Red Cabbage
Food · Vegetable · Food, Typed Supps
Red cabbage is green cabbage with a superpower: the purple pigment that gives it color is also a strong antioxidant, and that same pigment changes color when it touches something acidic or basic.
Stage by stage
- Chewing & Release (Mouth): Chewing ruptures red cabbage's plant cells, releasing sulfur compounds and anthocyanin pigments and starting digestion.
- Gastric Breakdown (Stomach): Stomach acid breaks down fiber and begins releasing vitamin C and the red-purple antioxidant pigments.
- Absorption (Small Intestine): The small intestine absorbs vitamin C, vitamin K, and anthocyanins into the bloodstream.
- Liver & Circulation (Liver / Blood): Vitamin K reaches the liver to support synthesis of blood-clotting proteins, while anthocyanins circulate in the blood as antioxidants.
Timing
Pairing red cabbage with a little fat, such as an oil-based dressing, improves absorption of its fat-soluble vitamin K; people on warfarin or other vitamin K antagonist anticoagulants should keep intake of cruciferous vegetables like red cabbage consistent week to week, since sudden changes in vitamin K intake can affect anticoagulant control.
Time to effect
- Weeks: Vitamin C from red cabbage is absorbed and used within days, but the antioxidant benefits linked to its anthocyanin content typically require several weeks of regular consumption to become measurable.
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, Gluten-free. Depends on the product: Low-FODMAP.
In season
September to April in the northern hemisphere, March to October in the southern.
Satiety
The satiety index is measured on 240 kcal servings. At 31 kcal per 100 g that is 784 g of this, which is not a serving anyone eats — so the index has nothing to say about it.
Environmental footprint
0.5 kg CO2e and 76 litres of freshwater per kg, matched to "Brassicas" in Poore & Nemecek (2018), Science 360.
Cost band
Cheap — roughly £1.4 per kg, as a band midpoint rather than a price.
Key nutrients
- Vitamin C
- Vitamin K
- Anthocyanins
- Fiber
- Glucosinolates
Nutrition per 100g
- Calories: 30.6
- Protein: 2.2g
- Carbohydrate: 3.2g
- of which sugars: 3.2g
- Fat: 0.3g
- of which saturated: 0g
- Fibre: 3.1g
- Sodium: 16mg
Food vs. supplement
Whole red cabbage supplies vitamin C, vitamin K, fiber, and anthocyanin antioxidants together, an intact-food combination that isolated vitamin or antioxidant supplements do not reproduce.
Kitchen tip
Add a splash of vinegar, lemon juice, or a chopped apple when cooking red cabbage — the acidity keeps its anthocyanin pigments red-purple instead of shifting blue-gray, and eating some of it raw in slaws preserves more of its heat-sensitive vitamin C.
Common myth
"If red cabbage turns blue or greenish while cooking, it has gone bad or become unsafe to eat." In reality: This is a harmless, well-documented pH reaction, not spoilage: red cabbage's anthocyanin pigments are red-pink in acidic conditions, purple near neutral, and shift toward blue-green under alkaline conditions such as hard tap water or added baking soda — adding an acid like vinegar restores the red-purple color, and the cabbage remains safe to eat throughout.
Recipes that use it
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