Epidemiology and Health

Original Articles

Impact of body mass index and waist-to-hip ratio on mortality in middle-aged Koreans: a prospective cohort study based on a Health Examinees study: Sooyoung Cho, Aesun Shin, Ji-Yeob Choi, Jong-Koo Lee, Daehee Kang; Epidemiol Health. 2024;46:e2024073. Published online September 2, 2024; DOI: https://doi.org/10.4178/epih.e2024073

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Abstract Summary PDF: Abstract
OBJECTIVES
We aimed to assess the impact of obesity on mortality in middle-aged Koreans using data from a Health Examinees study.
METHODS
We used data from the participants who had complete information on body size and gave informed consent for the linkage of their data with the national death certificate data. Cox proportional hazard model was used to estimate the hazard ratios and 95% confidence intervals (CIs) of body mass index (BMI) and waist-to-hip ratio (WHR) for all-cause, cardiovascular, and cancer mortality.
RESULTS
A total of 115,961 participants were included in the study. The results showed a U-shaped association between BMI and mortality, indicating that both males and females with BMIs of less than 21.0 kg/m2 and greater than or equal to 30.0 kg/m2 are at increased risk. The results showed that males with a BMI of less than 18.5 kg/m² had a significantly higher risk of all-cause mortality (adjusted hazard ratio [aHR], 2.24; 95% CI, 1.73 to 2.91) and cardiovascular mortality (aHR, 2.27; 95% CI, 1.23 to 4.20). Similarly, males with a WHR of less than 0.80 (aHR, 1.38; 95% CI, 1.08 to 1.77), 0.90 to less than 0.95 (aHR, 1.15; 95% CI, 1.02 to 1.29), and greater than or equal to 0.95 (aHR, 1.28; 95% CI, 1.11 to 1.47) showed an increased risk of all-cause mortality. In females, a BMI of less than 18.0 kg/m2 was linked to a higher risk of cardiovascular mortality (aHR, 2.67; 95% CI, 1.13 to 6.33).
CONCLUSIONS
Being underweight was associated with an increased risk of mortality in both sexes, and the lowest risk of death was found in males who were slightly overweight with a BMI of 23.0-25.0 kg/m2.; Summary

Korean summary
중년 한국인으로 구성된 코호트 연구에서 BMI와 WHR이 원인별 사망에 미치는 영향을 평가함. BMI와 WHR이 사망 원인별 사망률과 U자형 연관성을 보였고, 특히 심혈관 질환에서 이러한 경향을 관찰함.

Key Message
This study examined the association between BMI, WHR, and cause-specific mortality in middle-aged Koreans. Both BMI and WHR showed U-shaped associations with mortality, particularly for cardiovascular outcomes. These findings may indicate a need to carefully consider the optimal BMI cut-off values for Asians to better capture mortality risks.

Comparative analysis of body mass index and obesity-related anthropometric indices for mortality prediction: a study of the Namwon and Dong-gu cohort in Korea: Ye Rim Kim, Min-Ho Shin, Young-Hoon Lee, Seong-Woo Choi, Hae-Sung Nam, Jeong-Ho Yang, Sun-Seog Kweon; Epidemiol Health. 2024;46:e2024066. Published online July 17, 2024; DOI: https://doi.org/10.4178/epih.e2024066

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Abstract

OBJECTIVES
This study investigated the associations between several obesity-related anthropometric indices and mortality in middle-aged and elderly populations to compare the indices’ predictive ability with that of the body mass index (BMI).

METHODS

We analyzed data on 12 indices calculated from 19,805 community-based cohort participants (average age, 63.27 years; median follow-up, 13.49 years). Each index was calculated using directly measured values of height, weight, waist circumference (WC), and hip circumference (HC). We calculated hazard ratios (HRs) and 95% confidence intervals (CIs) for each index using Cox regression and evaluated mortality prediction with the Harrell concordance index (c-index).

RESULTS

Adding anthropometric indices to the basic mortality model (c-index, 0.7723; 95% CI, 0.7647 to 0.7799) significantly increased the predictive power of BMI (c-index, 0.7735; 95% CI, 0.7659 to 0.7811), a body shape index (ABSI; c-index, 0.7735; 95% CI, 0.7659 to 0.7810), weight-adjusted waist index (WWI; c-index, 0.7731; 95% CI, 0.7656 to 0.7807), and waist to hip index (WHI; c-index, 0.7733; 95% CI, 0.7657 to 0.7809). The differences between the BMI model and the other 3 models were not statistically significant.

CONCLUSIONS

In predicting all-cause mortality, the ABSI, WWI, and WHI models based on WC or HC had stronger predictive power than conventional risk factors but were not significantly different from the BMI model.

Summary

Korean summary
- 다수의 비만관련 신체계측지표들이 사망률을 유의하게 예측하였지만 체질량지수보다 통계적으로 우월하지는 않았다. - 복부둘레가 고려된 비만지표들이 사망률예측에 더 유용할 것으로 추정된다.

Key Message
- Several obesity indices provided predictive value for all-cause mortality but were not superior to body mass index - Obesity indices that take abdominal circumference into account are likely to be more useful for predicting mortality.

Citations

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Accumulated subcutaneous fat in abdomen is associated with long COVID-19 symptoms among non-hospitalized patients: a prospective observational study
Tingxin Li, Baoming He, Yuping Liu, Chen Wang
Frontiers in Medicine.2024;[Epub] CrossRef

Mediating effect of lower extremity muscle on the relationship between obesity and osteoarthritis in middle-aged and elderly women in Korea: based on the 2009-2011 Korea National Health and Nutrition Examination Survey: Minjun Kim, Joonwoong Kim, Inhwan Lee; Epidemiol Health. 2024;46:e2024027. Published online February 2, 2024; DOI: https://doi.org/10.4178/epih.e2024027

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
This study investigated whether the lower extremity muscle mass index (LMI) mediates the relationship between general obesity, central obesity, and knee osteoarthritis in middle-aged and elderly women in Korea.

METHODS

Data of 2,843 women aged ≥50 years were collected from the Korean National Health and Nutrition Examination Survey conducted between 2009 and 2011. General obesity and central obesity were evaluated based on body mass index (BMI) and waist circumference (WC), calculated through anthropometric measurements and body composition assessments. LMI was calculated by dividing the muscle mass in both legs—measured using the dual-energy X-ray absorptiometry—by body weight. Knee osteoarthritis was defined as a Kellgren-Lawrence scale (KL) grade of ≥2 as assessed through radiographic images.

RESULTS

Knee osteoarthritis prevalence, indicated by KL grades, was significantly higher in the general obesity and central obesity groups compared to the normal group, and conversely, lower with varying LMI levels. Using mediation analysis with bootstrapping and adjusting for covariates, we found that LMI mediated the relationship between BMI and KL (β, 0.005; 95% confidence interval [CI], 0.000 to 0.010) and WC and KL grade (β, 0.002; 95% CI, 0.001 to 0.003), explaining 4.8% and 6.7% of the total effects of BMI and WC on KL grade, respectively.

CONCLUSIONS

The study suggested that LMI partially mediates the link between general obesity and/or central obesity and knee osteoarthritis, proposing that a higher proportion of lower limb muscle mass relative to body weight can alleviate the increased risk of knee osteoarthritis caused by obesity.

Summary

Korean summary
본 연구는 한국의 50세 이상 여성들을 대상으로 비만 및 복부비만과 무릎골관절염의 관계에 대한 다리근육비율의 매개 효과를 분석한 결과, 다리근육비율은 비만의 진단하는 사용되는 체질량지수, 복부비만의 진단에 사용되는 허리둘레와 무릎 골관절염의 진단에 사용되는 KL등급의 관계를 부분적으로 매개하는 것으로 나타났다. 이러한 결과는 다리근육의 강화가 비만 및 복부비만으로 인한 무릎골관절염의 위험을 완화할 수 있음을 시사하며, 건강한 생활습관과 규칙적인 근력운동의 병행을 통해 다리 근육을 강화하는 것이 무릎 골관절염의 예방을 위한 전략으로 권장되어야 함을 시사한다.

Key Message
Research examining the mediating effect of lower extremity muscle mass on the relationships of knee osteoarthritis to general and central obesity is scarce. Herein, we demonstrate the mediating effect of lean mass index on the relationships of knee osteoarthritis with body mass index and waist circumference in Korean women aged 50 years or older. We propose that strengthening leg muscles may mitigate, to some extent, the risk of knee osteoarthritis associated with general and central obesity. We recommend a regimen for strengthening leg muscles through healthy lifestyle habits and regular strength training, in conjunction with weight and abdominal fat management.

Citations

Citations to this article as recorded by

Revealing the mediating mechanisms between BMI and osteoarthritis: a Mendelian randomization and mediation analysis
Hui Yu, Junxiang Wang, Xin Xu, Hui Li, Junfei Guo
Aging Clinical and Experimental Research.2025;[Epub] CrossRef
Roles of low muscle strength and sarcopenic obesity on incident symptomatic knee osteoarthritis: A longitudinal cohort study
Laijun Yan, Haiya Ge, Zhengming Wang, Anping Shen, Qinguang Xu, Ding Jiang, Yuelong Cao, Simone Agostini
PLOS ONE.2024; 19(10): e0311423. CrossRef
Letter to the Editor: Mediating effect of lower extremity muscle on the relationship between obesity and osteoarthritis in middle-aged and elderly women in Korea: based on the 2009-2011 Korea National Health and Nutrition Examination Survey
Jinyue Chen, Haozhu Chen
Epidemiology and Health.2024; 46: e2024091. CrossRef

Higher energy consumption in the evening is associated with increased odds of obesity and metabolic syndrome: findings from the 2016-2018 Korea National Health and Nutrition Examination Survey (7th KNHANES): Sarang Jeong, Hajoung Lee, Sukyoung Jung, Jee Young Kim, Sohyun Park; Epidemiol Health. 2023;45:e2023087. Published online September 19, 2023; DOI: https://doi.org/10.4178/epih.e2023087

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
Chrono-nutrition emphasizes meal timing in preventing obesity and metabolic disorders. This study explores the impact of temporal dietary patterns (TDPs) on obesity and metabolic syndrome (MetS) in Korean adults aged 20 years to 65 years.

METHODS

We utilized dynamic time warping method and Kernel k-means clustering to investigate diet quality and the odds ratios (ORs) of obesity and MetS with different TDPs using data from the 7th Korea National Health and Nutrition Examination Survey.

RESULTS

Participants were divided into three groups based on relative energy intake over 24 hours. After adjusting for age and gender, Cluster 3 (with the highest proportion of energy intake in the evening) had the lowest Healthy Eating Index scores compared to other clusters. Following adjustment for key covariates, Cluster 3 showed the highest values for body mass index, waist circumference, blood pressure, total cholesterol, and triglycerides. Compared to Cluster 1 (with a lower proportion of energy intake in the evening), Cluster 2 and Cluster 3 had ORs for obesity of 1.12 (95% confidence interval [CI], 0.97 to 1.30) and 1.19 (95% CI, 1.03 to 1.37), respectively. For MetS, the ORs were 1.26 (95% CI, 1.08 to 1.48) and 1.37 (95% CI, 1.17 to 1.61) when comparing Cluster 2 and Cluster 3 to Cluster 1.

CONCLUSIONS

This study reveals that individuals with higher energy intake in the evening have increased odds of obesity and MetS, even after adjusting for major covariates, including age and total energy intake.

Summary

Korean summary
본 연구는 하루 중 주요 에너지 섭취 사간에 따른 인구사회학적 특징과 건강지표의 상관성을 분석하였다. 제 7기 국민건강영양조사의 20~65세의 한국 성인을 대상으로 Dynamic Time Warping 방법을 이용하여 군집을 나누어 분석한 결과, 하루 중 저녁시간에 에너지 섭취가 높은 그룹이 그렇지 않은 그룹에 비해 연령이 낮고, 흡연자, 음주자, 스트레스를 느끼는 대상자의 비율이 높았다. 또한, 저녁에 에너지 섭취 비율이 높은 그룹이 그렇지 않은 그룹에 비해 체질량지수, 허리둘레, 혈압, 총 콜레스테롤, 중성지방이 높았으며, 식생활 평가 지수가 가장 낮았다. 마지막으로 하루 섭취하는 총 에너지 양과 생활습관 변수를 보정하고도 저녁에 섭취하는 에너지가 많은 그룹은 그렇지 않은 그룹에 비해 비만 및 대사 증후군 유병이 더 높은 것으로 나타났다.

Key Message
• This study examined the relationship between sociodemographic characteristics and health indicators based on the timing of major energy intake during the day. • Using the Dynamic Time Warping method, the analysis revealed that the group with higher evening energy intake was younger and had a higher proportion of smokers, alcohol consumers, and individuals experiencing stress. • Additionally, the group with higher evening energy intake exhibited higher levels of obesity and metabolic syndrome, even after adjusting for total daily energy intake and lifestyle variables.

Citations

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Dietary calcium intake in relation to metabolic syndrome in adults: A systematic review and dose–response meta‐analysis of epidemiological studies with GRADE assessment
Roxana Nematbakhsh, Parisa Rouhani, Parvane Saneei
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Associations of cumulative average dietary total antioxidant capacity and intake of antioxidants with metabolic syndrome risk in Korean adults aged 40 years and older: a prospective cohort study (KoGES_CAVAS): Ji-Sook Kong, Jiseon Lee, Youngjun Kim, Hye Won Woo, Min-Ho Shin, Sang Baek Koh, Hyeon Chang Kim, Yu-Mi Kim, Mi Kyung Kim; Epidemiol Health. 2023;45:e2023067. Published online July 28, 2023; DOI: https://doi.org/10.4178/epih.e2023067

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
Limited and inconsistent prospective evidence exists regarding the relationship of dietary total antioxidant capacity (dTAC) and antioxidant intake with metabolic syndrome (MetS) risk. We evaluated the associations of the cumulative averages of dTAC and antioxidant intake (in 5 classes: retinol, vitamin C, vitamin E, carotenoids, and flavonoids, as well as 7 flavonoid subclasses) with the risk of MetS.

METHODS

This study included 11,379 participants without MetS, drawn from the Korean Genome and Epidemiology Study_CArdioVascular disease Association Study (KoGES_CAVAS). The cumulative average consumption was calculated using repeated food frequency questionnaires. Incidence rate ratios were estimated using a modified Poisson regression model with a robust error estimator.

RESULTS

The median follow-up period was 5.16 years, and 2,416 cases of MetS were recorded over 58,750 person-years. In men, significant inverse associations were observed in all 5 antioxidant classes, except for the highest quartile of dTAC. In women, dTAC and total flavonoids were not significantly associated with MetS; however, significant L-shaped associations were found for the remaining 4 antioxidant classes. Of the 7 flavonoid subclasses, only flavones in the highest quartile for men and flavan-3-ols in women lacked significant associations with MetS. The inverse associations were not sex-specific, but they were particularly pronounced among participants with a body mass index (BMI) of 23 kg/m2 or higher.

CONCLUSIONS

The findings suggest that most antioxidant classes and flavonoid subclasses, unlike dTAC, exhibit a clear beneficial association with MetS in an L-shaped pattern in both men and women, particularly those with a high BMI.

Summary

Korean summary
농촌코호트 조사 참여자를 대상으로 식이 총항산화능, 총항산화능 하위분류, 플라보노이드 하위분류와 대사증후군 발생 위험의 전향적 연관성을 평가한 결과, 대부분의 항산화물(5개항산화물 분류:4개 항산화 비타민과 플라보노이드; 플라보노이드 7개 하부분류)에서 대사증후군과 음의 상관성을 확인할 수 있었으며 총항산화능(남자와 여자)과 플라보노이드(여자)에서 약한 연관성을 보였다. 남녀간 유의한 상호작용은 없었고 특히 BMI가 높은 집단에서 두드러졌다. 이 연구의 결과는 특히 식이 총항산화능을 구성하는 하위 유형을 적절히 섭취하는 것이 특히 비만한 성인에서 대사증후군 위험을 낮추는 예방전략으로 효과가 있을 수 있음을 시사한다.

Key Message
We observed that the cumulative average of dietary antioxidant vitamins and most flavonoids may be have pivotal roles in prevention of MetS, although there may be weak associations of dTAC and flavonoids in women. Moreover, these inverse associations were more pronounced in high BMI individuals. Our results suggest that the consumption of antioxidants and flavonoid may mitigate the MetS risk, particularly in overweight/obese individuals at high risk of developing chronic diseases.

Citations

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Increased circulating apolipoprotein Cs are implicated in the association between elevated serum retinol and retinol-binding protein 4 and adverse progression of metabolic syndrome in adults: A prospective study
Danyu Chen, Keliang Xie, Chang Gao, Yingdi Yang, Ying Xu, Bang-yan Li, Yue Xi, Ju-Sheng Zheng, Yu-ming Chen
The Journal of Nutritional Biochemistry.2025; 140: 109892. CrossRef
The association of dietary total flavonoids and their subclasses with the risk of type 2 diabetes: a prospective cohort study
Hye Won Woo, Mi Kyung Kim, Kong Ji-Sook, Jiseon Lee, Min-Ho Shin, Sang Baek Koh, Hyeon Chang Kim, Yu-Mi Kim
European Journal of Nutrition.2024; 63(4): 1339. CrossRef
A Systematized Review of the Relationship Between Obesity and Vitamin C Requirements
Julia K Bird, Edith JM Feskens, Alida Melse-Boonstra
Current Developments in Nutrition.2024; 8(5): 102152. CrossRef
Expansion of a food composition database for the food frequency questionnaire in the Korean Genome and Epidemiology Study (KoGES): a comprehensive database of dietary antioxidants and total antioxidant capacity
Jiseon Lee, Ji-Sook Kong, Hye Won Woo, Mi Kyung Kim
Epidemiology and Health.2024; 46: e2024050. CrossRef

Regional differences in the associations of diet quality, obesity, and possible sarcopenia using the seventh Korea National Health and Nutrition Examination Survey (2016-2018): Hyeongyeong Lee, Sohyun Park; Epidemiol Health. 2023;45:e2023059. Published online June 19, 2023; DOI: https://doi.org/10.4178/epih.e2023059

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Abstract PDF

Abstract

OBJECTIVES
Sarcopenic obesity is closely related to aging and the prevalence of various chronic diseases and frailty. The purpose of this study was to analyze whether diet quality is related to obesity, sarcopenia, and sarcopenic obesity, and if so, to explore the difference in that relationship between urban and rural settings.

METHODS

Using data from the Korea National Health and Nutrition Examination Survey of 2016-2018, a total of 7,151 participants aged 40 years or older were analyzed. Sarcopenia was diagnosed using handgrip strength. Diet quality was assessed using Korea Healthy Eating Index (KHEI) scores, and obesity was determined based on participants’ abdominal circumference. Multinomial logistic analysis was used for testing statistical significance.

RESULTS

Rural participants had significantly lower KHEI scores and a higher prevalence of sarcopenic obesity than urban participants. The study findings demonstrate that participants without obesity, sarcopenia, or sarcopenic obesity had significantly higher KHEI scores in both rural and urban settings. Multinomial regression analysis further revealed that a higher KHEI score was associated with a lower risk of sarcopenia and sarcopenic obesity among urban residents, while only the risk of obesity was lower with higher diet quality scores among rural residents.

CONCLUSIONS

Since diet quality and health status were lower in rural areas, it is important to address this regional disparity with appropriate policy measures. To mitigate urban health disparities, urban residents in poor health with few resources should also be supported.

Summary

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Association between triglyceride-glucose index and sarcopenic obesity in adults: a population-based study
Zhengmei Zhao, Ruiting Cai, Lili Tao, Yuxiao Sun, Keping Sun
Frontiers in Nutrition.2025;[Epub] CrossRef
Association of Dietary Protein Sources and Their Adequacy, Body Composition and Risk of Sarcopenic Obesity in South Korean Populations: A Cross-Sectional Study
Jieun Kim, Kyoungsik Jeong, Sueun Lim, Siwoo Lee, Younghwa Baek
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Changes in metabolic syndrome and the risk of breast and endometrial cancer according to menopause in Korean women: Thi Xuan Mai Tran, Soyeoun Kim, Boyoung Park; Epidemiol Health. 2023;45:e2023049. Published online May 1, 2023; DOI: https://doi.org/10.4178/epih.e2023049

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
This study investigated how changes in metabolic syndrome (MetS) are associated with the subsequent risk of breast and endometrial cancer according to menopausal status.

METHODS

This cohort study, using data from the National Health Insurance Service database, included women aged ≥40 years who underwent 2 biennial cancer screenings (2009-2010 and 2011-2012) and were followed up until 2020. Participants were grouped into MetS-free, MetS-recovery, MetS-development, and MetS-persistent groups. Menopausal status (premenopausal, perimenopausal, and postmenopausal) was assessed at 2 screenings. Cox proportional hazard regression was used to assess the association between MetS changes and cancer risk.

RESULTS

In 3,031,980 women, breast and endometrial cancers were detected in 39,184 and 4,298, respectively. Compared with the MetS-free group, those who recovered, developed, or had persistent MetS showed an increased risk of breast cancer, with adjusted hazard ratios (aHRs) of 1.05, 1.05, and 1.11, respectively (p<0.005). MetS persistence was associated with an increased risk of breast cancer in postmenopausal women (aHR, 1.12, 95% confidence interval [CI], 1.08 to 1.16) but not in premenopausal or perimenopausal women. MetS persistence was associated with an increased risk of endometrial cancer in premenopausal, perimenopausal, and postmenopausal women, with aHRs of 1.41 (95% CI, 1.17 to 1.70), 1.59 (95% CI, 1.19 to 2.12), and 1.47 (95% CI, 1.32 to 1.63), respectively.

CONCLUSIONS

Increased breast cancer risk was associated with recovered, developed, and persistent MetS in postmenopausal women. Meanwhile, increased endometrial cancer risk was found in obese women who recovered from MetS or persistently had MetS, regardless of menopausal status, when compared to MetS-free women.

Summary

Korean summary
- 폐경후 여성에서 대사증후군이 회복되었거나, 지속적으로 대사증후군을 앓고 있거나, 대사증후군이 발병한 여성은 유방암 위험과 관련이 있었습니다. - 한편, 폐경 상태와 관계없이 대사증후군에서 회복되었거나 지속적으로 대사증후군를 앓고 있는 비만 여성은 대사증후군이 없는 여성에 비해 자궁내막암 위험이 증가하는 것으로 나타났습니다.

Key Message
- Increased breast cancer risk was associated with recovered, developed, and persistent MetS in postmenopausal women. - Increased endometrial cancer risk was found in obese women who recovered from MetS or persistently had MetS, regardless of menopausal status, when compared to MetS-free women.

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Jinwei Song, Songkun Gao, Lixia Zhao, Xiaolong Tong
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The associations of obesity phenotypes with the risk of hypertension and its transitions among middle-aged and older Chinese adults: Ziyue Sheng, Shang Lou, Jin Cao, Weidi Sun, Yaojia Shen, Yunhan Xu, Ziyang Ren, Wen Liu, Qian Yi, Peige Song; Epidemiol Health. 2023;45:e2023043. Published online April 10, 2023; DOI: https://doi.org/10.4178/epih.e2023043

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
This study aimed to investigate the associations of obesity phenotypes with hypertension stages, phenotypes, and transitions among middle-aged and older Chinese.
METHODS
Using the 2011-2015 waves of the China Health and Retirement Longitudinal Study, we conducted a cross-sectional analysis included 9,015 subjects and a longitudinal analysis included 4,961 subjects, with 4,872 having full data on the hypertension stage and 4,784 having full data on the hypertension phenotype. Based on body mass index and waist circumstance, subjects were categorized into 4 mutually exclusive obesity phenotypes: normal weight with no central obesity (NWNCO), abnormal weight with no central obesity (AWNCO), normal weight with central obesity (NWCO), and abnormal weight with central obesity (AWCO). Hypertension stages were classified into normotension, pre-hypertension, stage 1 hypertension, and stage 2 hypertension. Hypertension phenotypes were categorized as normotension, pre-hypertension, isolated systolic hypertension (ISH), isolated diastolic hypertension (IDH), and systolic-diastolic hypertension (SDH). The association between obesity phenotypes and hypertension was estimated by logistic regression. A comparison between different sexes was conducted by testing the interaction effect of sex.
RESULTS
NWCO was associated with normal→stage 2 (odds ratio [OR], 1.95; 95% confidence interval [CI], 1.11 to 3.42), maintained stage 1 (OR, 1.62; 95% CI, 1.14 to 2.29), and normal→ISH (OR, 1.39; 95% CI, 1.05 to 1.85). AWCO was associated with normal→stage 1 (OR, 1.75; 95% CI, 1.40 to 2.19), maintained stage 1 (OR, 2.77; 95% CI, 2.06 to 3.72), maintained stage 2 (OR, 2.80; 95% CI, 1.50 to 5.25), normal→ISH (OR, 1.56; 95% CI, 1.20 to 2.02), and normal→SDH (OR, 2.54; 95% CI, 1.72 to 3.75). An interaction effect of sex existed in the association between obesity phenotypes and hypertension stages.
CONCLUSIONS
This study highlights the importance of various obesity phenotypes and sex differences in hypertension progression. Tailored interventions for different obesity phenotypes may be warranted in hypertension management, taking into account sex-specific differences to improve outcomes.; Summary

Key Message
This study elucidates the distinct associations between obesity phenotypes and various hypertension stages and phenotypes. Furthermore, it reveals significant sex differences in the risk for hypertension stages, phenotypes, and transitions, providing essential insights for targeted interventions and personalized medicine.

The association between obesity and glaucoma in older adults: evidence from the China Health and Retirement Longitudinal Study: Xiaohuan Zhao, Qiyu Bo, Junran Sun, Jieqiong Chen, Tong Li, Xiaoxu Huang, Minwen Zhou, Jing Wang, Wenjia Liu, Xiaodong Sun; Epidemiol Health. 2023;45:e2023034. Published online March 9, 2023; DOI: https://doi.org/10.4178/epih.e2023034

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Abstract Summary PDF

Abstract

OBJECTIVES
This study evaluated the association between obesity and glaucoma in middle-aged and older people. A population-based retrospective cohort study was conducted using data from the China Health and Retirement Longitudinal Study.

METHODS

Glaucoma was assessed via self-reports. Multivariate logistic regression analysis and a Cox proportional hazards model were used to assess the relationship between obesity and glaucoma risk.

RESULTS

Older males living in urban areas who were single, smokers, and non-drinkers were found to have a significantly higher incidence of glaucoma (all p<0.05). Diabetes, hypertension, and kidney disease were also associated with higher glaucoma risk, while dyslipidemia was associated with lower risk (all p<0.05). After the model was adjusted for demographic, socioeconomic, and health-related variables, obesity was significantly associated with a 10.2% decrease in glaucoma risk according to the Cox proportional hazards model (hazard ratio, 0.90; 95% confidence interval [CI], 0.83 to 0.97) and an 11.8% risk reduction in the multivariate logistic regression analysis (odds ratio, 0.88; 95% CI, 0.80 to 0.97). A further subgroup analysis showed that obesity was associated with a reduced risk of glaucoma in people living in rural areas, in smokers, and in those with kidney disease (all p<0.05). Obesity also reduced glaucoma risk in people with diabetes, hypertension, or dyslipidemia more than in healthy controls (all p<0.05).

CONCLUSIONS

This cohort study suggests that obesity was associated with a reduced risk of glaucoma, especially in rural residents, smokers, and people with kidney disease. Obesity exerted a stronger protective effect in people with diabetes, hypertension, or dyslipidemia than in healthy people.

Summary

Key Message
Glaucoma is a neurodegenerative disease and the leading cause of irreversible vision loss worldwide. The diagnosis of glaucoma is frequently delayed, as it may be asymptomatic until a relatively late stage. Thus, there is a need to identify protective and risk factors for glaucoma. Glaucoma is a multifactorial disease, and the impact of obesity on glaucoma risk remains uncertain. This study evaluated the association between obesity and glaucoma in middle-aged and older people. This cohort study suggests that obesity was associated with a reduced risk of glaucoma, especially in rural residents, smokers, and people with kidney disease.

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Evaluating the impact of caloric restriction, body mass index and exercise on primary open-angle glaucoma: A review
Jonathan YM Lai, Patrick Mclarnon, Carl Sheridan, Neeru A Vallabh
European Journal of Ophthalmology.2025; 35(2): 429. CrossRef
Obesity and its management in primary care setting
Mahmoud Ibrahim, Ebtesam M. Ba-Essa, Jessica A. Alvarez, Jason Baker, Vincenzo Bruni, Avivit Cahn, Antonio Ceriello, Francesco Cosentino, Melanie J. Davies, Francesco De Domenico, Robert H. Eckel, Allon N. Friedman, Jonathan Goldney, Omer Hamtzany, Scott
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Trends in socioeconomic inequalities in obesity among Korean adolescents: the Korea Youth Risk Behavior Web-based Survey (KYRBS) 2006 to 2020: Eunji Kim, Ga Bin Lee, Dong Keon Yon, Hyeon Chang Kim; Epidemiol Health. 2023;45:e2023033. Published online March 7, 2023; DOI: https://doi.org/10.4178/epih.e2023033

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
This study investigated recent trends in the prevalence of obesity among Korean adolescents and explored socioeconomic disparities in obesity.

METHODS

This study used annual self-reported data on height, weight, and socioeconomic information from the Korea Youth Risk Behavior Web-based Survey from 2006 to 2020. With a 95.8% response rate, the sample consisted of 818,210 adolescents. Obesity prevalence was calculated according to 4 socioeconomic indicators (household income, father’s educational attainment, mother’s educational attainment, and urbanicity). Socioeconomic inequality was quantified using the relative index of inequality (RII).

RESULTS

The overall prevalence of obesity increased, doubling from 5.9% in 2006 to 11.7% in 2020. Boys and high school students showed a higher prevalence. The RIIs in household income and parental educational attainments significantly increased with time, indicating a growing inequality in obesity. Socioeconomic disadvantages had a greater influence on obesity among girls. The most recent RII values for boys were 1.25 for income, 1.79 for the father’s education, and 1.45 for the mother’s education, whereas the corresponding values for girls were 2.49, 3.17, and 2.62, respectively.

CONCLUSIONS

These findings highlight growing inequalities in adolescent obesity according to household income and parental educational attainments, especially for girls and middle schoolers.

Summary

Korean summary
2006년부터 2020년까지 청소년 비만의 유병은 증가 추세에 있을 뿐 아니라, 가정의 경제상태, 부모의 학력수준에 따른 비만의 위험 격차도 점점 심해지는 추세를 보였다. 특히, 남학생과 고등학생의 비만 유병률이 높게 나타났으나, 사회경제적 지표에 따른 비만의 불평등 격차는 여학생과 중학생에서 높게 나타났다.

Key Message
Not only the prevalence but also socioeconomic inequality in adolescent obesity increased between 2006 and 2020. The potential impact of socioeconomic disparity on obesity was greater in girls and middle school students than their counterparts.

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A Scoping Review of the Social Determinants of Pediatric and Adolescent Obesity
Deepali K. Ernest, Elizabeth A. Onugha, Bipin Singh, Shreela V. Sharma, Jayna M. Dave, Samuel Menahem
International Journal of Pediatrics.2025;[Epub] CrossRef
The Association Between Obesity Measures and Metabolic Syndrome Risk in Korean Adolescents Aged 10–18 Years
Munku Song, Seamon Kang, Hyunsik Kang
Journal of Multidisciplinary Healthcare.2024; Volume 17: 1769. CrossRef
Perceived Familial Financial Insecurity and Obesity Among Korean Adolescents During the COVID-19 Pandemic
Fumie Kaneko, Eunji Kim, Hokyou Lee, Kokoro Shirai, Ryo Kawasaki, Hyeon Chang Kim
Journal of Epidemiology.2024; 34(12): 587. CrossRef
Obesity-related behaviors and health-related quality of life in socioeconomically vulnerable children: A cross-sectional study
Jiyoung Park, Gill ten Hoor, Jeonghyun Cho, Seohyun Won, Soorack Ryu, Siew Tiang Lau
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A Comparison of Changes in Health Behavior, Obesity, and Mental Health of Korean Adolescents Before and During the COVID-19 Pandemic: Online Cross-Sectional Study
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COVID-19: Special Article

Changes in health behaviors and obesity of Korean adolescents before and during the COVID-19 pandemic: a special report using the Korea Youth Risk Behavior Survey: Chang-Mo Oh, Yangha Kim, Jieun Yang, Sunhye Choi, Kyungwon Oh; Epidemiol Health. 2023;45:e2023018. Published online February 14, 2023; DOI: https://doi.org/10.4178/epih.e2023018

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
This study aimed to investigate changes in health behaviors, including cigarette smoking, alcohol drinking, physical activity, dietary behaviors, and obesity, before and during the coronavirus disease 2019 (COVID-19) pandemic using the Korea Youth Risk Behavior Survey (KYRBS) database.

METHODS

KYRBS data from 2015 to 2021 were used in this study. Differences in health behaviors between before (pre-pandemic period: 2018-2019) and during (pandemic period: 2020-2021) the pandemic were examined. Differences were compared using linear regression and the chi-square test considering the complex survey design after adjusting for grade level.

RESULTS

The prevalence of current cigarette smoking and current alcohol drinking significantly decreased in both male and female students during the pandemic compared to the pre-pandemic period. However, the prevalence of obesity significantly increased in both male and female students during the same period. When examining physical activity and dietary behaviors closely related to obesity, fast food consumption increased and fruit consumption decreased during the pandemic in both male and female students, whereas no significant changes in physical activity were observed in either male or female students.

CONCLUSIONS

The deterioration of adolescent dietary behaviors and an increase in the prevalence of obesity can increase the future disease burden, and concerted efforts at the individual and national levels are needed to reduce obesity and promote healthy dietary behaviors.

Summary

Korean summary
이 연구는 한국 청소년건강행태조사자료(KYRBS)를 사용하여 코로나19 유행 전후의 우리나라 청소년들의 흡연, 음주, 신체활동, 식습관, 비만 등의 건강행태의 변화에 대하여 살펴보고자 하였다. 이 연구에서는 2015년부터 2021년까지의 청소년건강행태조사자료를 사용하여, 코로나19 유행 이전 (2018-2019년)과 코로나 유행 이후 (2020-2021년) 기간의 건강행태의 변화에 대하여 조사하였다. 학년레벨을 보정한 후, 복합표본설계를 고려하여 로지스틱 회귀분석과 카이제곱검정을 이용하여 코로나19 유행 이전 (2018-2019년)과 비교하여, 코로나 유행 이후 (2020-2021년) 기간의 건강행태의 변화가 있었는지에 대하여 확인하였다. 그 결과, 코로나19 유행 이전 (2018-2019년)과 비교하여, 코로나19 유행 기간(2020-2021년) 동안에 현재흡연율과 현재음주율이 유의하게 감소하였다. 그러나 동일한 기간 동안에 남학생과 여학생 모두에서 비만율이 유의하게 증가하였는데, 비만율과 관련된 신체활동 및 식습관에 대하여 살펴보았을 때, 신체활동에서는 유의한 변화가 없었던 반면, 남학생과 여학생 모두에서 패스트푸드 섭취는 증가하고 과일섭취가 감소한 것으로 나타났다. 따라서 코로나19 유행기간 동안 흡연율 및 음주율 등의 청소년 건강에 유익한 변화도 있었으나, 비만율도 같이 증가한 것을 확인할 수 있었다. 청소년기의 식습관의 악화 및 비만율의 증가는 미래 우리나라의 질병부담을 증가시킬 수 있기 때문에, 청소년의 비만율을 낮추고 건강한 식습관을 증진시키기 위한 개인 및 사회 차원의 노력이 필요하다.

Key Message
-The current cigarette smoking and current alcohol drinking rates significantly decreased among Korean adolescents during the pandemic period compared to the pre-pandemic period. -On the other hand, the obesity rate increased significantly especially among Korean male adolescents, which is accompanied by changes in dietary habits such as an increase in fast food intake and a decrease in fruit intake.

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Wonyoung Jung, Seung-Won Oh, Se-Hong Kim, Soo Young Kim
Korean Journal of Family Medicine.2025; 46(1): 20. CrossRef
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Chaeeun Kim, Haeun Lee, Kyunghee Jung-Choi, Hyesook Park
Journal of Preventive Medicine and Public Health.2024; 57(1): 18. CrossRef
Effects of changes in daily life attributed to COVID-19 on allergic diseases among Korean adolescents
Miso Park, Mi Ah Han, Jong Park, Seong Woo Choi
Journal of Asthma.2024; 61(11): 1545. CrossRef
Exploring Disparities for Obesity in Korea Using Hierarchical Age-Period-Cohort Analysis With Cross-Classified Random Effect Models
Chang Kyun Choi, Jung-Ho Yang, Sun-Seog Kweon, Min-Ho Shin
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Association of parental depression with adolescent children’s psychological well-being and health behaviors
Sung-In Kim, Sung Min Kim, Sun Jae Park, Jihun Song, Jaewon Lee, Kyae Hyung Kim, Sang Min Park
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Original Articles

Long-term association of pericardial adipose tissue with incident diabetes and prediabetes: the Coronary Artery Risk Development in Young Adults Study: Minsuk Oh, Wonhee Cho, Dong Hoon Lee, Kara M. Whitaker, Pamela J. Schreiner, James G. Terry, Joon Young Kim; Epidemiol Health. 2023;45:e2023001. Published online December 3, 2022; DOI: https://doi.org/10.4178/epih.e2023001

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
We examined whether pericardial adipose tissue (PAT) is predictive of prediabetes and type 2 diabetes over time.
METHODS
In total, 2,570 adults without prediabetes/diabetes from the Coronary Artery Risk Development in Young Adults Study were followed up over 15 years. PAT volume was measured by computed tomography scans, and the new onset of prediabetes/diabetes was examined 5 years, 10 years, and 15 years after the PAT measurements. Multivariable Cox regression models were used to examine the association between the tertile of PAT and incident prediabetes/diabetes up to 15 years later. The predictive ability of PAT (vs. waist circumference [WC], body mass index [BMI], waist-to-height ratio [WHtR]) for prediabetes/diabetes was examined by comparing the area under the receiver operating characteristic curve (AUC).
RESULTS
The highest tertile of PAT was associated with a 1.56 times (95% confidence interval [CI], 1.03 to 2.34) higher rate of diabetes than the lowest tertile; however, no association was found between the highest tertile of PAT and prediabetes in the fully adjusted models, including additional adjustment for BMI or WC. In the fully adjusted models, the AUCs of WC, BMI, WHtR, and PAT for predicting diabetes were not significantly different, whereas the AUC of WC for predicting prediabetes was higher than that of PAT.
CONCLUSIONS
PAT may be a significant predictor of hyperglycemia, but this association might depend on the effect of BMI or WC. Additional work is warranted to examine whether novel adiposity indicators can suggest advanced and optimal information to supplement the established diagnosis for prediabetes/diabetes.; Summary

Korean summary
본 연구는 심장 내 축적되는 내장지방과 5년에서 15년 뒤의 당뇨병 전조 단계 및 당뇨병의 발생률과 연관성이 있음을 제안한다. 또한, 본 연구는 심장 내 내장지방과 당뇨병 발생률의 관계는 체질량 지수 또는 허리둘레의 영향에 따라 상이할 수 있음을 제안한다.

Key Message
Pericardial adipose tissue may be a significant predictor of future hyperglycemia in adults, but this association might depend on the effect of body mass index or waist circumference.

Positive association of unhealthy plant-based diets with the incidence of abdominal obesity in Korea: a comparison of baseline, most recent, and cumulative average diets: Sukyoung Jung, Sohyun Park; Epidemiol Health. 2022;44:e2022063. Published online August 2, 2022; DOI: https://doi.org/10.4178/epih.e2022063

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
Different approaches for analyzing repeated dietary measurements may yield differences in the magnitude and interpretation of findings. We aimed to compare 3 dietary measurements (baseline, most recent, and cumulative average) in terms of the association between plant-based diet indices (PDIs) and incident abdominal obesity in Korean adults aged 40-69 years.

METHODS

This study included 6,054 participants (54% women) free of abdominal obesity (defined as waist circumference ≥90 cm for men and ≥85 cm for women) at baseline. As exposures, baseline, most recent, and cumulative average measurements for PDI, healthy-PDI (hPDI), and unhealthy-PDI (uPDI) were created. A Cox proportional-hazard model was used to estimate the hazard ratios (HRs) for abdominal obesity.

RESULTS

During 45,818 person-years of follow-up (median, 9 years), we identified 1,778 incident cases of abdominal obesity. In the multivariable-adjusted analysis, a higher uPDI was associated with a higher risk of abdominal obesity in both total and stratified analyses. The findings were consistent across all approaches (Q5 vs. Q1: HRbaseline=1.70; 95% confidence interval [CI], 1.46 to 1.98; HRmost recent=1.52; 95% CI, 1.30 to 1.78; HRcumulative average=1.76; 95% CI, 1.51 to 2.06 in the total set). PDI showed no meaningful association with abdominal obesity risk in any analyses. hPDIaverage had a suggestive inverse association with abdominal obesity risk in men, and hPDIbaseline had a positive association with abdominal obesity risk in women.

CONCLUSIONS

Greater adherence to unhealthy plant-based diets may increase the risk of developing abdominal obesity in Korean adults. The findings were generally consistent across all approaches.

Summary

Korean summary
본 연구는 한국인 유전체역학조사사업의 안성안산코호트 조사에 참여한 40-69세 한국 성인 6,054명을 대상으로 식물성 기반의 식이 지수와 복부비만 간 연관성이 식이 노출 기간(기반, 최근, 누적 노출)에 따라 어떻게 다른지 비교 분석하였다. 건강하지 않은 식물성 기반의 식이 지수 점수가 높을수록 복부비만 발생 위험이 증가하였고, 식이 노출 기간에 관계없이 일관된 결과를 보였다. 식물성 기반의 식이가 반드시 건강에 유익한 것은 아니며, 정제된 곡물, 탄산음료, 사탕 등 간식류를 많이 먹는 식이 패턴은 식물성 기반 식이라 할지라도 복부비만 위험을 증가시킬 수 있으므로 주의가 필요하다.

Key Message
Unhealthy plant-based diets, including refined grains, sugar-sweetened beverages, sweets and desserts, and salty plant foods, can have a negative effect on abdominal obesity in Korean adults regardless of its exposure duration.

Citations

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Plant‐based and sustainable diet: A systematic review of its impact on obesity
Sara P. Mambrini, Claudia Penzavecchia, Francesca Menichetti, Andrea Foppiani, Alessandro Leone, Marta Pellizzari, Federica Sileo, Alberto Battezzati, Simona Bertoli, Ramona De Amicis
Obesity Reviews.2025;[Epub] CrossRef
Plant-based diets and the gut microbiome: findings from the Baltimore Longitudinal Study of Aging
Xinyi Shen, Curtis Tilves, Hyunju Kim, Toshiko Tanaka, Adam P Spira, Chee W Chia, Sameera A. Talegawkar, Luigi Ferrucci, Noel T Mueller
The American Journal of Clinical Nutrition.2024; 119(3): 628. CrossRef
Association between plant-based diets and risk of metabolic dysfunction–associated steatotic liver disease in Korean adults: A prospective cohort study
Bayarmaa Nasan Ulzii, Kyungjoon Lim, Sangah Shin
Nutrition.2024; 128: 112579. CrossRef
Adherence to the nutritional recommendations according to diabetes status in Korean adults: a cross-sectional study
Jong Han Choi, Chen Lulu, Seon-Joo Park, Hae-Jeung Lee
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Scoping review of the association of plant-based diet quality with health outcomes
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Differences in accuracy of height, weight, and body mass index between self-reported and measured using the 2018 Korea Community Health Survey data: Yoonsil Ko, Sunhye Choi, Jisoo Won, Yeon-Kyeng Lee, Dong-Hyun Kim, Seon Kui Lee; Epidemiol Health. 2022;44:e2022024. Published online February 19, 2022; DOI: https://doi.org/10.4178/epih.e2022024

15,534 View
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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
This study aimed to determine an effective survey method for the accurate calculation of obesity prevalence by comparing the self-reported and measured height, weight, and body mass index (BMI) using the 2018 Korea Community Healthy Survey (CHS) data.

METHODS

Raw data from the 2018 CHS were used to analyze the differences, correlation, and agreement between self-reported and measured height, weight, and BMI.

RESULTS

The self-reported height was over-reported than the measured height (0.59 cm greater for men and 0.71 cm greater for women), while the self-reported weight was under-reported than the measured weight (0.55 kg less for men and 0.67 kg less for women). Subsequently, the self-reported BMI was under-estimated (0.35 kg/m2 lower for men and 0.49 kg/m2 lower for women) compared with the measured BMI. The kappa statistic and agreement between measured and self-reported values per BMI category (underweight, normal, overweight, and obesity) were 0.82 and 79.6%, respectively.

CONCLUSIONS

The prevalence of obesity should be calculated using the measured values provided in the CHS in order to promote local health projects based on accurate evidence.

Summary

Korean summary
본 연구는 2018년 지역사회건강조사 원시자료를 이용하여, 자가보고된 신장, 체중, 그리고 체질량지수 값과 실제 측정한 값 간에 차이를 분석하고 상관성과 일치도를 확인하고자 하였으며, 확인결과 자가보고값 체질량지수는 측정값보다 과소측정(남자의 경우 측정값보다 자가보고값이 0.35kg/m2 낮게, 여자는 0.49kg/m2 낮게 측정)된것을 확인하였다.

Key Message
This study aimed to determine an effective survey method for the accurate calculation of obesity prevalence by comparing the self-reported and measured height, weight, and body mass index (BMI) using the 2018 Community Healthy Survey (CHS) data.

Citations

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Methods

Development and validation of the Pediatric-Youth Hyperphagia Assessment for Prader-Willi syndrome: Sung Yoon Cho, Danbee Kang, Minji Im, Aram Yang, Min-Sun Kim, Jiyeon Kim, Eu-Seon Noh, Eun Kyung Kwon, Eujin Choi, Sunju Han, Young Ah Park, Min Jung Kwak, Youngha Kim, Juhee Cho, Dong-Kyu Jin; Epidemiol Health. 2022;44:e2022014. Published online January 10, 2022; DOI: https://doi.org/10.4178/epih.e2022014

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Abstract Summary PDF

Abstract

OBJECTIVES
Hyperphagia is a highly stressful, life-threatening feature of Prader-Willi syndrome (PWS). It is important to assess this complex behavior accurately over time. This study aimed to develop and validate the Pediatric-Youth Hyperphagia Assessment for Prader-Willi syndrome (PYHAP) as a tool targeting children and adolescents.

METHODS

After an extensive literature review and qualitative interviews, the final version of the PYHAP with 14 questions in 3 domains (verbal [5], behavior [4], and social [5]) was developed and tested at Samsung Medical Center in Seoul, Korea from July 2018 to September 2019. Exploratory factor analysis and confirmatory factor analysis (CFA) were performed to confirm construct validity. The correlations between the PYHAP and the Korean Children’s Eating Behavior Questionnaire (K-CEBQ) were calculated to evaluate convergent and discriminant validity. Criterion validity and the validity of the response categories were also tested.

RESULTS

Cronbach’s alpha coefficient of the PYHAP was 0.91. The fit indices for CFA were good (comparative fit index, 0.87; standardized root mean squared residual, 0.08). The domains of the PYHAP were closely correlated with the relevant domains of the K-CEBQ. The accuracy of the PYHAP score for predicting uncontrolled hyperphagia was good (area under the curve, 0.75; 95% confidence interval, 0.65 to 0.85).

CONCLUSIONS

The PYHAP was confirmed to be a reliable and valid tool to evaluate hyperphagia in children and adolescents with PWS via caregivers’ assessments. It is recommended to use the PYHAP to communicate with parents or caregivers about patients’ hyperphagia or to monitor and manage extreme behaviors in children with PWS.

Summary

Korean summary
프래더 윌리 증후군에서 '조절되지 않는 식욕'은 환자의 수명과 삶의 질에 매우 중요한 문제로, 최근 식욕 억제제 개발을 위한 연구가 활발히 이뤄지고 있으나 약제의 유효성을 객관적으로 평가하는 도구는 부족한 상황입니다. 본 연구는 주부양자를 통하여 평가가 가능한 프래더윌리 증후군 소아청소년 환자들의 식욕심각도 평가도구를 개발하였고, 그것의 신뢰성과 타당성을 입증하였습니다.

Key Message
Pediatric-Youth Hyperphagia Assessment for Prader-Willi syndrome (PYHAP) is a reliable and valid tool to evaluate hyperphagia in children and adolescents with PWS via caregivers’ assessments.

Citations

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