Miso
Food · Legume · Food, Typed Supps
Miso is fermented soybean paste that adds deep, salty-savory flavor along with gut-friendly bacteria and plant nutrients.
Stage by stage
- Tasting the Umami (Mouth & Saliva): Miso's glutamate and fermented soy compounds trigger umami taste receptors, and saliva begins breaking down its residual starches.
- Acid Breakdown (Stomach): Stomach acid and pepsin dismantle the fermented soybean proteins into shorter peptides, while the acidic environment inactivates most of miso's live bacterial cultures.
- Nutrient Absorption (Small Intestine): In the small intestine, peptides break down into amino acids, and isoflavones, sodium, and trace minerals like manganese and copper are absorbed into the bloodstream.
- Vitamin K2 at Work (Bone & Blood Vessels): Vitamin K2 (menaquinone), produced during fermentation, helps activate proteins that guide calcium into bone and away from artery walls.
Timing
Miso is meant to be eaten with food -- stirred into soup, dressings, or marinades at the end of cooking, since prolonged boiling degrades its enzymes and flavor.
Time to effect
- Days to Months: Digestive and flavor effects are immediate to same-day, but the cardiovascular- and bone-related associations seen in Japanese cohort studies of habitual miso consumption build over months of regular intake.
Allergens
Contains: Soya. Derived from what this food is, not from a product label.
Eating patterns
Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Gluten-free. Depends on the product: Low-FODMAP.
Satiety
156 on the satiety index, where white bread is 100 — high. Modelled from the Holt et al. (1995) measurements.
Environmental footprint
3.2 kg CO2e and 149 litres of freshwater per kg, matched to "Tofu" in Poore & Nemecek (2018), Science 360.
Cost band
Mid — roughly £7 per kg, as a band midpoint rather than a price.
Key nutrients
Nutrition per 100g
- Calories: 199
- Protein: 11.7g
- Carbohydrate: 25.4g
- of which sugars: 6.2g
- Fat: 6g
- of which saturated: 0.9g
- Fibre: 5.4g
- Sodium: 3728mg
Food vs. supplement
Miso provides fermented soy protein, isoflavones, minerals, and live microbial cultures together in a traditional food; no single supplement replicates that whole fermented matrix.
Kitchen tip
Stir miso in at the end of cooking, off the heat, to protect its enzymes and live cultures and to keep its flavor from turning bitter.
Common myth
"Miso is basically just salt paste, so it's as bad for blood pressure as adding table salt to your food." In reality: Despite roughly 3,728 mg of sodium per 100 g (about 162% DV per USDA data), multiple Japanese studies -- including a 5-year cross-sectional health-exam study and controlled trials -- found no significant association between habitual miso soup intake and elevated blood pressure, with some trials showing reduced nighttime blood pressure; researchers attribute this to bioactive peptides generated during fermentation rather than sodium acting alone. People on medically sodium-restricted diets should still count miso toward their daily sodium total.
Recipes that use it
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