Korean Journal of Community Nutrition

Research Articles

[Korean]
Dietary Iron Intake of Koreans Estimated using 2 Different Sources of Iron Contents are Comparable: Food & Nutrient Database and Iron Contents of Cooked Foods in the Korean Total Diet Study: Jeeyeon Lee, Sung Ok Kwon, Yoonjae Yeoh, Min Jeong Seo, Gae Ho Lee, Cho-il Kim; Korean J Community Nutr 2022;27(3):245-253. Published online June 30, 2022; DOI: https://doi.org/10.5720/kjcn.2022.27.3.245

Objectives
This study was conducted to find out if the dietary iron intake of Koreans estimated by 2 different methods (iron content sources) using the food intake data from the Korea National Health and Nutrition Examination Survey (KNHANES) are comparable. One method was based on the KNHANES's Food & Nutrient Database (FND) derived mainly from the Korean Food Composition Table and the other used the iron content (IC) of food samples processed in the Korean Total Diet Study (KTDS).
Methods
Dietary intake data from the 2013-2016 KNHANES was used to select representative foods (RFs) in KTDS for iron analysis. Selection of the RFs and cooking methods for each RF (RF × cooking method pair) was performed according to the ‘Guidebook for Korean Total Diet Studies’ and resulted in a total of 132 RFs and 224 ‘RF × cooking method’ pairs. RFs were collected in 9 metropolitan cities nationwide once or twice (for those with seasonality) in 2018 and made into 6 composites each, based on the origin and season prior to cooking. Then, the RF composites prepared to a ‘table ready’ state for KTDS were analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). Dietary iron intake of the Korean population was estimated using only RFs’ intake data based on the 2 sources of iron content, namely FND-KNHANES and IC-KTDS.
Results
RFs in KTDS covered 92.0% of total food intake of Koreans in the 2016-2018 KNHANES. Mean iron intake of Koreans was 7.77 mg/person/day by IC-KTDS vs 9.73 mg/person/day by FND-KNHANES. The major food groups contributing to iron intake were meats (21.7%), vegetables (20.5%), and grains & cereals (13.4%) as per IC-KTDS. On the other hand, the latter source (FND-KNHANES) resulted in a very different profile: grains & cereals (31.1%), vegetables (16.8%), and meats (15.3%). While the top iron source was beef, accounting for 8.6% in the former, it was polished rice (19.2%) in the latter. There was a 10-fold difference in the iron content of polished rice between 2 sources that iron intakes excluding the contribution by polished rice resulted in very similar values: 7.58 mg/person/day by IC-KTDS and 7.86 mg/person/day by FNDKNHANES.
Conclusions
This study revealed that the dietary iron intake estimated by 2 different methods were quite comparable, excluding one RF, namely polished rice. KTDS was thus proven to be a useful tool in estimating a ‘closer-to-real’ dietary intake of nutrients for Koreans and further research on various nutrients is warranted.

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Dietary sodium and potassium intake of Koreans estimated using 2 different sources of their contents in foods, Food & Nutrient Database and the Korean Total Diet Study: a comparative study
Jee Yeon Lee, Sung Ok Kwon, Soo Hyun Lee, Min Jeong Seo, Gae Ho Lee, Cho-il Kim
Korean Journal of Community Nutrition.2023; 28(3): 235. CrossRef

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[English]
Estimation of Dietary Iodine Intake of Koreans through a Total Diet Study (TDS): Jeeyeon Lee, Yoonjae Yeoh, Min Jeong Seo, Gae Ho Lee, Cho-il Kim; Korean J Community Nutr 2021;26(1):48-55. Published online February 28, 2021; DOI: https://doi.org/10.5720/kjcn.2021.26.1.48

Abstract PDF

Objectives
This study was conducted to estimate the dietary iodine intake of Koreans by a Total Diet Study (TDS) which provides ‘closer-to-real’ estimates of exposure to hazardous materials and nutrients through an analysis of table-ready (cooked) samples of foods. Methods: Dietary intake data from 2013-2017 Korea National Health and Nutrition Examination Survey (KNHANES) was used to select representative foods (RFs) for iodine analysis. A total of 115 RFs were selected and 158 ‘RF × cooking method-combination’ pairs were derived by pairing each RF to corresponding cooking method(s) used more frequently. RFs were collected from 9 mega-markets in 9 metropolitan cities nationwide and mixed into composites prior to cooking preparation to a ‘table ready’ state for iodine analysis by inductively coupled plasma mass spectrometry. Iodine intake of Koreans was estimated based on the food intake data of the 2016-2018 KNHANES. Results: High iodine content was detected in seaweeds such as sea mustard and kelp. The mean iodine intake/capita/day was 418.4 ㎍ and the median value was 129.0 ㎍. Seaweeds contributed to 77.4% of the total iodine intake and the contribution by food item was as follows: sea mustard (44.0%), kelp (20.4%), laver (13.1%), milk (3.9%), egg (3.5%). Compared to the Dietary Reference Intakes for Koreans 2020, the proportion of people with iodine intake exceeding the tolerable upper intake level or below the estimated average requirement was high in the physiologically vulnerable groups (infants, children, pregnant women, and lactating women). Conclusions: The results, drawn from a TDS, are regarded closer to real estimates for iodine intake of Koreans compared with values in existing literature, which were based on a very limited variety of foods. On the other hand, it seems necessary to seek out solutions for the problematic iodine intake among physiologically vulnerable groups through in-depth analyses on food intake data collected with significant scale & quality.

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Iodine intake from brown seaweed and the related nutritional risk assessment in Koreans
Sung Ok Kwon, Kwang-Il Kwon, Mi-Young Lee, Hye Young Lee, Cho-il Kim
Nutrition Research and Practice.2024; 18(3): 412. CrossRef
High intakes of iodine among women during pregnancy and the postpartum period has no adverse effect on thyroid function
Dal Lae Ju, Sun Wook Cho, Chae Won Chung, Young Ah Lee, Gi Jeong Cheon, Young Joo Park, Choong Ho Shin, Jong Kwan Jun, June-Key Chung, Sue K. Park, YoonJu Song
European Journal of Nutrition.2023; 62(1): 239. CrossRef
Interactions between Polygenetic Variants and Lifestyle Factors in Hypothyroidism: A Hospital-Based Cohort Study
Da Sol Kim, Sunmin Park
Nutrients.2023; 15(17): 3850. CrossRef
Dietary sodium and potassium intake of Koreans estimated using 2 different sources of their contents in foods, Food & Nutrient Database and the Korean Total Diet Study: a comparative study
Jee Yeon Lee, Sung Ok Kwon, Soo Hyun Lee, Min Jeong Seo, Gae Ho Lee, Cho-il Kim
Korean Journal of Community Nutrition.2023; 28(3): 235. CrossRef
Dietary Iron Intake of Koreans Estimated using 2 Different Sources of Iron Contents are Comparable: Food & Nutrient Database and Iron Contents of Cooked Foods in the Korean Total Diet Study
Jeeyeon Lee, Sung Ok Kwon, Yoonjae Yeoh, Min Jeong Seo, Gae Ho Lee, Cho-il Kim
Korean Journal of Community Nutrition.2022; 27(3): 245. CrossRef
Effect of iodine restriction on short-term changes in thyroid function in patients with subclinical hypothyroidism
Obin Kwon, Dong Yeob Shin, Eun Jig Lee
Journal of Nutrition and Health.2022; 55(2): 250. CrossRef

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Original Articles

[English]
Breast-feeding and Obesity in Early Childhood: Based on the KNHANES 2008 through 2011: Miyong Yon, Haeng Shin Lee, Dohee Kim, Jeeyeon Lee, Jiwoon Nam, Gui Im Moon, Jinhwan Hong, Cho il Kim; Korean J Community Nutr 2013;18(6):644-651. Published online December 31, 2013; DOI: https://doi.org/10.5720/kjcn.2013.18.6.644

Abstract PDF PubReader

Although there has been a significant increase in breast-feeding (BF) rate in Korea, it is plateaued since 2008 and still low compared with that of other countries. Because BF has been related to lower obesity prevalence in many studies and the increase in childhood obesity became evident in Korea, we wondered if a relatively lower BF rate has anything to do with this increase. Therefore, we looked into the relationship between mode & duration of BF during infancy and weight status of toddlers using the data from Korea National Health and Nutrition Examination Survey 2008 through 2011. Number of 2-3 year old toddlers with complete information on BF, anthropometry and normal birth weight was 674. While 87% of them were ever-breastfed, 6.2% each of them were either obese or overweight based on the Standard Growth Chart for Korean Children. Not only the obesity prevalence was different among groups of different mode of feeding, but also the mean duration of BF was significantly longer in normal weight group (9.2 mo.) compared with obese group (5.5 mo.). Accordingly, overweight and obesity prevalence of the toddlers breast-fed for 12 months or longer was significantly lower than that of the toddlers breast-fed for less than 12 months (OR 0.53, 95% CI 0.32-0.87). This study revealed that both BF and duration of BF affect the childhood obesity and, BF for 12 months or longer should be encouraged more aggressively as one of the main strategies to prevent and/or decrease childhood obesity in Korea.

Citations

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Breastfeeding and impact on childhood hospital admissions: a nationwide birth cohort in South Korea
Jeong-Seon Lee, Jae Il Shin, Sunyeup Kim, Yong-Sung Choi, Youn Ho Shin, Jimin Hwang, Jung U Shin, Ai Koyanagi, Louis Jacob, Lee Smith, Han Eol Jeong, Yunha Noh, In-Sun Oh, Sang Youl Rhee, Chanyang Min, Seong Ho Cho, Steve Turner, Guillaume Fond, Laurent B
Nature Communications.2023;[Epub] CrossRef
Association of Infant Feeding Characteristics With Dietary Patterns and Obesity in Korean Childhood
Kyoung-Nam Kim, Moon-Kyung Shin
Journal of Preventive Medicine and Public Health.2023; 56(4): 338. CrossRef
Feeding characteristics in infancy affect fruit and vegetable consumption and dietary variety in early childhood
Kyoung-Nam Kim, Moon-Kyung Shin
Nutrition Research and Practice.2023; 17(2): 307. CrossRef
Relations among Maternal Employment, Depressive Symptoms, Breastfeeding Duration, and Body Mass Index Trajectories in Early Childhood
Jihyoung Kim
Journal of The Korean Society of Maternal and Child Health.2020; 24(2): 75. CrossRef
Knowledge and health beliefs about gestational diabetes and healthy pregnancy's breastfeeding intention
Seungmi Park, Jung Lim Lee, Jang In Sun, Youngji Kim
Journal of Clinical Nursing.2018; 27(21-22): 4058. CrossRef
Exclusive breastfeeding and partial breastfeeding reduce the risk of overweight in childhood: A nationwide longitudinal study in Korea
Seon-Joo Park, Hae-Jeung Lee
Obesity Research & Clinical Practice.2018; 12(2): 222. CrossRef
Dietary status of young children in Korea based on the data of 2013 ~ 2015 Korea National Health and Nutrition Examination Survey
Eun-kyung Kim, Byengchun Song, Se-Young Ju
Journal of Nutrition and Health.2018; 51(4): 330. CrossRef
The Relationship Between Breastfeeding Duration and Preschooler Problem Behavior: The Mediating Role of Cognitive Development
Sujeong Kang, Yea-Ji Hong, Naya Choi, Kangyi Lee
Korean Journal of Child Studies.2017; 38(6): 63. CrossRef
Factors Affecting Obesity and Overweight in Korean Preschool Children: Based on the Korea National Health and Nutrition Examination Survey 2013-2014
Inju Hwang, Kyung-Sook Bang
Child Health Nursing Research.2016; 22(4): 237. CrossRef
Dietary Habits and Nutrient Intakes according to Feeding Method during Infant Period in Elementary School Students
Myung-Hwa Kang, Mi-Kyeong Choi, Hyun-Jin Kim, Yun-Jung Bae
Journal of the Korean Society of Food Science and Nutrition.2015; 44(1): 57. CrossRef

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[English]
Influencing Factors on the Dietary supplements Consumption among Children in Korea: Jeeyeon Lee, Dohee Kim, Yoonna Lee, Eunmi Koh, Youngsoo Jang, Hyeyoung Lee, Youngae Jang, Cho il Kim; Korean J Community Nutr 2011;16(6):740-750. Published online December 31, 2011; DOI: https://doi.org/10.5720/kjcn.2011.16.6.740

Abstract PDF PubReader

With a recent increase in dietary supplements (DS) consumption among children in Korea, this study was performed to examine the influencing factors on children's DS consumption. A nationwide survey was conducted employing 3 representative samples of children for summer & fall of 2008 and spring of 2009 by stratified multistage sampling of 120 survey sites per season based on the 2005 census population. Approximately 30 households from each survey site were screened for residing children of 0-19 years and about 1,700 households remained as eligible samples per season. Trained dietitians visited households to perform face-to-face interview to children and/or parents regarding DS consumption including health functional foods (HFF), vitamins/minerals (V/M) supplements and other food supplements during 1 month prior to interview. Out of 5,328 children responded, 18.7% reported DS consumption. Consumption rate was higher in boys (19.9% vs. 17.3% in girls, P < 0.05) and youngsters (22.8% compared to 15.0% in adolescents, P < 0.001). Children from higher income family (P < 0.001), those living in apartments (P < 0.001), those residing in metropolitan area (P < 0.001), and those of mothers with higher education (P < 0.001) were more likely to take DS. Also, mother's employment status and occupation were significantly associated with children's DS consumption. The most popular DS was HFF (72.1%), which was consumed more in children of higher income family. It is revealed that socioeconomic factors affect children's DS consumption significantly. Also it is necessary to estimate children's V/M intake from DS and foods together especially because there are tolerable upper limits set for V/M for safety purposes.

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Pediatric Gastroenterology, Hepatology & Nutrition.2013; 16(2): 104. CrossRef

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[English]
Major Sources of Sodium Intake of the Korean Population at Prepared Dish Level: Based on the KNHANES 2008 & 2009: Miyong Yon, Yoonna Lee, Dohee Kim, Jeeyeon Lee, Eunmi Koh, Eunjeong Nam, Hyehyung Shin, Baeg won Kang, Jong Wook Kim, Seok Heo, Hea young Cho, Cho il Kim; Korean J Community Nutr 2011;16(4):473-487. Published online August 31, 2011; DOI: https://doi.org/10.5720/kjcn.2011.16.4.473

Abstract PDF PubReader

We attempted to define the sources of sodium intake for the Korean population at prepared dish level to provide a basis for developing sustainable nutrition policies and feasible programs for sodium intake reduction. Dietary intake data from 2008 and 2009 Korea National Health and Nutrition Examination Survey was used in the analysis for sodium intake sources. Sodium intake from individual dish consumed by each subject was calculated and used in delineating major sodium sources at dish and dish group level for sub-populations of different sex and age. Also, sodium intake was compared between eaters and non-eaters of some specific dish groups with considerable contribution to total sodium intake. The number of subjects included in the analysis was 18,022 and mean sodium intake was 4,600 mg/capita/day. Major sources of sodium intake at dish group level were in the following order: kimchi (1125 mg, 24.5%), noodles (572 mg, 12.4%), soups (488 mg, 10.6%), stews (399 mg, 8.7%), and cooked rice (284 mg, 6.2%). The magnitude of contribution to total sodium intake by soups and stews was different by age group. Sodium intake difference between eaters and non-eaters was much larger for kimchi group (2,343 mg for male, 1,452 mg for female) than for soups or stews. Interaction between consumption of aforementioned specific dish groups and age was highly significant (p < 0.0005) for both sexes. This study revealed an importance of having not only the control over sodium content of foods/dishes, but also the customized approach for different groups of population to accomplish an appreciable reduction in sodium intake.

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