Korean Journal of Community Nutrition

Yoonjae Yeoh

4 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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[English]
Recommendation of Serving Size of the Meal Service of Community Child Centers in Korea: Sang Eun Lee, Jae Eun Shim, Sooyoun Kwon, Yoonjae Yeoh, Jihyun Yoon; Korean J Community Nutr 2014;19(4):361-371. Published online August 31, 2014; DOI: https://doi.org/10.5720/kjcn.2014.19.4.361

Abstract PDF PubReader

OBJECTIVES
This study was performed to set easily applicable portion sizes by sex and age for children at the Community Child Centers (CCC) in Korea.
METHODS
Considering the age and gender specific energy level at Target Patterns for children aged 6-18 years, which were suggested as a part of the 2010 Korean Food Guidance System (KFGS), we set three meal sizes. We reclassified the recommended daily servings of Grains, Meat.fish.eggs.beans and Vegetables group at Target Patterns into three meal sizes, and then calculated the recommended serving per meal. Each proposed amount of food per meal was calculated based on serving size of foods commonly eaten at KFGS, which was then allocated to five meal components; rice, soup, stew, protein and vegetable side-dishes and Kimchi. Each proposed amount of food per meal was applied to 173 menus' recipes from CANpro 3.0 as main ingredient's amounts. We cooked the 173 menus at the medium size and measured their weights after cooking.
RESULTS
Each recommended serving per meal was 0.75, 0.9 and 1.2 for Grains; 1.2, 1.6 and 2.4 for Meat.fish.eggs.beans; 2, 2.4 and 2.8 for Vegetables by meal sizes. Among five meal components, the ratio of small and large to medium size was 1/5 less and 1/3 more for rice and 1/3 less and 1/3 more for soup.stew, protein side-dish and Kimchi, respectively. We suggested the same amount for a vegetable side-dish to encourage vegetable intake. Proper portion sizes per meal of medium were rice 190 g, soup.stew 210 g (solid ingredients 60 g), protein side-dish 100 g (meat.eggs.beans) and 70 g (fish), vegetable side-dish 80g and Kimchi 30 g.
CONCLUSIONS
Proper portion size per meal suggested in this study may be useful at the CCC where dietitians are not available and the approach could be applicable to the other types of meal services.

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Effects of Multidisciplinary Health Promotion Program Among Children in Community Childcare Center
Yerin Kim, Gyeong Seob Shin, Jungwon Park, Minji Kang, Kumhee Son, Yoon Myung Kim, Kyung Hee Park, Hyunjung Lim
Clinical Nutrition Research.2024; 13(1): 8. CrossRef
Evaluation of Dietary Behavior and Nutritional Status of Children at Community Child Center in Busan Area Using Nutrition Quotient
Kyung-A Lee, Ha-Yeon Park, Eun-Soon Lyu
Korean Journal of Food and Cookery Science.2018; 34(4): 424. CrossRef
Investigation of the Management of Foodservice Facilities inCommunity Child Centers in Daegu and Gyeongbuk Area
Suk-Hyeon Park, Hyeon-A Jung
Journal of the East Asian Society of Dietary Life.2017; 27(4): 459. CrossRef
Intakes and Satisfaction of Home-delivered Meal Box for Children from Low-income Families in Chungcheongbuk-do, Korea
Gyusang Han, Sooyoun Kwon
The Korean Journal of Food And Nutrition.2016; 29(5): 716. CrossRef
Assessment of Foodservice and Cooking Program for Children Attending Community Child Centers in Korea
Sooyoun Kwon, Yoonjae Yeoh
Journal of the East Asian Society of Dietary Life.2016; 26(3): 223. CrossRef
tatus of Meal Serving and Nutritional Quality of Foods Served for Children at Community Child Centers in Korea
Sooyoun Kwon, Yoonjae Yeoh
Journal of the East Asian Society of Dietary Life.2015; 25(2): 352. CrossRef

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[English]
Teachers' Participation and Mealtime Instruction in the Food Service at the Kwanak-gu Child-care Centers: Comparison between Child-care Teachers Caring Different Age Groups, Children Younger than Three Years and Those Three Years or Older: Yoonjae Yeoh, Sooyoun Kwon, Jihyun Yoon; Korean J Community Nutr 2013;18(2):112-124. Published online April 30, 2013; DOI: https://doi.org/10.5720/kjcn.2013.18.2.112

Abstract PDF PubReader

This study was conducted to investigate how child-care teachers participate, practice mealtime instruction, and perceive difficulties in food service, focusing on comparison between the teachers caring two different age groups: children younger than three years (Younger Group) and those three years or older (Older Group). Questionnaires were distributed to 151 child-care centers in Kwanak-gu, Seoul, Korea during December, 2011. Only the data from 25 child-care centers, where two respective teachers in charge of Younger Group and Older Group completed the questionnaires, were analyzed. The results showed that there was no difference in terms of child-care teachers' participation in food service practice between the two groups, except for serving method; 'Pre-plated' serving was used significantly more often in Younger Group, whereas 'Line-up' serving was used in Older Group. Approximately, three quarters of the child-care centers had policies or guidelines on mealtime instruction. During mealtime, child-care teachers tended to use frequently verbal instructions such as "sit up straight when you eat" about eating manner, "don't be picky with your food" about eating habit, and "wash your hands before eating" about eating procedure in both the groups. There was no statistically significant difference regarding child-care teachers' perceived difficulties in food service between the two groups. These results indicated that child-care teachers' participation and mealtime instruction in food service did not differ between the two age groups, although children's development of digestion and eating skill differed by age. Therefore, training should be provided to child-care teachers about food service practices and mealtime instruction appropriate to children's age.

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Analysis of the Importance-Performance Related service management and feeding practices of teachers at mealtime in childcare centers
Yoonjae Yeoh, Sooyoun Kwon
Journal of Nutrition and Health.2015; 48(3): 289. CrossRef
Effects of an Education Program on Sanitation Status at Centers for Children's Food Service Management: Focusing on Jung-gu and Dong-gu regions of Daejeon Metropolitan City
Yu-Jin Seo, Min-Sun Jeon
Korean Journal of Community Nutrition.2015; 20(6): 447. CrossRef

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