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Dietary antioxidant capacity and risk of type 2 diabetes in the large prospective E3N-EPIC cohort.

Author(s) : Mancini FR., Affret A., Dow C., Balkau B., Bonnet F., Boutron-Ruault MC., Fagherazzi G.
Date : Feb, 2018
Source(s) : Diabetologia #61:2 p308-316
Adresse : Inserm U1018, Centre for Research in Epidemiology and Population Health (CESP) 'Health across Generations' Team, University Paris-Saclay, University Paris-Sud, Gustave Roussy, Espace Maurice Tubiana, 114 rue Edouard Vaillant, 94805, Villejuif Cedex, France.

AIMS/HYPOTHESIS
Recent evidence suggests that oxidative stress may contribute to the pathogenesis of type 2 diabetes. The diet, and especially fruit and vegetables, contains a variety of compounds with antioxidant activity, which may have cumulative/synergistic antioxidant effects. The total antioxidant capacity, an index derived from dietary intake, is a single estimate of antioxidant capacity from all dietary antioxidants. The main aim of this study was to investigate the relationship between total antioxidant capacity and risk of type 2 diabetes.

METHODS
Among 64,223 women (mean age 52 ± 7 years) from the French E3N-European Prospective Investigation into Cancer and Nutrition (EPIC) cohort, 1751 women had validated type 2 diabetes during 15 years of follow-up. The total antioxidant capacity was estimated with the ferric ion-reducing antioxidant power (FRAP) method. Adjusted Cox proportional hazards regression models were used to calculate HRs and 95% CIs for the associations between total antioxidant capacity and type 2 diabetes risk, adjusted for potential confounders.

RESULTS
In multivariable models, higher levels of total antioxidant capacity were associated with a lower risk of type 2 diabetes. Compared with women in the lowest quintile, women in the third, fourth and fifth quintiles for total antioxidant capacity had HRs of 0.74 (95% CI 0.63, 0.86), 0.70 (95% CI 0.59, 0.83) and 0.73 (95% CI 0.60, 0.89), respectively. The inverse association between total antioxidant capacity and risk of type 2 diabetes was linear up to values of 15 mmol/day, after which the effect reached a plateau.

CONCLUSIONS/INTERPRETATION
Our findings suggest that the total antioxidant capacity may play an important role in reducing the risk of type 2 diabetes in middle-aged women. More studies are warranted to better understand the biological mechanisms underlying this inverse association.

Source : Pubmed

 

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