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Dietary Acid Load and Risk of Type 2 Diabetes: A Systematic Review and Dose–Response Meta-Analysis of Prospective Observational Studies Publisher Pubmed



Jayedi A1 ; Shabbidar S1
Authors
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Authors Affiliations
  1. 1. Department of Community Nutrition, School of Nutritional Science and Dietetics, Tehran University of Medical Sciences, Tehran, Iran

Source: Clinical Nutrition ESPEN Published:2018


Abstract

Background & aims: Existing evidence suggests a link between acid-forming potential of diet and type 2 diabetes. But the degree of the associations and shape of the dose–response relations across different indices of diet-dependent acid load and risk of type 2 diabetes and potential confounding by sex have not been established. We aimed to test the dose–response association of different measures of dietary acid load and risk of incident type 2 diabetes, with considering the sex as a potential confounder. Methods: Systematic search was done using PubMed and Scopus, from inception up to September 2017. Prospective observational studies reporting the risk estimates of type 2 diabetes for three or more quantitative categories of potential renal acid load (PRAL), net endogenous acid production (NEAP) and animal protein-to-potassium ratio (A:P) scores were included. Pooled relative risks (RRs) were calculated using random effects models. Results: Seven prospective cohort studies with 319,542 participants and 17,986 incident cases of type 2 diabetes were included. Pooled RRs for a 5 unit increment in dietary PRAL, NEAP and A:P was 1.04 (95% CI: 1.01, 1.06; I2 = 79%, n = 7), 1.03 (95% CI: 1.01, 1.04; I2 = 54%, n = 7), and 1.11 (95% CI: 1.07, 1.15; I2 = 41%, n = 3), respectively. Subgroup analysis resulted in significant positive relationship only among women, compared with men. There was a linear association between NEAP and A:P scores and risk of type 2 diabetes, whereas the association appeared to be U-shaped in analysis of PRAL. Conclusions: Adherence to a diet with high acid-forming potential might increase the risk of type 2 diabetes. Shape of the dose–response relations across different indices of dietary acid load and potential sex differences in the associations need to be further explored. The interpretation of the results is limited by low number of studies. © 2017 European Society for Clinical Nutrition and Metabolism
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