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Some of the most well-known antioxidants include beta-carotene, lutein, selenium, lycopene, and vitamins A, C, and E. Basically; all antioxidants protect our bodies from free radicals. Free radicals are produced in our bodies as they break down foods, but they are also caused by environmental factors, such as smoking and exposure to radiation. Too many free radicals can cause everything from cancer to heart disease.
Luckily, antioxidants are found in a variety of foods, from tomatoes to many oils like flaxseed oil. They are also available as supplements, if you don't get enough in your diet. Eating a balanced diet made up of fruits and vegetables, nuts, grains, fish and poultry is the best way to ensure you get enough antioxidants to keep your immune system healthy and free of disease.