Journal
AMERICAN JOURNAL OF CLINICAL NUTRITION
Volume 86, Issue 4, Pages 1210-1218Publisher
OXFORD UNIV PRESS
DOI: 10.1093/ajcn/86.4.1210
Keywords
retina; nutrition; carbohydrate; diabetes; sugar; glycation; inflammation; aging; stress; epidemiology
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Funding
- NEI NIH HHS [R03-EY014183-01A2] Funding Source: Medline
- PHS HHS [R01-13250] Funding Source: Medline
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Background: Cross-sectional studies indicate that diets that provide a higher dietary glycemic index (dGI) are associated with a greater risk of age-related macular degeneration (AMD). No prospective studies have addressed this issue. Objective: The objective was to prospectively evaluate the effect of baseline dGI on the progression of AMD. Design: dGI was calculated as the weighted average of GIs from foods and was evaluated as being above or below the sex median (women: 77.9; men: 79.3) for 3977 participants aged 55-80 y (58% women) in the Age-Related Eye Disease Study. The 7232 eligible eyes without advanced AMD were classified into I of 3 AMD categories: group 1 (nonextensive small drusen), group 2 (intermediate drusen. extensive small drusen, or pigmentary abnormalities), or Group 3 (large drusen or extensive intermediate drusen). With the use of multifailure Cox proportional-hazards regression, we modeled the time to the maximal progression to evaluate the relation between dGI and the risk of AMD. Results: Overall, the multivariate-adjusted risk of progression over 8 y of follow-up ((x) over bar: 5.4 y) was significantly higher (risk ratio: 1.10; 95% CI: 1.00, 1.20; P = 0.047) in the high-dGI group than in the low-dGI group. The risk of progression for groups 1, 2, and 3 eyes was 5%, 8%, and 17% greater, respectively (P for trend < 0.001). The latter gives an estimate that 7.8% of new advanced AMD cases would be prevented in 5 y if people consumed the low-dGI diet. Conclusion: Persons at risk of AMD progression, especially those at high risk of advanced AMD, may benefit from consuming a smaller amount of refined carbohydrates.
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