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The Age-Related Eye Disease Study (AREDS) was a clinical trial sponsored by the National Eye Institute that ran from 1992 to 2001. [1] The study was designed to: investigate the natural history and risk factors of age-related macular degeneration (AMD) and cataracts, and
Lutein (/ ˈ lj uː t i ɪ n,-t iː n /; [2] from Latin luteus meaning "yellow") is a xanthophyll and one of 600 known naturally occurring carotenoids. Lutein is synthesized only by plants, and like other xanthophylls is found in high quantities in green leafy vegetables such as spinach , kale and yellow carrots .
In plants, the xanthophyll lutein is the most abundant carotenoid and its role in preventing age-related eye disease is currently under investigation. [5] Lutein and the other carotenoid pigments found in mature leaves are often not obvious because of the masking presence of chlorophyll. When chlorophyll is not present, as in autumn foliage ...
The pigments of the erect tagetes are due to the presence of carotenoids, of which the main one is lutein, which is associated with the prevention of the development of age-related eye diseases such as cataracts and macular degeneration. The most intense orange tones of the flowers are related to a higher content of carotenoids, especially ...
The group of xanthophylls includes (among many other compounds) lutein, zeaxanthin, neoxanthin, violaxanthin, flavoxanthin, and α- and β-cryptoxanthin. The latter compound is the only known xanthophyll to contain a beta-ionone ring, and thus β- cryptoxanthin is the only xanthophyll that is known to possess pro-vitamin A activity for mammals.
The specific vitamins and minerals in AREDS-1 are vitamin C (500 mg), zinc (80 mg), vitamin E (400 IU), copper (2 mg) and beta-carotene (15 mg). In the AREDS-2 formulation, lutein (10 mg) and zeaxanthin (2 mg) replaced beta-carotene due to the risk of lung cancer in smokers taking beta-carotene. [ 2 ]
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