trees <a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank" rel="noopener noreferrer">may be as much as 30% larger than earlier measurements suggested.</a> Part of that could be due to the additional trunks the Redwoods can grow as they age, <a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank" rel="noopener noreferrer">a process known as reiteration</a>.</p>
New 3D measurements of large redwood trees for biomass and structure. Nature / UCL<p>Measuring the trees more accurately is important because carbon capture will probably play a key role in the battle against climate change. Forest <a href="https://www.wri.org/blog/2020/09/carbon-sequestration-natural-forest-regrowth" target="_blank">growth could absorb billions of tons</a> of carbon dioxide from the atmosphere each year.</p><p>"The importance of big trees is widely-recognised in terms of carbon storage, demographics and impact on their surrounding ecosystems," the authors wrote<a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank"> in the journal Nature</a>. "Unfortunately the importance of big trees is in direct proportion to the difficulty of measuring them."</p><p>Redwoods are so long lived because of their ability to <a href="https://www.nature.com/articles/s41598-020-73733-6" target="_blank" rel="noopener noreferrer">cope with climate change, resist disease and even survive fire damage</a>, the scientists say. Almost a fifth of their volume may be bark, which helps protect them.</p>
Carbon Capture Champions<p><span>Earlier research by scientists at Humboldt University and the University of Washington found that </span><a href="https://www.sciencedirect.com/science/article/pii/S0378112716302584" target="_blank" rel="noopener noreferrer">Redwood forests store almost 2,600 tonnes of carbon per hectare</a><span>, their bark alone containing more carbon than any other neighboring species.</span></p><p>While the importance of trees in fighting climate change is widely accepted, not all species enjoy the same protection as California's coastal Redwoods. In 2019 the world lost the equivalent of <a href="https://www.worldwildlife.org/threats/deforestation-and-forest-degradation" target="_blank" rel="noopener noreferrer">30 soccer fields of forest cover every minute</a>, due to agricultural expansion, logging and fires, according to The Worldwide Fund for Nature (WWF).</p>
Pixabay<p>Although <a href="https://c402277.ssl.cf1.rackcdn.com/publications/1420/files/original/Deforestation_fronts_-_drivers_and_responses_in_a_changing_world_-_full_report_%281%29.pdf?1610810475" target="_blank" rel="noopener noreferrer">the rate of loss is reported to have slowed in recent years</a>, reforesting the world to help stem climate change is a massive task.</p><p><span>That's why the World Economic Forum launched the Trillion Trees Challenge (</span><a href="https://www.1t.org/" target="_blank" rel="noopener noreferrer">1t.org</a><span>) and is engaging organizations and individuals across the globe through its </span><a href="https://uplink.weforum.org/uplink/s/uplink-issue/a002o00000vOf09AAC/trillion-trees" target="_blank" rel="noopener noreferrer">Uplink innovation crowdsourcing platform</a><span> to support the project.</span></p><p>That's backed up by research led by ETH Zurich/Crowther Lab showing there's potential to restore tree coverage across 2.2 billion acres of degraded land.</p><p>"Forests are critical to the health of the planet," according to <a href="https://www.1t.org/" target="_blank" rel="noopener noreferrer">1t.org</a>. "They sequester carbon, regulate global temperatures and freshwater flows, recharge groundwater, anchor fertile soil and act as flood barriers."</p><p><em data-redactor-tag="em" data-verified="redactor">Reposted with permission from the </em><span><em data-redactor-tag="em" data-verified="redactor"><a href="https://www.weforum.org/agenda/2021/03/redwoods-store-more-co2-and-are-more-enormous-than-we-thought/" target="_blank">World Economic Forum</a>.</em></span></p>
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