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Carotenoids are oil-soluble plant pigments that the body can convert to vitamin A. They are responsible for the bright colors of produce. The best known carotenoid is beta-carotene. Beta carotene also has the most vitamin A activity of all of the carotenoids.  Other carotenoids include alpha carotene, lycopene, lutein, astaxanthin, beta crpytoxanthin, and zeaxanthin.

Until recently the only value seen in carotenoids was their ability to be converted to vitamin A. Carotenoids also act as antioxidants, protecting the cells of your body. Much research has been done that shows that they enhance the immune system and protect against cancer. They also enhance communication between the cells, which may prevent the overgrowth of cells (and possibly inhibit cancer), according to research.

Beta carotene and alpha carotene and beta cryptoxanthin are found in orange colored fruits and vegetables like carrots, squash, sweet potatoes, yams, apricots and mangoes. Dark green vegetables are also good sources of carotenoids; they contain beta carotene and lutein. Tomatoes contain lycopene, which is also found in pink grapefruit and guava.

Because of the many health benefits of carotenoids, eating plenty of brightly colored produce is a good idea. Including these foods in your diet combats aging, enhances the immune system and helps protect against cancer.