Association between Dietary Acid Load and Insulin Resistance: Tehran Lipid and Glucose Study
2016
Moghadam, S.K., Shahid Beheshti University of Medical Sciences, Tehran, Iran | Bahadoran, Z., Shahid Beheshti University of Medical Sciences, Tehran, Iran | Mirmiran, P., Shahid Beheshti University of Medical Sciences, Tehran, Iran | Tohidi, M., Shahid Beheshti University of Medical Sciences, Tehran, Iran | Azizi, F., Shahid Beheshti University of Medical Sciences, Tehran, Iran
In the current study, we investigated the longitudinal association between dietary acid load and the risk of insulin resistance (IR) in the Tehranian adult population. This longitudinal study was conducted on 925 participants, aged 22∼80 years old, in the framework of the third (2006∼2008) and fourth (2009∼2011) phases of the Tehran Lipid and Glucose Study. At baseline, the dietary intake of subjects was assessed using a validated semi-quantitative food frequency questionnaire, and the potential renal acid load (PRAL) and net endogenous acid production (NEAP) scores were calculated at baseline. Fasting serum insulin and glucose were measured at baseline and again after a 3-year of follow-up; IR was defined according to optimal cut-off values. Multiple logistic regression models were used to estimate the risk of IR according to the PRAL and NEAP quartile categories. Mean age and body mass index of the participants were 40.3 years old of 26.4 kg/m2, respectively. Mean PRAL and NEAP scores were −11.2 and 35.6 mEq/d, respectively. After adjustment for potential confounders, compared to the lowest quartile of PRAL and NEAP, the highest quartile was accompanied with increased risk of IR [odds ratio (OR)=2.81, 95% confidence interval (CI)=1.32∼5.97 and OR=2.18, 95% CI=1.03 ∼4.61, respectively]. Our findings suggest that higher acidic dietary acid-base load, defined by higher PRAL and NEAP scores, may be a risk factor for the development of IR and related metabolic disorders.
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