Lutein

Lutein, a chemical found in green vegetables, is a member of a family of substances known as carotenoids.Beta-carotene is the most famous nutrient in this class. Like beta-carotene, lutein is an antioxidant that protects our cells against damage caused by dangerous, naturally occurring chemicals known as free radicals. Recent evidence has found that lutein may play an important role in protecting our eyes and eyesight. It may work in two ways: by acting directly as a kind of natural sunblock, and also by neutralizing free radicals that can damage the eye.

Lutein is not an essential nutrient.However, it may be very important for optimal health. Were learning more all the time about nutrients like lutein that aren't required for life, but protect us in various ways. At present, an intake of about 6 mg daily of lutein is considered adequate. Green vegetables are the best source of lutein, especially spinach, kale, collard greens, romaine lettuce, leeks, and peas. Unlike beta-carotene, lutein is not found in high concentrations in yellow and orange vegetables such as carrots.

We dont know how much lutein is necessary for a therapeutic effect, but estimates range from 5 to 30 mg daily.

Evidence suggests that people who eat foods containing lutein are less likely to develop cataracts and perhaps macular degeneration as well, the two most common causes of vision loss in adults. However, these were observational studies, in which people simply eat what they please and researchers follow them to see what illnesses they develop. Because lutein is found in vegetables that may also contain other helpful substances, we dont know for sure if it is the lutein itself that is providing the benefit. We really need studies in which some people are given pure lutein and others placebo, but as yet they have not been performed. However, there are reasons to believe that lutein may indeed play an important role in protecting the eyes. Lutein is the main pigment (coloring chemical) in the center of the retina, the region of maximum visual sensitivity known as the macula. Macular degeneration consists of injury to the macula and leads to a severe loss in vision. One of the main causes of macular degeneration appears to be sun damage to the sensitive tissue. Lutein appears to act as a natural eyeshade, protecting the retina against too much light. However, one observational study found little beneft with lutein. Besides protecting the macula, lutein may also shield the lens of the eye from light damage, slowing down the development of cataracts. Furthermore, lutein fights free radicals. These chemicals can also damage the retina and the lens. Note: Lutein may help prevent macular degeneration, but it has not been proven to treat the condition once it has developed. If you already have macular degeneration, medical supervision is essential. Lutein might also help prevent atherosclerosis.

Although lutein is a normal part of the diet, there has not been a formal evaluation of lutein's safety when taken as a concentrated supplement. Maximum safe dosages for young children, pregnant or nursing women, or those with severe liver or kidney disease have not been established.