Several studies have recently demonstrated that some nutrients may have a protective effect on the development and progression of cataract. This protective effect was observed for vitamin C, E and lutein and zeaxanthin (the only carotenoids found in the lens).
- The studies have shown that:
- people using supplements of vitamin C and E for more than ten years had decreased progression of nuclear cataracts
- higher levels of vitamin C in the diet were associated with a lower risk of cataracts
- Vitamin E supplement use for at least one year was associated with a lower risk of nuclear cataracts becoming more severe
- people who use multivitamins or any supplement containing vitamins C and E have a reduced risk for nuclear and cortical cataracts
- high amounts of lutein and zeaxanthin (6.9 mg per day) in the diet of people relate to a reduced need for cataract surgery
- People with the highest intakes of lutein + zeaxanthin had a significantly lower risk of developing cataracts than those with new lower consumption
Individuals consume daily about 100 mg of vitamin C, 1.7 mg of lutein and zeaxanthin and 8 mg of vitamin E (or 12 IU). But those studies have shown that the levels associated with the benefit are considerably higher than the average current consumption: Vitamin C 250 mg a day, vitamin E over 100 IU, and lutein and zeaxanthin more 6 mg.
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