Hermetica Superfood Encyclopedia
The Short Answer
Natto is a fermented soybean food containing nattokinase, a fibrinolytic enzyme that breaks down fibrin clots and supports cardiovascular health. It provides high concentrations of vitamin K2 (menaquinone-7) which activates proteins essential for bone mineralization and calcium regulation.
CategoryFermented
GroupFermented Food
Evidence LevelStrong
Primary Keywordnatto benefits
Synergy Pairings4
Natto (Fermented Soybean) — botanical close-up
Health Benefits
Natto is rich in probiotics that support gut health by promoting the growth of beneficial bacteria, improving digestion and nutrient absorption. - It contains nattokinase, an enzyme that can reduce blood clotting, supporting cardiovascular health. - Natto is a good source of vitamin K2, which is essential for bone health by aiding calcium absorption and reducing the risk of osteoporosis. - It may boost the immune system by enhancing the body's natural defenses against infections. - The fermentation process increases the bioavailability of nutrients, making them easier for the body to absorb. - Natto has anti-inflammatory properties that can reduce the risk of chronic diseases by inhibiting inflammatory pathways. - It may help regulate blood pressure by promoting healthy blood vessel function.
Origin & History
Natural habitat
Natto is a traditional Japanese food made from fermented soybeans. The fermentation process involves the use of Bacillus subtilis bacteria, which breaks down the soybeans and produces a sticky, stringy texture. It is commonly consumed in Japan as a breakfast food.
“Natto has been consumed in Japan for over a thousand years, traditionally as a breakfast food. It is valued for its health benefits and distinctive flavor.”Traditional Medicine
Scientific Research
Numerous studies, including randomized controlled trials, have explored natto's cardiovascular and bone health benefits. Meta-analyses support its role in improving gut health.
Preparation & Dosage
Traditional preparation
A typical serving size of natto is 50-100 grams per day. It can be eaten on its own or added to rice and other dishes. Consult a healthcare provider before use.
Nutritional Profile
- High in protein and dietary fiber.
- Contains vitamins such as vitamin K2 and B2.
- Provides minerals like iron, calcium, and magnesium.
How It Works
Mechanism of Action
Nattokinase directly cleaves fibrin and plasmin substrate, enhancing fibrinolysis and reducing blood viscosity through plasminogen activation. Vitamin K2 (MK-7) activates osteocalcin and matrix Gla protein via gamma-carboxylation, directing calcium to bones and away from arteries. Bacillus subtilis probiotics colonize the intestinal tract, producing beneficial metabolites and competing with pathogenic bacteria.
Clinical Evidence
A 12-week randomized trial of 86 participants showed nattokinase (2000 FU daily) reduced systolic blood pressure by 5.5 mmHg compared to placebo. Studies on vitamin K2 from natto demonstrate improved bone mineral density, with one 3-year trial showing 1.3% greater femoral neck density in postmenopausal women. Small-scale studies suggest nattokinase may reduce arterial stiffness, though larger cardiovascular outcome trials are needed. Evidence for probiotic effects relies primarily on observational data from Japanese populations with high natto consumption.
Safety & Interactions
Natto is generally safe but can cause gastrointestinal upset, bloating, or allergic reactions in soy-sensitive individuals. Nattokinase may enhance anticoagulant medications like warfarin, increasing bleeding risk and requiring medical supervision. High vitamin K2 content can interfere with vitamin K antagonist medications, potentially reducing their effectiveness. Pregnant and breastfeeding women should avoid nattokinase supplements due to insufficient safety data, though traditional natto consumption appears safe.
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Frequently Asked Questions
How much nattokinase is in natto?
Traditional natto contains approximately 1000-1500 fibrinolytic units (FU) per 100-gram serving. Commercial nattokinase supplements typically provide 2000-4000 FU per capsule, equivalent to 2-4 servings of natto.
Can natto replace vitamin K2 supplements?
A 100-gram serving of natto provides 800-1000 mcg of vitamin K2 (MK-7), significantly exceeding typical supplement doses of 45-180 mcg. This makes natto one of the richest dietary sources of bioactive vitamin K2.
Does natto interfere with blood thinners?
Yes, natto's nattokinase content can potentiate anticoagulant medications like warfarin, increasing bleeding risk. The vitamin K2 content may also counteract warfarin's effects, making INR levels unpredictable.
How long does nattokinase stay active in the body?
Nattokinase activity peaks 2-8 hours after consumption and remains detectable for up to 24 hours. The fibrinolytic effects gradually decline, which is why daily consumption is typically recommended for sustained benefits.
Is natto safe for people with soy allergies?
Natto may be problematic for individuals with soy allergies, as fermentation doesn't eliminate all allergenic proteins. However, some people with mild soy sensitivities tolerate fermented soy products better than unfermented forms due to protein modification during fermentation.
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