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Development and Validation of Dietary and Lifestyle Insulinemic Indices Among Iranian Adult Population

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Publisher Biomed Central
Date 2022 Jan 11
PMID 35012588
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Abstract

Background: There is no study regarding developing a valid index to predict insulin-related disorders in the Iranian population based on their dietary habits and lifestyle. In the current study, we aimed to develop and validate insulinemic potential indices of diet and lifestyle in Iranian adults.

Methods: In this cross-sectional study, we analysed data of 1063 men and women aged ≥ 25 years among participants of the examination three of Tehran lipid and glucose study (TLGS) (2006-2008). Dietary intakes were assessed using a valid semi-quantitative food frequency questionnaire. Dietary and lifestyle indices were developed using stepwise linear regression analysis based on dietary intakes, body mass index, and physical activity data. Fasting serum insulin concentration and homeostatic model assessment for insulin resistance (HOMA-IR) were used as biomarkers of hyperinsulinemia (HI) and insulin resistance (IR). Validation analyses were performed in examination four of TLGS.

Results: We developed four indices related to insulin homeostasis, including the dietary index for HI (DIH), the dietary index for IR (DIR), the lifestyle index for HI (LIH), and the lifestyle index for IR (LIR). Based on multivariable-adjusted models, the relative values of the biomarker in subjects in the highest quartile of indices were 45% for LIH (95% CI 1.36-1.55, P < 0.001), 28% for DIR (95% CI 1.13-1.42, P = 0.019), and 51% for LIR (95% CI 1.41-1.61, P < 0.001), higher than those in the reference quartile, respectively.

Conclusion: We designed and validated indices to determine the insulin potential of diet and lifestyle for the Iranian population, according to Iran's demographic and dietary intake characteristics.

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