Science in a Spoon: Why a Nutritional Scientist Recommends These Japanese Miso Spots
Did you know that Wanping AW, the founder of TokudAw, is actually a nutritional scientist with a published track record of papers related to nutrition? (You can check out her work here: Wanping AW's Google Scholar Profile). That means she knows all the scientific facts about miso—like that it's officially classified as a "functional food" because it's a complex delivery system for bioactive compounds.
Today, we wrote something interesting about Japanese soy hero-Miso, as it's April, which is #nationalsoymonth in the USA.
Why is this little paste such a health hero? Well, the magic happens in a two-stage fermentation process. The first stage is the Koji Starter, where a substrate (usually rice, barley, or soybeans) is inoculated with the mold Aspergillus oryzae. This step creates essential enzymes, particularly amylases and proteases, which break down complex starches and proteins. The second stage is Secondary Fermentation. The Koji is mixed with cooked soybeans and salt, and then lactic acid bacteria and yeasts ferment the mixture for periods ranging from weeks to several years. This specific microbial community is crucial for developing miso’s unique bioactive profile, flavor (umami), and texture. The TokudAw team did a team building activity making miso together, here is a video: Miso Making
This long, careful process is why miso is a nutritional powerhouse:
Proteins & Peptides: It has high vegetable protein content, which is pre-digested by enzymes into easily absorbable amino acids and bioactive peptides.
Isoflavones: It's rich in genistein and daidzein, which are linked to various metabolic benefits.
Micronutrients: It contains significant levels of Vitamin B complex (B12 and B6), Vitamin K, and minerals such as calcium, iron, and potassium.1
Beyond the basic nutrients, research shows amazing therapeutic potential:
Anticancer Activity: Miso consumption may reduce the risk of certain cancers (particularly breast and colon cancer), attributed to isoflavones and fermentation byproducts like ethyl-cholestane
Cardiovascular Health: Despite its salt content, studies show miso has an antihypertensive effect, helping regulate blood pressure via ACE-inhibitory peptides. It also exhibits anticholesterolemic effects that help lower LDL cholesterol.
Antiobesity: Research indicates that miso can suppress visceral fat accumulation.
Gastrointestinal Health: As a fermented food, it acts as a probiotic source, improving gut microbiota diversity.
Radio-protective Effects: Historical and clinical observations suggest it may help eliminate or mitigate the effects of radioactive substances from the body.
But forget the textbooks for a minute. We're here to talk about the truly fun part of miso: the authentic flavors you discover when you travel! Our ultimate, absolute favorite spot has to be Ishii Miso in beautiful Matsumoto City, Nagano Prefecture.
This isn't just a store; it’s an experience. There is also a free guided tour available in English. We love starting with a simple, satisfying lunch: perfectly grilled onigiri, crisp pickles, and a soul-warming bowl of their 3-year fermented miso soup.
TokudAw founders and the 6th-generation leader of the 150+ year-old Ishii Miso — Mr. Kosuke Ishii
Once lunch is done, it's time for the treats! We always make sure to grab the legendary miso candy—a perfect mix of sweet and salty, with a delightful peanut center—and you absolutely cannot leave without a scoop of their surprisingly delicious miso ice-cream. If you're ever passing through Tokyo and need a quick, high-quality miso soup fix, our favorite stop is KAYANOYA Dashi Shiruya Tokyo Station Shop in Gransta Marunouchi, right inside Tokyo Station. While it’s easy to drop by, the flavor is deeply authentic. This shop is run by Kayanoya—a seasoning manufacturer whose parent company is Kuhara Shoyu, established way back in 1893—and they serve miso soup made with their carefully perfected dashi.
Read more about the other unique must-try Japanese foods for your next trip here.
