• The Korean Journal of Food And Nutrition
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• v.26 no.4
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• pp.745-752
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• 2013

The purpose of this study was to define a portion size for dishes frequently consumed by Korean adults especially focusing on main dishes like rice, noodles, soups, and stews. From the original 8,019 people who took part in the Korea National Health and Nutrition Examination Survey (KNHANES) 2010, we analyzed the data for 4,556 persons aged 19 to 64 years and selected dish items consumed based on an intake frequency of 30 or more by all participants. The portion size of each dish item was set on the basis of the median amount ($50^{th}$ percentile) in a single intake by a single person. In the rice category, 15 items were selected, of which the most frequently consumed item was steamed rice with a portion size of 250ml. Among noodles and dumplings, the most frequently consumed dish was ramyeon with a portion size of 500ml. As for soups, the portion size was $250m{\ell}$ for kongnamul guk and $300m{\ell}$ for miyeoguk. In stews, the most frequently consumed items were kimchi jjigae followed by doenjang jjigae with a portion size of $200m{\ell}$ and $125m{\ell}$, respectively. In a comparison of portion sizes between the KNHANES 2010 and KNHANES 2005, the portion size of some noodles, soups, and stews tended to decrease from 2005 to 2010. Portion sizes established in this study for dish items consumed regularly by adults may be conveniently and effectively used in dietary planning, in nutritional education programs, and in assessing the dietary intake status of Korean adults.

• Journal of Nutrition and Health
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• v.41 no.6
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• pp.502-509
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• 2008

Anemia is common in Diabetes Mellitus(DM) with chronic kidney disease. Recent research suggests that DM itself also may be a risk factor of anemia even though kidney failure causes anemia. However, it has not been reported that the impact of DM on anemia in representative data of Korean population. A total of 5,417 Korean adults aged 20 years and older(2,328 men, 3,089 women) were selected from the participants of the 2005 Korean National Health and Nutrition Examination Survey(KNHANES) for this study. Anemia was defined as hemoglobin(Hb) < 13 g/dL and hematocrit(Hct) < 39% for men or Hb < 12 g/dL and Hct < 36% for women. DM was defined as a fasting blood glucose $\geq$ 126 mg/dL. Korean adults with anemia had a higher prevalence of DM than in normal adults(11.4 vs 7.5%; p<0.0001). The unadjusted odds ratio(OR) for anemia was greater in Korean men with DM than in normal men(OR=4.25; 95% CI: 2.48-7.29). This results did not differ after adjustment for the putative risk factors for anemia including chronic disease(OR=2.64; 95% CI: 1.45-4.83). However, the presence of DM was not related with anemia in Korean women. In conclusion, this study revealed that DM might be an independent risk factor for anemia in Korean men. Identification and management for anemia are needed in Korean population with DM as well.

• Journal of the East Asian Society of Dietary Life
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• v.19 no.2
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• pp.131-142
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• 2009

The principal objective of this study was to investigate regional characteristics in the consumption of home-cooked varieties of kimchi and jangajji. Data obtained from the third Korea National Health and Nutrition Examination Survey III(KNHANES Ⅲ), which was conducted in 2005, were utilized in this study. A total of 7,810 data were included in our statistical analyses, which were conducted using SPSS 14.0. The total number of home-cooked kimchi and jangajji were 22 and 11, respectively, and Korean cabbage kimchi, young radish kimchi, and kkakdugi were the top 3 varieties of kimchi. Leaf jangajji, green pepper jangajji, and garlic jangajji were most frequently consumed. Additionally, the results of this study revealed significant correlations between neighboring areas in the ranking of consumption of kimchi varieties, whereas the jangajji varieties did not evidence results as distinct as were noted with kimchi. Different kimchi and jangajji variety consumption patterns were noted between the Middle West and South areas, coastal and inland areas, and cities and provinces. Spicy kimchi varieties, in particular, were enjoyed more frequently by households in the South than those in the Middle West. Further analysis using PROXSCAL multidimensional scaling demonstrated the proximity between areas in terms of kimchi and jangajji consumption patterns. In conclusion, more effort should be extended to encourage the consumption of home-cooked regional foods.

• Clinical and Experimental Pediatrics
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• v.62 no.7
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• pp.261-268
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• 2019

Purpose: This study aimed to evaluate the time trends of waist circumference (WC) and waist-height ratio (WHR), and to present WC and WHR distributions with optimal WHR cutoff for abdominal obesity in Korean children and adolescents. Methods: We performed a retrospective cross-sectional analysis of data from 13,257 children and adolescents (6,987 boys and 6,270 girls) aged 6-18 years who were included in the third to sixth Korea National Health and Nutrition Examination Survey (KNHANES, 2005-2015). Linear regression analyses were used to identify secular changes in WC and WHR by age, sex, and KNHANES waves. A receiver operating characteristic curve analysis was used to determine the optimal WHR cutoff values for abdominal obesity and cardiometabolic risk factors. Results: The mean WC and WHR distributions from 2005 to 2015 showed no significant secular changes between the KNHANES 4 waves (P for trend ${\geq}0.05$ in all ages and both sexes). The mean WCs in the present study were lower than those in the 2007 Korean National Growth Charts. The mean WHR at ages <13 years was statistically higher in the boys than in the girls, but did not significantly differ between the sexes among those aged 13 to 18 years. The optimal WHR cutoff for abdominal obesity was 0.48 (area under the curve, 0.985; 95% confidence interval, 0.985-0.985) in the 13- to 18-year-old adolescents. Conclusion: WC and WHR showed no secular changes over 10 years. The optimal WHR cutoff for abdominal obesity of 0.48 is useful for diagnosing and managing obesity and thus preventing obesity-related cardiometabolic complications in 13- to 18-year-old Korean adolescents.

• Clinical and Experimental Pediatrics
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• v.53 no.10
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• pp.892-897
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• 2010

Purpose: This study evaluated the prevalence of the metabolic syndrome (MetS) and risk factors for metabolic derangement in young adults with childhood-onset hypopituitary growth hormone deficiency (ACOHGHD). Methods: Thirty patients with ACOHGHD who were treated with hormone-replacement therapy, aged 18 to 29 years, who visited the Seoul National University Children's Hospital between September 2009 and February 2010 were enrolled. Height, weight, waist circumference, hip circumference, and blood pressure were measured, and the clinical and hormonal features were reviewed retrospectively. We evaluated measures of metabolic derangement in the enrolled patients and in the data of healthy adults aged 20 to 29 years taken from the 2005 Korean National Health and Nutrition Examination Survey (KNHANES) as part of the National Cholesterol Education Program-the Adult Treatment Panel III. Results: Compared with the KNHANES participants, patients with ACOHGHD had significantly large waist circumference (men and women), high systolic blood pressure (BP) (women) and diastolic BP (men), and high serum triglyceride levels (women). The duration of illness correlated significantly with central obesity ($r^2$=0.546, $P$=0.003). The prevalence of MetS was 10% in patients with ACOHGHD and 2.3% in KNHANES participants. The prevalence of central obesity and MetS was higher in patients with ACOHGHD than in KNHANES participants ($P$<0.001 and $P$=0.042, respectively). Conclusion: Abdominal obesity correlated with the duration of illness in patients with ACOHGHD. Waist circumference should be measured in the clinic to prevent MetS, particularly in patients with a long history of ACOHGHD, regardless of age or sex.

• Korean Journal of Community Nutrition
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• v.16 no.4
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• pp.439-453
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• 2011

This study was performed to determine dietary and lifestyle factors associated with hypertension in Korean adolescents. Study subjects were 12~19 years (n = 521) adolescents who participated in the 2005 Korean National Health and Nutrition Examination Survey (KNHANES III). Subjects were divided into the hypertensive group (HG, n = 102) and normotensive group (NG, n = 419) by '2007 Korean children and adolescents growth standard' and the relationships between blood pressure and physical measurement, nutrients intakes, eating behaviors and health related factors were analyzed. HG showed significantly higher levels in weight, waist circumference and BMI than NG. The amount of nutrient intakes was not different between NG and HG. Index of nutritional quality (INQ) for phosphate was higher in HG compared with NG. In both male and female HG, INQ for iron was higher but INQ for vitamin B1 was lower than NG. HG revealed higher consumption frequencies of snack, yoghurt, and ice cream compared with NG. In eating and behavioral factors, 'dinner with family', 'eat proper amount', 'keep Korean traditional diet', alcohol drinking, and mean alcohol intake were significantly different between the two groups. By logistic regression method, risk factors for hypertension revealed in this study were gender (male), age (15~19 years), BMI (${\geq}\;85$ percentile), and not keeping Korean traditional diet. These results suggest that education program for hypertension prevention in adolescents should include eating habits improvement and lifestyle modification as well as weight control.

• Journal of Preventive Medicine and Public Health
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• v.41 no.3
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• pp.165-172
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• 2008

Objectives : Despite various government initiatives, including the expansion of national health insurance coverage, health inequality has been a key health policy issue in South Korea during the past decade. This study describes and compares the extent of the total health inequality and the income-related health inequality over time among Korean adults. Methods : This study employs the 1998, 2001 and 2005 Korean National Health and Nutrition Examination Surveys (KNHANESs). The self-assessed health (SAH) ordinal responses, measured on a five-point scale, resealed to cardinal values to measure the health inequalities with using interval regression. The boundaries of each threshold for the interval regression analysis were obtained from the empirical distribution of the EuroQol-5 Dimension (EQ-5D) valuation weights estimated from the 2005 KNHANES. The final model predicting the individuals' health status included age, gender, educational attainment, occupation, income, and the regional prosperity index. The concentration index was used to measure and analyze the health inequality. Results : The KNHANES data showed an unequal distribution of the total health inequality in favor of the higher income groups, and this is getting worse over time (0.0327 in 1998, 0.0393 in 2001 and 0.0924 in 2005). The income-related health inequality in 2005 was 0.0278, indicating that 30.1% of the total health inequality can be attributed to income. Conclusions : The findings indicate there are health inequalities across the sociodemographic and income groups despite the recent government's efforts. Further research is warranted to investigate what potential policy actions are necessary to decrease the health inequality in Korea.

• Korean Journal of Clinical Laboratory Science
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• v.54 no.3
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• pp.192-200
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• 2022

The association between heavy metals in the blood and obesity has been examined in many studies. However, inconsistencies have been observed in the results from these studies. The present study was conducted using data from 119,181 participants of the Korea National Health and Nutrition Examination Survey (KNHANES) for 11 years in 2005 and between 2008 and 2017. The subjects with missing heavy metal blood tests, health interview data, and health examination data were excluded from the study. The study population comprised 1,844 individuals (972 men, 872 women) who were eligible for inclusion. It was found that obesity and abdominal obesity were associated with an increase in both blood mercury (P<0.001) and alanine aminotransferase (ALT) (P<0.001). After adjusting the confounding factors, those with concurrent high levels of ALT and the highest tertile of mercury showed an increased risk of obesity (odds ratio 4.46, 95%, confidence interval 2.23~8.90, P<0.001) as well as abdominal obesity (odds ratio 5.36, 95%, confidence interval 2.57~11.17, P<0.001). The interrelationship of mercury and ALT with the parameters of body mass index (P for interaction=0.009) and waist circumference (P for interaction=0.012), respectively, have been observed to be significant, suggesting that the reciprocal relationship could contribute to obesity and abdominal obesity.

• Journal of Nutrition and Health
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• v.41 no.2
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• pp.174-183
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• 2008

Although food insecurity might be associated with poor dietary intake, this relationship has not been researched in Korea. This study examined the association of food security with dietary intake from the third Korea National Health and Nutrition Examination Survey. Food security was measured by a self-reported hunger measure on the dietary situation of subjects' households in the previous year and approximately 2/3 of the subjects lived in food-insecure households. Dietary intake was based on a 24-hour dietary recall. Food insecurity was significantly associated with low nutrients intake and nutrients intake compared to dietary reference intakes (DRI) was also lower among subjects in food-insecure households. Overall diet quality based on dietary diversity score (DDS) was worse in food-insecure subjects. Food security should be considered an important issue to public health because dietary change due to food insecurity may affect health status.

• Journal of Nutrition and Health
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• v.46 no.1
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• pp.72-85
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• 2013

The purpose of this study was to evaluate trends in the sources of dietary sodium intake in a representative Korean population in the Korea National Health and Nutrition Examination Survey (KNHANES) conducted in 1998, 2001, 2005, 2007, 2008, 2009, and 2010. The study consisted of 53,570 men and women aged 7 years or older participating in the KNHANES during the corresponding years. Overall sodium intake and the mean percent contribution of each dish and food group to dietary sodium intake across 1998-2010 were calculated. The means of sodium intake ranged between 4,572.6-5,498.9 mg/d across 1998-2010. The major dish groups contributing to dietary sodium intake were kimchi (1,154.8-1,521.2 mg/d), noodles and dumplings (505.3-760.5 mg/d), soups (465.3-714.8 mg/d), and stews and casseroles (387.0-579.8 mg/d). The combined mean percent contribution from the top four dish groups contributing to dietary sodium intake showed a slight decrease over the period; 64.4% in 1998, 64.5% in 2001, 59.3% in 2005, 58.2% in 2007, 56.3% in 2008, 56.7% in 2009, and 54.4% in 2010. The major food groups contributing to dietary sodium intake were seasonings (1,852.9-2,435.9 mg/d), vegetables (1,425.6-1,792.1 mg/d), grains (482.2-778.1 mg/d), and fish and shellfish (257.2-351.4 mg/d). In addition, the combined mean percent contribution from the top four food groups showed a slight decrease over the period; 92.8% in 1998, 93.2% in 2001, 93.8% in 2005, 92.1% in 2007, 91.7% in 2008, 90.9% in 2009, and 90.7% in 2010. In summary, we did not observe a reduction in dietary sodium intake over time, however, the percent contributions from the top major dish groups or food groups to dietary sodium intake showed a decrease over the last decade.