Daikon Radish
Food · Vegetable · Food, Typed Supps
Daikon is a crunchy, watery radish that's low in calories but surprisingly high in vitamin C, and its natural enzymes may give your stomach a small hand with starchy food.
Stage by stage
- Enzyme Release (Mouth): Chewing or grating raw daikon ruptures its cells, triggering myrosinase to convert glucosinolates into pungent isothiocyanates while releasing enzymes such as amylase.
- Gastric Digestion (Stomach): In the stomach, daikon's high water and fiber content add bulk to the meal while gastric acid breaks down the plant tissue and inactivates much of its raw enzyme activity.
- Nutrient Absorption (Small Intestine): The small intestine absorbs daikon's vitamin C, potassium, and folate along with isothiocyanate metabolites generated during chewing or preparation.
- Circulation & Use (Bloodstream): Absorbed vitamin C and potassium circulate in the blood, supporting immune function, antioxidant activity, and fluid balance throughout the body.
Timing
Daikon is traditionally eaten as a fresh side dish or condiment alongside a meal, such as grated daikon oroshi served with tempura or grilled fish, rather than consumed alone the way a targeted supplement would be.
Time to effect
- Seconds to Weeks: The peppery bite from isothiocyanate formation appears within seconds of cutting or chewing, while measurable contributions to vitamin C or potassium status depend on consistent intake over days to weeks.
Allergens
None of the fourteen major allergens. Derived from what this food is, not from a product label.
Eating patterns
Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Keto, Low-FODMAP, Gluten-free.
In season
April to September in the northern hemisphere, October to March in the southern.
Satiety
The satiety index is measured on 240 kcal servings. At 18 kcal per 100 g that is 1.3 kg of this, which is not a serving anyone eats — so the index has nothing to say about it.
Environmental footprint
0.4 kg CO2e and 28 litres of freshwater per kg, matched to "Root vegetables" in Poore & Nemecek (2018), Science 360.
Cost band
Cheap — roughly £2.5 per kg, as a band midpoint rather than a price.
Key nutrients
Nutrition per 100g
- Calories: 18
- Protein: 0.6g
- Carbohydrate: 4.1g
- of which sugars: 2.5g
- Fat: 0.1g
- of which saturated: 0g
- Fibre: 1.4g
- Sodium: 21mg
Food vs. supplement
Whole daikon delivers vitamin C, potassium, fiber, and glucosinolate compounds together in a low-calorie, high-water package that an isolated vitamin C or potassium supplement cannot replicate.
Kitchen tip
Grate or slice daikon just before eating, and favor raw or lightly pickled preparations if you want to preserve more of its vitamin C and natural enzyme activity, since both fade with heat and storage time.
Common myth
"Raw daikon's natural enzymes digest fatty or fried food for you, so eating it with tempura or grilled meat cancels out the grease." In reality: Raw daikon juice does contain measurable amylase, diastase, and esterase activity, but these enzymes primarily act on starches rather than fats, and their activity is substantially reduced by cooking and by stomach acid; controlled human trials showing a meaningful fat-digesting benefit from pairing daikon with fried food are lacking.
Recipes that use it
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