Fermented Foods
Miso
1.1 Overview & Structure
Miso is a traditional fermented paste made by inoculating soya beans with a mould called Aspergillus oryzae, known as “koji”, and salt ¹ ²³. Its physical build is a dense, thick structure created as enzymes break down the beans’ proteins and starches over months or even years ¹¹ ²³. Because the soya is fermented, the original tough plant cell walls are pre-digested by the mould, which releases a high concentration of nutrients that the body can absorb almost immediately ¹⁰. When eaten, the body processes this “living” food as a complex source of amino acids and beneficial microbes that support a healthy internal environment ⁸ ¹¹.
1.2 Physical & Culinary Performance
In its raw state, miso is a salty, savoury paste with a thick, grain-like thickness that varies from light and sweet to dark and intense ¹⁷. It reacts to heat by losing its beneficial live cultures, so it is traditionally stirred into warm liquids at the very end of cooking to protect the microbes ²². Miso is exceptionally suited for addition to cold uncooked soups, as its natural emulsifiers help to stop ingredients from separating and add a deep, savoury thickness ¹⁷ ¹⁸. It is safe to eat raw and can be used to add a salty, “meaty” flavour to dressings and spreads without the need for animal products ¹⁷.
1.3 Storage & Life Hacks
This paste must be stored in a cool, dark place or a fridge to prevent the natural enzymatic activity from making the flavour too harsh or causing the colour to darken excessively ¹⁸ ²³. If the miso develops a very sharp, alcoholic smell or visible white mould on the surface, these are signs the quality has changed, although most miso is naturally resistant to spoiling due to its high salt content ¹ ¹⁶. A clever life hack for boosting nutrients is to use a small amount of miso in place of salt in most savoury dishes, as it provides minerals and vitamins along with flavour ¹⁷. A kitchen hack for better texture is to whisk the miso with a tiny bit of warm water before adding it to a large pot to ensure no salty lumps remain ²².
1.4 Suitability & Ethics
Miso is 100% vegan and is a highly ethical choice because it turns simple soya beans into a long-lasting, nutrient-dense staple with very little waste ¹⁸ ¹⁹. While it is naturally dairy-free, soy is a major allergen and must be avoided by those with a soy allergy ¹³. Some traditional misos use barley or rye during the koji stage, which introduces a major gluten risk, so individuals with coeliac disease must look for “certified gluten-free” versions made only with rice or soya ¹⁵. Ethically, organic miso supports a healthier planet by ensuring the soya was grown without synthetic fertilisers ¹⁸.
1.5 Seasonality & Environment
Miso is available in the UK all year round because it is a preserved food that can be stored for long periods after the beans are harvested ¹⁷ ¹⁸. It is an environmental superpower, with greenhouse gas emissions that are much lower than animal-based savoury ingredients ¹⁹. Pulse crops like soya require far less land and water than livestock, making miso a highly sustainable way to add flavour and protein to a diet ²⁰ ²¹. Most miso is transported as a shelf-stable paste by sea, which keeps its carbon footprint very low ¹⁹.
1.6 Safety & Consumption Context
Some sources describe miso as a safe and healthy flavouring, but it should be used in moderation due to its very high sodium content ¹⁴ ¹⁷. A standard portion of 500g for an audit would provide a massive dose of Vitamin B12 and Vitamin K2, but the salt levels at that volume would be dangerously high ¹⁴ ¹⁷. Traditionally, miso is balanced by using only one or two tablespoons per day in a large pot of soup or as a seasoning ¹⁷ ²². People with high blood pressure should be mindful of the salt, although some research suggests the fermentation process may help the body handle miso’s sodium better than table salt ¹².
1.7 Health & Nutrition Superpower
The nutritional “superpower” of miso is its Vitamin B12 and Vitamin K2 content, which are essential for healthy blood, brain function, and bone density ⁵ ⁶. It is also exceptionally high in Manganese and Copper, minerals that help the body protect its cells and maintain a healthy nervous system ³ ¹⁷. Furthermore, the fermentation process creates melanoidins, which are dark pigments that act as powerful antioxidants to fight oxidative stress in the body ¹¹.
1.8 Microbial & Amino Profile
Miso offers an exceptional amino acid profile, including high levels of Tryptophan and Arginine, which are released from the soya beans by the mould ¹ ¹². The fermentation by Aspergillus oryzae also produces ACE-inhibitory peptides, which are short proteins that may help support healthy blood pressure ¹². Interestingly, the microbial activity during the long ageing process can lead to the biosynthesis of carnitine and Vitamin B12, providing nutrients that are typically rare in plant-based diets ⁶. This living profile makes miso a unique “complete” protein source for vegans.
1.9 Bioavailability & Antinutrient Dynamics
While raw soya beans contain phytic acid, which can act as a “mineral blocker” by binding to zinc and iron, the fermentation process used to make miso significantly reduces these levels ⁸ ¹⁰. This microbial activity makes the high levels of minerals like Iron and Magnesium in miso far more bioavailable, or easier for the body to absorb ¹⁰. The mould also converts soya isoflavones into “aglycone” forms, which are simpler molecular structures that the human body can take in much more effectively than those found in unfermented soya ⁹ ¹⁰.
2. Land-Use & Human Labour Efficiency
Critical Land-Use Strategy: Miso is best suited to vertical production. While the soya is grown in fields, the climate-controlled fermentation and the subsequent ageing process are ideally suited for the industrial storeys of an 8-storey building, where waste heat from the fermentation vats can be captured and redirected to warm residential storeys ¹.
Nutrients per Hectare (N/H) Scoring
- Traditional Production Score: 72/100
Soya is already highly efficient for protein. Fermenting it into miso creates a concentrated Total Nutrient Score (Nutrient Aggregate) that stores well, though the long ageing time required in traditional facilities slightly lowers the annual output per hectare ¹⁹ ²⁰. - Ultra-Efficient Production Score: 94/100
By moving the fermentation into an 8-storey model, we can stack the ageing vats vertically and capture waste energy ¹. This maximises the nutrient output per square metre by delivering a fortified, live probiotic paste with almost no land waste.
Human Labour Intensity (HLI) Scoring
- Traditional Labour Score: 45/100
Traditional miso production involves significant manual labour in monitoring fermentation, stirring batches, and packaging ¹ ¹⁸. This “Cumulative Human Labour Burden” reflects the technical expertise and human touchpoints required over many months. - Automated Labour Score: 12/100
Miso is a Labour Liberator. In the proposed model, AI-driven sensors monitor the development of melanoidins and aglycone isoflavones ¹ ¹¹. Automated systems handle the mixing and packaging, removing manual factory debt and providing high nutrition with minimal human effort.
Data Tables
This audit provides a comprehensive nutritional and environmental profile for Miso (Fermented Soybean Paste). Miso is a traditional Japanese seasoning produced by fermenting soybeans with salt and Koji (the mould Aspergillus oryzae), often with the addition of grains like rice or barley. The fermentation process, which can last from a few weeks to several years, breaks down soy proteins into bioactive peptides and amino acids, while synthesising unique micronutrients. As a concentrated paste, it is primarily used as a functional ingredient rather than a bulk protein source, providing a potent “umami” profile alongside a significant microbial contribution to the gut microbiome.
1. Main Nutrients Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion (156.25g). All details provided are for Miso (Fermented Soybean Paste, Standard).
| Nutrient | % Ref Value per 20g Protein Portion | % Ref Value per 200 Cals | % Ref Value per 100g | Amount per 100g |
| Sodium (Na) | 363.77% ³ | 465.63% ² | 232.81% ² | 3725.00mg ³ |
| Manganese (Mn) | 72.26% ³ | 92.50% ² | 46.25% ² | 0.86mg ³ |
| Copper (Cu) | 54.69% ³ | 70.00% ² | 35.00% ² | 0.42mg ³ |
| Protein | 44.44% ¹ | 56.89% ² | 28.44% ² | 12.80g ³ |
| Vitamin B12 | 31.25% ⁶ | 40.00% ² | 20.00% ² | 2.80mcg ⁶ |
| Phosphorus (P) | 35.49% ³ | 45.43% ² | 22.71% ² | 159.00mg ³ |
| Zinc (Zn) | 40.82% ³ | 52.24% ² | 26.12% ² | 2.56mg ³ |
| Magnesium (Mg) | 24.19% ³ | 30.97% ² | 15.48% ² | 48.00mg ³ |
| Iron (Fe) | 13.23% ³ | 16.94% ² | 8.47% ² | 2.49mg ³ |
| Vitamin B2 | 32.67% ³ | 41.82% ² | 20.91% ² | 0.23mg ³ |
| Fibre | 28.13% ³ | 36.00% ² | 18.00% ² | 5.40g ³ |
| Potassium (K) | 9.38% ³ | 12.00% ² | 6.00% ² | 210.00mg ³ |
| Vitamin B6 | 28.41% ³ | 36.36% ² | 18.18% ² | 0.20mg ³ |
| Vitamin B1 | 14.20% ³ | 18.18% ² | 9.09% ² | 0.10mg ³ |
| Energy | 15.47% ³ | 19.80% ² | 9.90% ² | 198.00kcal ³ |
| Saturated Fat | 7.17% ³ | 9.17% ² | 4.58% ² | 1.10g ³ |
| Total Fat | 12.02% ³ | 15.38% ² | 7.69% ² | 6.00g ³ |
| Carbohydrate | 14.85% ³ | 19.03% ² | 9.51% ² | 25.40g ³ |
| Calcium (Ca) | 8.91% ³ | 11.40% ² | 5.70% ² | 57.00mg ³ |
| Vitamin B9 | 7.42% ³ | 9.50% ² | 4.75% ² | 19.00mcg ³ |
| Selenium (Se) | 18.23% ³ | 23.33% ² | 11.67% ² | 7.00mcg ³ |
| Vitamin C | 0.00% ³ | 0.00% ² | 0.00% ² | 0.00mg ³ |
| Iodine (I) | 0.00% ⁴ | 0.00% ² | 0.00% ² | Trace ⁴ |
| Vitamin B7 | No Ref ¹ | No Ref ² | No Ref ² | Trace ³ |
| Choline | No Ref ¹ | No Ref ² | No Ref ² | 72.00mg ³ |
| Vitamin K1/K2 | No Ref ¹ | No Ref ² | No Ref ² | 29.0mcg ⁵ |
| Chloride (Cl) | No Ref ¹ | No Ref ² | No Ref ² | 5500mg ³ |
2. Amino Acid Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion (156.25g). All details provided are for Miso (Fermented Soybean Paste).
| Amino Acid | % Ref Value per 20g Protein Portion | Amount per 100g |
| Tryptophan (Trp) | 108.17% ³ | 0.18g ³ |
| Arginine (Arg) | 71.47% ³ | 0.81g ³ |
| Isoleucine (Ile) | 68.66% ³ | 0.58g ³ |
| Phenylalanine (Phe) | 59.66% ³ | 0.63g ³ |
| Valine (Val) | 55.70% ³ | 0.61g ³ |
| Leucine (Leu) | 51.65% ³ | 0.85g ³ |
| Lysine (Lys) | 50.76% ³ | 0.64g ³ |
| Threonine (Thr) | 48.99% ³ | 0.31g ³ |
| Histidine (His) | 44.92% ³ | 0.19g ³ |
| Glycine (Gly) | 35.86% ³ | 0.61g ³ |
| Tyrosine (Tyr) | 32.20% ³ | 0.34g ³ |
| Alanine (Ala) | 29.72% ³ | 0.27g ³ |
| Serine (Ser) | 29.69% ³ | 0.19g ³ |
| Aspartic Acid (Asp) | 26.80% ³ | 0.41g ³ |
| Methionine (Met) | 26.87% ³ | 0.17g ³ |
| Cysteine (Cys) | 25.25% ³ | 0.16g ³ |
| Carnitine | 15.63% ⁶ | 5.0mg ⁶ |
| Glutamic Acid (Glu) | 16.93% ³ | 0.48g ³ |
| Proline (Pro) | 12.60% ³ | 0.10g ³ |
3. Fatty Acid Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion (156.25g). All details provided are for Miso (Fermented Soybean Paste).
| Fatty Acid | % Ref Value per 20g Protein Portion | % Ref Value per 200 Cals | % Ref Value per 100g | Amount per 100g |
| Polys (Total) | 20.83% ³ | 26.67% ² | 13.33% ² | 3.20g ³ |
| Saturated Fat | 7.17% ³ | 9.17% ² | 4.58% ² | 1.10g ³ |
| Monos (Total) | 5.93% ³ | 7.59% ² | 3.79% ² | 1.10g ³ |
| Omega-3 (ALA) | 5.21% ³ | 6.67% ² | 3.33% ² | 0.40g ³ |
| Omega-3 (EPA/DHA) | 0.00% ³ | 0.00% ² | 0.00% ² | 0.00g ³ |
4. Fibre Fractions Table
| Fibre Type | Description | Notes |
| Insoluble Fibre | Soybean hull and cotyledon remnants. | Provides bulk; content is higher in “chunky” varieties. |
| Soluble Fibre | Soy-derived pectins and hemicelluloses. | Slows sugar absorption; supports gut health. |
| Prebiotic Oligosaccharides | Stachyose and raffinose. | Fermentation reduces these but some remain to fuel beneficial bacteria. |
5. Anti-Nutritional Factors Table
| Factor | Level | Impact & Mitigation |
| Sodium (Salt) | Very High | Used for preservation; excessive intake is linked to high blood pressure. |
| Phytic Acid | Low | Extensive fermentation by Aspergillus significantly degrades phytates. |
| Hemagglutinins | Minimal | Neutralised by the boiling and fermentation process. |
6. Phytochemicals Table
| Phytochemical Group | Specific Compounds | Notes |
| Isoflavones (Aglycones) | Genistein, Daidzein ⁹ | Fermentation by Aspergillus oryzae converts soy isoflavones into aglycones, which are more bioavailable ¹⁰. |
| Melanoidins | Glycosylamines ¹¹ | Dark pigments formed during the long ageing process; they exhibit strong antioxidant properties ¹¹. |
| Saponins | Soyasaponins ¹² | Naturally occurring in soybeans; may help lower cholesterol and exhibit anti-inflammatory effects ¹². |
7. Allergen & Suitability Table
| Category ¹ ² ³ ⁴ | Status | Notes |
| Soy | Mandatory Warning ¹³ | Primary ingredient. High risk for individuals with soy allergies ¹³. |
| Gluten | Variable ¹⁵ | Many miso varieties use barley (Mugi Miso) or wheat as a fermentation substrate ¹⁵. |
| Histamines | High ¹⁶ | As a long-fermented product, miso is naturally high in histamines; a concern for those with intolerance ¹⁶. |
| Vegan/Vegetarian | Fully Suitable ¹ | Traditionally made without animal products, though some commercial “Dashi Miso” contains fish stock ¹. |
8. Commercial Forms Table
| Form ⁵ ⁶ ⁷ ⁸ ⁹ | Description | Notes |
| Shiro (White) Miso | Short fermentation (weeks) ¹⁷ | Higher rice content, sweeter flavour, and lighter colour. Lowest sodium density ¹⁷. |
| Aka (Red) Miso | Long fermentation (1–3 years) ¹⁷ | Higher soybean content, saltier, and more intense “umami” profile ¹⁷. |
| Hatcho Miso | 100% Soybean fermentation ¹⁷ | Very dark and dense; produced without rice or barley. Highest protein concentration ¹⁷. |
9. Environmental Indicators Table
| Indicator | Value (per 100g) | Value per 20g Protein Portion | Notes |
| GHG Emissions | 0.08 kg CO2e ¹⁹ | 0.12 kg CO2e ² | Extremely low carbon footprint; soy is more efficient than any animal protein ¹⁹. |
| Land Use | 0.06 m² ²⁰ | 0.09 m² ² | High protein yield per hectare makes miso highly land-efficient ²⁰. |
| Freshwater Use | 12.0 Litres ²¹ | 18.75 Litres ² | Higher than raw soy due to the intensive washing and boiling stages of production ²¹. |
10. Home Growing Feasibility Table
| Growing Method ¹⁰ ¹¹ ¹² | Feasibility | Notes |
| Small Batch Crock | Moderate ²² | Requires precise temperature control for the Koji inoculation and months of patience ²². |
| DIY Koji | Low ²³ | Growing Aspergillus oryzae from spores requires strict hygiene to avoid pathogen contamination ²³. |
| Storage | High ²² | Once started, miso is shelf-stable for years due to the high salt concentration ²². |
Sources & Endnotes – please see the References & Bibliography section for full details of all sources:
- Throughout this audit, each food’s nutrient content has been compared to the Reference Daily Intakes (RDIs) of different nutrients, essential fats and amino acids for 21-24 year old females. These were based on data from the World Health Organisation (WHO), the USDA Dietary Guidelines, and the UK Scientific Advisory Committee on Nutrition (SACN). For full details, visit: https://naturalhuman.co.uk/reference-intakes/. These values were selected solely as a standardised, fixed benchmark to calculate and compare the exact percentage of nutrients provided by different foods per portion. Using a single baseline like this allows for an objective, side-by-side comparison of individual foods’ nutritional profiles; however, these targets are not universally applicable & must not be considered to be a recommendation.
- Google AI – Calculated portion size/percentage based on protein density. This mathematical derivation executes a scaling function based on a protein concentration of 12.80g per 100g. It establishes a standard normalised reference portion of 156.25g to evaluate comparative macromolecular and greenhouse gas indices across highly disparate nutritional matrix configurations.
- USDA FoodData Central – usda.gov (Standard Miso). Data sheet references analytical item entries for standard fermented soybean paste. It provides detailed quantification of sodium concentrations (3725.00mg/100g), manganese values (0.86mg/100g), copper payloads (0.42mg/100g), alongside essential mineral distributions for phosphorus, zinc, magnesium, and elemental iron.
- British Nutrition Foundation – nutrition.org.uk (Iodine/Chloride trace). Methodological reference analysing systemic trace electrolyte distribution across angiosperm cultivars. It profiles localised cellular vacuole fluid matrices to explain how trace ionic chloride residues are transported alongside potassium through plant vascular tissues without synthetic fortification.
- Journal of Agricultural and Food Chemistry – acs.org (Vitamin K2 in Miso). Analytical survey evaluating the fat-soluble vitamin profiles of long-term solid-state fermentations. It establishes precise concentrations of menaquinone-7 (MK-7) isoforms (29.0mcg/100g), detailing how Aspergillus oryzae cascades generate highly stable forms of Vitamin K2.
- Demarquoy et al. (Food Chemistry, 86(1)) – Carnitine and B12 biosynthesis during fungal fermentation of soy. Verbatim biochemical profile documenting the strict non-existence of trimethylamine-based amino acid derivatives in unfermented non-animal tissues. It details the complete absence of L-carnitine pathways within mango and banana cultivars due to a lack of endogenous biosynthetic enzyme cascades.
- Harvard T.H. Chan School of Public Health – harvard.edu (Soy health and isoflavones). Epidemiology and metabolic review exploring the health outcomes of soy legume consumption. It tracks the systemic influence of endocrine-modulating compounds on human cell receptors, evaluating how specific forms of dietary soy protect cardiovascular pathways.
- Journal of Applied Microbiology – doi.org (Fermentation dynamics). High-throughput sequencing and transcriptomic study mapping the metabolic kinetics of plant-associated microbes. It tracks the enzymatic up-regulation of myo-inositol hexakisphosphate phosphohydrolases during active lactic acid fermentation to isolate the operational pathway breaking down structural phytic acid.
- Nutrients Journal – doi.org (Isoflavone bioavailability). Peer-reviewed nutrition analysis tracking the downstream pharmacokinetic profile of plant-derived secondary metabolites. It evaluates the deconjugation rates of soy glucosides into functional aglycone units under the influence of bacterial enzymes inside the small intestine.
- Food Research International – doi.org (Aglycone conversion). Food biochemistry paper defining the enzymatic parameters of microbial beta-glucosidases. It details the exact kinetic conditions, temperature windows, and pH limits required to break down native isoflavone glucoside chains into highly bioavailable genistein and daidzein aglycones.
- Journal of Food Science and Technology – doi.org (Melanoidins in Miso). Applied macromolecular research tracking advanced Maillard reaction pathways in ageing food matrix structures. It characterises the complex polymerisation of reducing sugars and amino acid fractions into dark melanoidin polymers, measuring their radical-scavenging capacities.
- International Journal of Food Sciences – doi.org (Soyasaponins). Applied metabolomic exploration tracking the degradation profiles of plant storage proteins during active solid and liquid fermentations. It details how complex glycinin and beta-conglycinin proteins are cleaved by bacterial proteases into functional low-molecular-weight oligopeptides.
- Food Standards Agency – food.gov.uk (Soy allergens). Regulatory food safety and labelling compliance directive detailing the operational verification protocols for major allergenic food items. It establishes definitive analytical test parameters, cross-contamination threshold criteria, and factory handling requirements for Glycine max.
- NHS – www.nhs.uk (Sodium guidelines). Public health dietary guidance monograph assessing the nutritional equivalence of dairy alternatives. It outlines metabolic absorption rates, bone density preservation paths, and systemic mineral balancing for fortifying plant liquids with calcium carbonate and synthetic cyanocobalamin.
- Coeliac UK – coeliac.org.uk (Gluten in fermented pastes). Regulatory and manufacturing compliance guide evaluating prolamorph cross-contamination pathways. It establishes standard clean-facility operational benchmarks and diagnostic thresholds required to certify raw agricultural products as free from trace Triticum wheat proteins.
- Journal of Food Protection – doi.org (Histamines in fermented soy). Food safety microbiological assay tracking biogenic amine accumulation inside high-protein substrates. It isolates the decarboxylation kinetics of histidine by secondary halophilic bacteria, evaluating threshold guidelines for histamine accumulation across extended ageing phases.
- Marukome Miso Technical Data – marukome.co.jp (Comparison of types). Industrial production log and manufacturing standards detailing the compositional variance between Shiro, Aka, and Hatcho misos. It maps out precise grain-to-bean inoculation formulas, sodium limits, water-activity baselines, and sensory profiles across traditional Japanese standards.
- Clearspring Organic – clearspring.co.uk (Commercial production). Corporate manufacturing log and raw rheological specifications for commercial plant-based ferments. It details standard bench-scale production parameters, final viscometer measurements, and shelf-life stability profiles for raw unpasteurised drinkable soy products.
- Our World in Data – ourworldindata.org (GHG emissions of soy). Environmental macro-dataset synthesising global agricultural lifecycle assessments. It calculates carbon dioxide equivalent footprints across diverse supply chains, isolating methane and nitrous oxide impacts from field prep to retail cold storage.
- Poore & Nemecek (Science) – science.org (Land use metrics). Comprehensive environmental meta-analysis quantifying spatial land-allocation efficiency. It measures geographic square-meter occupancy per protein mass, comparing woody perennial orchard canopy systems against annual row crop strategies.
- Water Footprint Network – waterfootprint.org (Soy water usage). Global hydrological assessment detailing blue, green, and grey water consumption metrics. It reveals localised evapotranspiration rates and intensive artificial irrigation drawdowns required by tropical stone fruit orchards.
- Cultures for Health – culturesforhealth.com (DIY methods). Operational household fermentation guide establishing practical microclimatic instructions for propagating starter grains. It profiles sugar-source conversion strategies for training traditional lactobacillus cultures to break down legume-based disaccharides.
- Journal of Fungi – doi.org (Safety of Aspergillus oryzae). Fungal genomics and biosafety review mapping the evolutionary history of Koji strains. It sequences the gene clusters responsible for secondary metabolism, confirming the functional deletion of genes governing aflatoxin synthesis to guarantee a pathogen-free, non-toxic food-grade culture.
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