Association of blood antioxidants and vitamins with risk of age-related cataract: a meta-analysis of observational studies

Am J Clin Nutr. 2013 Sep;98(3):778-86. doi: 10.3945/ajcn.112.053835. Epub 2013 Jul 10.

Abstract

Background: Observational studies have been inconsistent regarding the association between blood antioxidants or vitamins and risk of age-related cataract.

Objective: We performed a meta-analysis to determine whether an association exists between blood levels of antioxidants or vitamins and age-related cataract in observational studies.

Design: We searched PubMed, EMBASE, and the Web of Science for relevant studies from inception to October 2012. Study-specific risk estimates were combined by using a random-effects model.

Results: A total of 13 studies with 18,999 participants were involved in this meta-analysis. A pooled estimate showed vitamin E (OR: 0.75; 95% CI: 0.58, 0.96), α-carotene (OR: 0.72; 95% CI: 0.59, 0.88), lutein (OR: 0.75; 95% CI: 0.65, 0.87), and zeaxanthin (OR: 0.70; 95% CI: 0.60, 0.82) were inversely associated with age-related cataract. Vitamins A (OR: 0.69; 95% CI: 0.58, 0.83) and C (OR: 0.67; 95% CI: 0.57, 0.78) were inversely associated with age-related cataract in Asian populations but not in Western populations. β-Carotene (OR: 0.90; 95% CI: 0.78, 1.05), lycopene (OR: 0.86; 95% CI: 0.65, 1.15), and β-cryptoxanthin (OR: 0.83; 95% CI: 0.68, 1.02) had no significant association with risk of cataract.

Conclusions: This meta-analysis provides additional evidence supporting the view that blood levels of certain antioxidants are inversely associated with risk of age-related cataract. However, the role of antioxidant or vitamin supplement intake in preventing cataract should be further investigated in interventional studies.

Publication types

  • Meta-Analysis

MeSH terms

  • Antioxidants / metabolism*
  • Asian Continental Ancestry Group
  • Carotenoids / blood*
  • Cataract* / blood
  • Cataract* / etiology
  • Cataract* / prevention & control
  • Humans
  • Lutein / blood
  • Risk Factors
  • Vitamin A / blood*
  • Vitamin E / blood*
  • Vitamins / blood*
  • Xanthophylls / blood
  • Zeaxanthins

Substances

  • Antioxidants
  • Vitamins
  • Xanthophylls
  • Zeaxanthins
  • Vitamin A
  • Vitamin E
  • Carotenoids
  • alpha-carotene
  • Lutein