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http://dx.doi.org/10.4163/jnh.2020.53.3.231

Traditional Korean diet can alter the urine organic acid profile, which may reflect the metabolic influence of the diet  

Shin, Phil-Kyung (CHA University)
Chun, Sukyung (CHA University)
Kim, Myung Sunny (Korea Food Research Institute)
Park, Seon-Joo (Department of Food and Nutrition, College of BioNano Technology, Gachon University)
Kim, Min Jung (Korea Food Research Institute)
Kwon, Dae Young (Korea Food Research Institute)
Kim, KyongChol (GangNam Major Hospital)
Lee, Hae-Jeung (Department of Food and Nutrition, College of BioNano Technology, Gachon University)
Choi, Sang-Woon (CHA University)
Publication Information
Journal of Nutrition and Health / v.53, no.3, 2020 , pp. 231-243 More about this Journal
Abstract
Purpose: To determine the metabolic influence of the traditional Korean diet (K-diet), which has been regarded as a healthy diet, we investigated the profile of urine organic acids that are intermediates of various types of metabolism including energy metabolism. Methods: Ten women aged 50-60 years were recruited and randomly divided into 2 diet groups, K-diet and control diet, the latter of which is a Westernized Korean diet that is commonly consumed by Koreans nowadays. Before and after the 2-week intervention, 46 urine organic acids were determined using LC/MS/MS, along with clinical parameters. Results: The average concentrations of succinate (4.14 ± 0.84 ㎍/mg creatinine vs. 1.49 ± 0.11, p = 0.0346) and hydroxymethylglutarate (3.67 ± 0.36 ㎍/mg creatinine vs. 2.97 ± 0.29, p = 0.0466), both of which are intermediates of energy metabolism, decreased in the K-diet group after the 2-week intervention, but these were not observed in the control diet group. In particular, the average concentration of succinate in the K-diet group was lower than that in the control group (3.33 ± 0.56 ㎍/mg creatinine vs. 1.49 ± 0.11, p = 0.0284) after 2 weeks. The concentrations of two tryptophan metabolites, 5-hydroxyindolacetate (3.72 ± 0.22 ㎍/mg creatinine vs. 3.14 ± 0.21, p = 0.0183) and indican (76.99 ± 8.35 ㎍/mg creatinine vs. 37.89 ± 10.06, p = 0.0205) also decreased only in the K-diet group. After the 2-week intervention, the concentration of kynurenate, another tryptophan metabolite, was lower in the K-diet group than that in the control diet group (3.96 ± 0.51 ㎍/mg creatinine vs. 2.90 ± 0.22, p = 0.0356). Interestingly, the urine level of kynurenate was positively correlated with BMI (r = 0.61424, p = 0.0003) and total cholesterol (r = 0.46979, p = 0.0088), which decreased only in the K-diet group (239.40 ± 15.14 mg/dL vs. 198.20 ± 13.25, p = 0.0163). Conclusion: The K-diet alters the urinary excretion of organic acids involved in energy metabolism and tryptophan metabolism, suggesting the influence of the K-diet on these types of metabolism. Urine organic acids changed by the K-diet may serve as biomarkers in future studies.
Keywords
Korean diet; urine organic acid; succinate; hydroxymethylglutarate; kynurenate;
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