Dietary total antioxidant capacity and its association with renal function and kidney stones: Results of a RaNCD cohort study. Issue 5 (19th April 2022)

• Record Type: Journal Article
• Authors: Moludi, Jalal; Tandorost, Arash; Kamari, Negin; Abdollahzad, Hadi; Pakzad, Reza; Najafi, Farid; Pasdar, Yahya
• Is Part Of: Food science & nutrition. Volume 10:Issue 5(2022)
• Page Start: 1442
• Page End: 1450
• Publication Date: 2022-04-19
• Subjects: chronic kidney disease -- dietary total antioxidant capacity -- kidney stones -- RaNCD cohort -- renal; Food industry and trade -- Periodicals; Food -- Periodicals; Nutrition -- Periodicals; 664
• DOI: 10.1002/fsn3.2753
• Languages: English
• ISSNs: 2048-7177

Abstract

Abstract: There is evidence to support the hypothesis that dietary antioxidants have shown protective effects against chronic kidney disease (CKD). The purpose of this study was to determine the association between the dietary total antioxidant capacity (DTAC), renal function, and development of CKD and kidney stones in Ravansar Non‐Communicable Diseases (RaNCD) cohort study, Kermanshah, Iran. This cross‐sectional study was conducted using the recruitment baseline data of the RaNCD cohort study on 9, 777 individuals aged 35–65 years. Food frequency questionnaire (FFQ) was performed to assess diet. DTAC scores were calculated using the ferric reducing antioxidant power (FRAP) of selected foods. Renal function was assessed by the estimated glomerular filtration rate (eGFR), blood urea nitrogen, and serum creatinine concentration. Prevalent CKD was based on an eGFR less than <60 ml/min per 1.73 m 2 . Incidence of kidney stones was also assessed by self‐reporting. Out of 9, 777 participants, 1, 747 subjects (eGFR: 18.50 ml/min per 1.73 m 2 ; 95% confidence interval (CI): 17.72–19.30) had CKD. The mean DTAC score in this study was 0.24 ± 0.16 µmol TE/100 g (micromole of Trolox Equivalents). We showed a significant trend for eGFR across quartiles of DTAC, i.e., participants in the fourth quartile had a higher glomerular filtration rate (GFR) than those in the first one (DTAC Q4 vs Q1 = 82.20 versus 72.20 ml/min per 1.73 m 2, p < .001). Another finding is that high DTAC scores were not associated with having kidney stones after adjusting for confounders. We revealed that higher DTAC scores have positive effects on the renal function. Interestingly, our findings showed that a high DTAC score had nonsignificant correlation with odds of kidney stones. Abstract : To our knowledge, this is the first study designed to evaluate the relations between the dietary total antioxidant capacity (DTAC) and renal function and kidney stones in a large general population. Interestingly, we found an inverse and strong association between the renal function and DTAC, although we did not find a statistical significance for kidney stones and DTAC.