Antioxidant and Immunity

Definition

Compounds that neutralize reactive oxygen species, protecting cells from oxidative damage and supporting immune cell function and longevity.

How it works

Antioxidants are molecules that donate electrons to neutralize reactive oxygen species (ROS), which are unstable molecules produced during immune responses and cellular metabolism. While some ROS production is essential for immune function (helping to kill pathogens), excessive oxidative stress damages immune cells and perpetuates inflammation. Antioxidants, including vitamins C and E, selenium, polyphenols, and carotenoids, protect immune cells' DNA and proteins from oxidative damage, preserving their function and extending their lifespan. Inadequate antioxidant status impairs immune responses and accelerates tissue aging. Plant-based foods are exceptionally rich in diverse antioxidants; a diet rich in colorful vegetables and fruits provides superior antioxidant protection compared to isolated supplement approaches.

Role

Neutralize damaging reactive oxygen species, protecting immune cell function and preventing chronic inflammation.

Examples

• Vitamin C in citrus and peppers
• Vitamin E in nuts and seeds
• Polyphenols in berries and tea
• Carotenoids in carrots and leafy greens
• Selenium in seafood

Recommendations

Emphasize color diversity in plant foods, targeting at least five different colored vegetables and fruits daily. Include antioxidant-rich beverages like green tea and limit processed foods that increase oxidative stress. Consider whole-food antioxidant sources rather than isolated supplements.

Key takeaway

A diverse intake of antioxidant-rich whole foods is the most effective strategy for protecting immune cells and preventing inflammation.

Related terms