📊 Full nutrition facts — per 100g (raw)
| Nutrient | Amount | % Daily value | Level |
|---|---|---|---|
| Calories | 343 kcal | 17% | |
| Carbohydrates | 71.5g | 24% | |
| Dietary fibre | 10.0g | 36% | |
| Protein | 13.3g | 27% | |
| GI | ~45 — Low | — | |
| Rutin | very high | — | |
| Magnesium | 231mg | 58% | |
| Manganese | 1.3mg | 65% | |
| Phosphorus | 347mg | 35% | |
| Copper | 1.1mg | 55% | |
| Niacin B3 | 7.0mg | 47% | |
| Zinc | 2.4mg | 20% |
Based on Australian NRV. Source: FSANZ and USDA Food Composition Databases.
📈 Glycaemic index (GI)
💊 Key vitamins & minerals
✅ Health benefits
Buckwheat contains D-chiro-inositol (DCI), a rare cyclitol compound that acts as a second messenger for insulin signalling. DCI has been shown in clinical research to significantly reduce post-meal blood glucose and improve insulin sensitivity. The DCI in buckwheat is believed to be a key mechanism behind buckwheat's notably lower GI compared to other starchy grains. DCI is also being studied for polycystic ovary syndrome (PCOS), where it reduces androgens and improves insulin resistance in several clinical trials.
Buckwheat is the richest dietary source of rutin — a flavonoid glycoside with well-documented effects on vascular health: it strengthens capillary walls, reduces capillary permeability, inhibits platelet aggregation and has anti-inflammatory properties. Rutin has been used as a pharmaceutical agent for chronic venous insufficiency and capillary fragility. Traditional Chinese, Japanese and European herbal medicine all used buckwheat specifically for vascular conditions. The rutin content of buckwheat groats is 10–30mg per 100g — meaningful at normal serving sizes.
Buckwheat provides 13.3g of protein per 100g — unusually high for a grain-like food — and unlike most grains, buckwheat protein contains all nine essential amino acids in reasonably balanced proportions. Critically, buckwheat has the highest lysine content of any grain or pseudo-grain (including quinoa) — a significant advantage since lysine is the limiting amino acid in most plant proteins. For plant-based diets, buckwheat as a grain replacement provides more complete protein than wheat, rice or oats.
Buckwheat provides 231mg of magnesium per 100g — 58% of the daily requirement and among the highest of any grain or seed. Magnesium is essential for over 300 enzyme reactions, neural signal transmission, muscle relaxation, blood pressure regulation and sleep quality. Magnesium deficiency is one of the most common nutrient deficiencies in modern diets (affecting an estimated 50% of Australians). Regular buckwheat consumption provides a practical, whole-food magnesium source that is highly bioavailable.
⚠️ Who should limit or avoid
Buckwheat allergy is rare but can be severe — including anaphylaxis. It is more common in Asian countries (particularly Japan and Korea) where buckwheat consumption is high, and is underdiagnosed in Western countries because buckwheat is less commonly eaten. Buckwheat proteins (particularly a 24 kDa protein) can cross-react with latex and other allergens. People with known seed or grain allergies should introduce buckwheat cautiously. Anyone experiencing throat tightening, hives or breathing difficulty after eating soba noodles or buckwheat products should seek immediate medical attention and allergy testing.
Buckwheat contains fagopyrin, a photoactive compound that can cause photosensitisation (sensitivity to sunlight causing skin rash or burning) when consumed in very large amounts — primarily reported in animals eating buckwheat forage, and in humans consuming extremely large quantities of buckwheat sprouts or supplements. This is not a concern at normal dietary amounts (a serving of soba noodles or buckwheat groats). Buckwheat sprout supplements at high doses warrant caution.
Buckwheat itself is gluten-free, but most commercial soba noodles contain a significant proportion of wheat flour — typically 20–80% wheat. 100% buckwheat soba (juwari soba) is available but more expensive and less common. People with coeliac disease must read labels carefully and choose certified 100% buckwheat products or certified gluten-free buckwheat groats.
🛒 How to source & use buckwheat
Buckwheat groats (raw): hulled buckwheat seeds with a pale green-white colour — most nutritious and versatile. Cook like rice (1:2 ratio, 15 minutes). Kasha: toasted buckwheat groats — dark brown, stronger nutty flavour, slightly reduced rutin content from toasting. Excellent as a pilaf or porridge. Buckwheat flour: use for pancakes (blini), galettes and gluten-free baking. Soba noodles: Japanese buckwheat noodles — check label for wheat content if gluten-free required (100% buckwheat soba = juwari soba).
Rinse groats thoroughly (they can be dusty). Optional but recommended: toast dry in a pan 3–4 minutes until fragrant — this creates kasha and prevents the groats from becoming gluey. Add 1 cup groats to 2 cups boiling salted water, reduce to lowest simmer, cover tightly, cook 12–15 minutes until water is absorbed. Rest covered 5 minutes. Correct cooked texture: firm, separate and nutty — NOT mushy. Mushy buckwheat means too much water or overcooked. It works beautifully as a rice substitute in stir-fries, grain bowls and salads.
Soba noodles: cook 4–5 minutes in boiling water, drain immediately, rinse cold — serve cold with tsuyu dipping sauce or hot in broth. Buckwheat pancakes (blini): mix flour, egg, milk, butter — thin crepes with a pleasantly earthy flavour. Galettes bretonnes: thick savoury buckwheat pancakes filled with egg, cheese, ham — a Brittany specialty. Buckwheat porridge: simmer groats in milk or water with a little salt and honey. Tabbouleh-style salad: cooked cooled groats with herbs, tomato, cucumber, lemon.
🧊 Storage tips & shelf life
Buckwheat groats store well in a sealed container at room temperature. The intact hull provides protection. Buckwheat flour is more perishable due to the exposed germ oils — store in a cool pantry for 3–4 months maximum. Fresh buckwheat flour has a faintly earthy, pleasant smell; rancid flour smells sharp and acrid. Kasha (toasted groats) stores similarly to raw groats.
Refrigerating buckwheat flour significantly extends freshness by slowing oil oxidation. Cooked buckwheat groats refrigerate well for 4–5 days — they firm up slightly but reheat well with a splash of water. Cooked buckwheat is excellent for meal prep: cook Sunday, use as a grain base throughout the week in bowls, salads and stir-fries.
Both raw groats and buckwheat flour freeze excellently with minimal quality loss. Cooked buckwheat also freezes well in portions — freeze in 150g lots, reheat with a little water. The rutin content is well-preserved in freezing. Ideal for buying in bulk from health food stores when on special and freezing for year-round use.
📖 About buckwheat — complete guide
Buckwheat (Fagopyrum esculentum) is a fascinating botanical outlier — it is not a grass and not a true grain, but a dicotyledonous flowering plant related to sorrel, dock and rhubarb in the family Polygonaceae. The seeds that we eat as 'buckwheat' are technically achenes — a type of dry fruit. The name 'buckwheat' derives from the Dutch 'boekweit' (beech wheat) — a reference to the seed's triangular shape resembling beech nuts, and its wheat-like culinary use. Buckwheat was first cultivated in Southeast Asia approximately 8,000 years ago, spread westward through central Asia to reach Europe by the 14th–15th century (carried along the Silk Road), and was brought to the Americas by European colonists in the 17th century. It became a staple crop in cold, mountainous and poor-soil regions where wheat and other cereals grew poorly — explaining its importance in Japanese mountain cuisine, Russian peasant cooking and Breton French tradition.
The discovery of D-chiro-inositol (DCI) in buckwheat has driven significant clinical research into the grain's anti-diabetic properties. DCI is a naturally occurring cyclitol that acts as a second messenger for insulin — it amplifies insulin signalling at the cellular level. Multiple studies have found that DCI supplementation significantly reduces insulin resistance and improves blood glucose control. The clinical research on DCI for PCOS (polycystic ovary syndrome) — where it reduces testosterone, improves ovulation and insulin sensitivity — is now substantial enough that DCI is being integrated into PCOS management guidelines in some countries. Buckwheat is the most practical whole-food dietary source of DCI. The combination of DCI, rutin (which reduces capillary permeability and oxidative stress in blood vessels), high magnesium (which potentiates insulin signalling) and resistant starch creates a multi-mechanism anti-diabetic food profile that is genuinely distinct from other grains.