Health Benefits of Leeks

Onions and garlic are mainstays of most kitchens, but many cooks have never touched a leek. Like their better-known cousins, leeks belong to the allium family. Leeks look like giant green onions and can stand in for onions in many dishes. 

The early Greeks and Romans were fond of leeks, thinking they were good for the voice. 

Health Benefits

Leeks are rich in flavonoids, especially one called kaempferol. Flavonoids are antioxidants and may have anti-inflammatory, anti-diabetic, and anticancer properties, as well as other health benefits. Definite proof of these health benefits of leeks will depend upon future studies with humans. 

Other health benefits of leeks include:  

Cancer Risk Reduction

Plants of the allium family may have a connection with a lower risk of certain cancers. Cancers of the prostate, stomach, colon, and esophagus are rarer in those who consume a lot of garlic, shallots, chives, onions, and leeks. Researchers think that the antioxidants in allium vegetables repair damaged DNA. Many studies have found evidence for a reduced risk of colorectal cancer. One analysis of 16 studies found that all vegetables in the allium family offer these health benefits.    

Strong Bones

Leeks are rich in Vitamin K, which may reduce the risk of osteoporosis. Some studies show a relationship between a higher intake of Vitamin K and denser bones, which lead to a reduced risk of hip fractures. In some parts of the world, health authorities have approved the use of Vitamin K for osteoporosis. The Food and Drug Administration has not endorsed it in the United States. 

Healthy Eyes

Leeks contain lutein and zeaxanthin, two substances that protect the eyes. These substances, known as carotenoids, reduce the risk of cataracts and age-related macular degeneration. These two eye conditions can severely impair vision and negatively impact quality of life. They are common in older people.

Weight Management

Because leeks are a low-calorie food, they can be part of a weight management program. The water and fiber in leeks can give you a feeling of fullness, so you are less likely to overeat. Leeks also add a lot of flavor to foods and make eating healthy dishes enjoyable.    

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Nutrition

Besides Vitamin K, leeks also contain: 

Nutrients per Serving

Leeks are low in calories, high in fiber, and have zero fat. A one-cup serving contains approximately:

  • Calories: 54
  • Protein: 1 gram
  • Fat: 0 grams
  • Carbohydrates: 13 grams
  • Fiber: 2 grams
  • Sugar: 4 grams

Tips for Cleaning Leeks

Farmers grow leeks in trenches that they fill with dirt as the plant matures. This practice keeps the bulb white, but it also causes dirt to collect between the layers of the plant. As a result, you must clean leeks carefully to avoid getting dirt in your food. One method is to cut off the root, slice the leek vertically, and hold it under running water.   

How to Use Leeks

Enjoy leeks cooked or raw. Here are some ways to use them:

  • Thinly slice and use raw as a salad topping.
  • Add to mixed vegetables before oven roasting.
  • Make mashed potatoes more interesting by adding leeks to boiling potatoes, then mashing them with the potatoes.
  • Try vichyssoise, a traditional potato-and-leek soup served cold. 
  • Use leeks to season beans, soups, and stews.  
  • Combine leeks with fennel for a unique flavor blend.
  • Serve sautéed leeks over salmon.
WebMD Medical Reference Reviewed by Brunilda Nazario, MD on September 16, 2020

Sources

SOURCES: 

BBC: "The leek, national symbol of Wales."

Food and Nutrition: "Leeks: This Onion Cousin Delivers Unique Textures and Delicate Flavors."

Journal of Nutritional Science: "Flavonoids: an overview."

Molecular Nutrition and Food Research: Colorectal cancer and adenomatous polyps in relation to allium vegetables intake: a meta-analysis of observational studies."

National Institutes of Health: "Vitamin K."

Nutrients: "Dietary Sources of Lutein and Zeaxanthin Carotenoids and Their Role in Eye Health."

USDA SNAP-Ed Connection: "Leeks."

The World's Healthiest Foods: "Leeks."

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