Simply put, lutein is an antioxidant that appears to quench or reduce harmful free radicals in various parts of the body. Free radicals can play a role in a variety of chronic diseases.
Because the body is unable to naturally manufacture lutein, humans rely on their consumption of lutein rich foods or lutein supplements to maintain optimal levels of lutein.
The major dietary sources of lutein in are spinach, broccoli, tomatoes, oranges and orange juice, carrots, celery, and greens. Data suggest that incorporating these foods into the diet may help reduce the risk of developing colon cancer.
Your body does not make lutein the way it makes other nutrients. It can only be obtained from the foods you eat.
Studies have shown that the amount of lutein in the macula can be changed based on the level of lutein supplied in the diet. Dark-green leafy vegetables like spinach and kale are some of the highest lutein-containing foods. Foods with smaller amounts of lutein include broccoli, corn, romaine lettuce, peas, zucchini, oranges and tangerines.
How much lutein do we need? Research suggests a minimum of 6 to 10 mg per day of lutein from dark green leafy vegetables and other sources is necessary to realize lutein's health benefits. Even if you eat a balanced diet, you'd need a large bowl of fresh spinach to get about 6 mg of lutein. Most Americans just don't consume enough foods rich in lutein.
Lutein is widely available in a variety of nutritional supplements and fortified foods and beverages for people wanting to supplement their dietary intake of lutein, making their diet even better for their eyes and skin.