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European Journal of Nutrition

, Volume 46, Issue 2, pp 118–124 | Cite as

Prospective study showing that dietary vitamin C reduced the risk of age-related cataracts in a middle-aged Japanese population

  • Masao Yoshida
  • Yutaka Takashima
  • Manami Inoue
  • Motoki Iwasaki
  • Tetsuya Otani
  • Satoshi Sasaki
  • Shoichiro TsuganeEmail author
  • for the JPHC Study Group
ORIGINAL CONTRIBUTION

Abstract

Background

In Western countries, many epidemiological studies have demonstrated that specific dietary nutrients are associated with the risk of developing age-related cataracts. These reports have suggested that dietary antioxidant vitamins, in particular vitamin C, can play a role in preventing the onset or progression of age-related visual impairment. However, few prospective studies have examined this relationship in a general Asian population. Therefore, in this study, we investigated whether dietary vitamin C was associated with a lower incidence of age-related cataracts by performing a 5-year prospective population-based analysis using data from a cohort of over 30,000 Japanese residents recruited to the Japan Public Health Center-based Prospective Study (JPHC Study) cohort I.

Aim of the study

We carried out a prospective analysis of the association between vitamin C intake and age-related cataracts among middle-aged Japanese, to study the effects of dietary antioxidants in an Asian population.

Methods

This 5-year population-based study included 16,415 men and 18,771 women (aged 45–64 years), who were recruited onto the JPHC Study and had not reported cataracts in baseline surveys. Vitamin C was calculated from the nutrient intake assessed by self-administered food-frequency questionnaires (FFQ). Self-reported questionnaires were used to assess two endpoints: diagnosis or extraction of cataracts.

Results

At follow-up, 216 men and 551 women reported new diagnoses, and 110 men and 187 women reported extractions of cataracts. For both endpoints, a higher vitamin C intake was associated with a reduced incidence of cataracts in both sexes. After adjusting for potential confounding factors, the multivariate odds ratios (ORs) for men and women in the highest quintiles of energy-adjusted vitamin C intake, relative to the lowest quintiles, were 0.65 (95% CI, 0.42–0.97) and 0.59 (95% CI, 0.43–0.89) for cataract diagnoses, and 0.70 (95% CI, 0.44–1.20) and 0.64 (95% CI, 0.41–0.94) for cataract extractions, respectively.

Conclusions

Dietary vitamin C intake might lower the risk of age-related cataracts among middle-aged Japanese.

Keywords

cataract cataract extraction antioxidants vitamin C prospective studies 

Notes

Acknowledgments

This study was supported by Grants-in-Aid for Cancer Research and for the Third Term Comprehensive Ten-Year Strategy for Cancer Control from the Ministry of Health, Labor and Welfare of Japan. The authors thank all staff members in each study area for their efforts with baseline and follow-up surveys.

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Copyright information

© Steinkopff Verlag Darmstadt 2007

Authors and Affiliations

  • Masao Yoshida
    • 1
  • Yutaka Takashima
    • 1
  • Manami Inoue
    • 2
  • Motoki Iwasaki
    • 2
  • Tetsuya Otani
    • 2
  • Satoshi Sasaki
    • 3
  • Shoichiro Tsugane
    • 2
    Email author
  • for the JPHC Study Group
  1. 1.Dept. of Public HealthKyorin University School of MedicineTokyoJapan
  2. 2.Epidemiology and Preventive DivisionResearch Center for Cancer Prevention and Screening, National Cancer CenterTokyoJapan
  3. 3.National Institute of Health and NutritionTokyoJapan

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