Leeks are rich in flavonoids, especially kaempferol. Flavonoids are antioxidants and may have anti-inflammatory, anti-diabetic, and anticancer properties. Leeks are also rich in Vitamin K, which helps reduce the risk of osteoporosis. The lutein and zeaxanthin in leeks help protect the eyes, reducing the risk of cataracts and age-related macular degeneration. Leeks are low in calories and high in fiber, aiding in weight management.