Cataract : Supplements

A naturopathic doctor or a nutritionist may recommend the following dietary changes: Reduce consumption of salty or fatty foods. Diabetics should also limit their intake of milk and other dairy products. Increase intake of foods that are high in b...

Lutein and zeaxanthin are found in high levels in foods such as green vegetables, egg yolk, kiwi fruit, grapes, orange juice, zucchini, squash, and corn. For some commercially available supplements, lutein is extracted from marigold petals. Lutein and zeaxanthin are carotenoids in the macular region of the retina of the eye (macular pigment), and thus lutein has been studied for its use in treating cataracts, preventing macular degeneration and retinal degeneration. Lutein and zeaxanthin also have antioxidant capabilities as well as the ability to trap short-wavelength light. The potential for carotenoids, including lutein, to play a preventing role in cardiovascular disease and cancer was recognized in the 1990s. Most of the information surrounding lutein is based on blood and/or dietary intakes of lutein compared with disease states (e.g. cancer, eye disorders, lung function, muscle soreness, obesity, and pre-eclampsia). More evidence is needed before recommendations can be made in these fields.

Found in certain fruits and vegetables as well as egg yolks, lutein is a nutrient with a number of potentially beneficial effects. It is a member of the carotenoid family, a group of chemicals related to vitamin A . While betacarotene, the precursor of vitamin A, may be the most familiar carotenoid, there are almost 600 others whose effects have yet to be extensively studied. Aside from lutein, these include alpha-carotene, lycopene , zeaxanthin, and beta-cryptoxanthin. In the plant world, carotenoids like lutein help to give color to sweet potatoes, carrots, and other fruits and vegetables. In people, lutein and zeaxanthin make up most of the pigment in the center of the retina, where vision sensitivity is greatest. While lutein is not considered an essential nutrient, studies suggest that it may play an important role in maintaining healthy vision and preventing eye diseases such as age-related macular degeneration (ARMD) and cataracts . Getting adequate amounts of this carotenoid may also decrease the risk of developing colon cancer and heart disease . Lutein and other carotenoids are considered important because of their antioxidant properties. Antioxidants help to protect cells from damage caused by free radicals, the destructive fragments of oxygen produced as a byproduct during normal metabolic processes. As free radicals travel through the body, they cause damage to cells and genes by stealing electrons from other molecules—a process referred to as oxidation. Test tube studies conducted by the Agricultural Research Service of the United States Department of Agriculture (USDA) suggest that lutein may be just as effective at combating free radicals as vitamin E , which is a potent antioxidant. Concentrated mainly in the lens and retina of the eye, lutein may help to protect vision by neutralizing free radicals and by increasing the density of eye pigment. Lutein may also shield the eyes from the destructive effects of sunlight. In late 2001, a British study reported that risk of cortical cataract was lowest with high concentrations of lutein.