What are Antioxidants?

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What are Antioxidants?

Antioxidants are substances or nutrients in our foods which can prevent or slow the oxidative damage to our body. When our body cells use oxygen, they naturally produce free radicals (by-products) which can cause damage. Antioxidants act as “free radical scavengers” and hence prevent and repair damage done by these free radicals.  Health problems such as heart disease, macular degeneration, diabetes, cancer etc are all contributed by oxidative damage. Indeed, a recent study conducted by researchers from London found that 5 servings of fruits and vegetables reduce the risk of stroke by 25 percent. Antioxidants may also enhance immune defense and therefore lower the risk of cancer and infection.

Most Commonly Known Antioxidants

Vitamin A and Carotenoids

Carrots, squash, broccoli, sweet potatoes, tomatoes, kale, collards, cantaloupe, peaches and apricots (bright-colored fruits and vegetables!)

Vitamin C

Citrus fruits like oranges and lime etc, green peppers, broccoli, green leafy vegetables, strawberries and tomatoes

Vitamin E

Nuts & seeds, whole grains, green leafy vegetables, vegetable oil and liver oil

Selenium

Fish & shellfish, red meat, grains, eggs, chicken and garlic

Other Common Antioxidants

Some common phytochemicals

  • Flavonoids / polyphenols
    • soy
    • red wine
    • purple grapes or Concord grapes
    • pomegranate
    • cranberries
    • tea
  • Lycopene
    • Tomato and tomato products
    • pink grapefruit
    • watermelon
  • Lutein
    • dark green vegetables such as kale, broccoli, kiwi, brussels sprout and spinach
  • Lignan
    • flax seed
    • oatmeal
    • barley
    • rye

Vitamin-like Antioxidants:

  • Coenzyme Q10 (CoQ10)
  • Glutathione

Antioxidant enzymes made by the body:

  • superoxide dismutase (SOD)
  • catalase
  • glutathione peroxidase

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