Leek

Finely sliced or chopped raw leek as salad ingredient, topping or seasoning. The mild onion-like flavour is far more pleasant than raw onion — almost no pungency. Raw consumption preserves more heat-sensitive vitamin C and folate. Small amounts are well tolerated by most people; larger quantities may cause bloating in sensitive individuals due to fructan content.

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Sweated or boiled leek as a mild, versatile vegetable in soups, stews and gratins — a classic winter vegetable of European cooking since antiquity.

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Folk use of leek as a mild digestive and intestinal remedy. Leek is considered a gentler, more digestible allium than onion or garlic — traditionally recommended for mild sluggish digestion, bloating and as an intestinal cleanser after heavy meals. The fructans (inulin-type) present act as prebiotic dietary fibre promoting Bifidobacterium and Lactobacillus in the colon. Confirmed as a fibre source scientifically; clinical studies on GI effects are lacking.

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Traditional folk remedy: leek soup or hot leek broth for colds, coughs and sore throats. Following the tradition of sulfur-rich alliums (onion, garlic), leek is used in folk medicine as a warming and expectorant remedy for upper respiratory catarrhs. The organosulfides present have shown antimicrobial and mucolytic properties in vitro; direct clinical evidence for leek soup as a cold therapy does not exist. Benefit is likely multifactorial: warmth, fluid intake, mucus dilution, general comfort effect.

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Leek contains flavonoids (esp. kaempferol) and organosulfides that show antioxidant and mildly hypotensive properties in vitro. In folk medicine leek is considered, like onion and garlic, a 'heart and vessel vegetable'. Epidemiological studies associate high allium intake (leek, onion, garlic) with lower cardiovascular risk; isolated clinical data for leek alone are lacking. Recommended as part of a vegetable-rich diet.

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Leek as an important vitamin K1 source (especially the dark-green leaves supply ~47 µg/100 g raw). Vitamin K1 is essential for blood coagulation and bone health. Leek also contains notable amounts of folate (ca. 16–64 µg/100 g depending on part), vitamin C (ca. 12 mg/100 g) and manganese. The traditional inclusion of leek in winter diet in northern Europe provided important micronutrients in seasons without fresh vegetables.

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Folk medicinal use of fresh leek juice or finely chopped leek as a mild diuretic and to support kidney function — analogous to the traditional diuretic use of onion and garlic. Scientific evidence for a significant diuretic effect of leek in humans is lacking. High water content (~83 %) and potassium content (~180 mg/100 g) are nutritionally plausible.

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