Epidemiology and Health

Original Article

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

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/m<sup>2</sup> 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

Citations to this article as recorded by

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;[Epub] CrossRef
A Systematized Review of the Relationship Between Obesity and Vitamin C Requirements
Julia K. Bird, Edith J.M. Feskens, Alida Melse-Boonstra
Current Developments in Nutrition.2024; : 102152. CrossRef

Cohort Profile

The Dehgolan Prospective Cohort Study (DehPCS) on non-communicable diseases in a Kurdish community in the west of Iran: Farhad Moradpour, Ebrahim Ghaderi, Ghobad Moradi, Mojdeh Zarei, Amjad Mohamadi Bolbanabad, Bakhtiar Piroozi, Azad Shokri; Epidemiol Health. 2021;43:e2021075. Published online October 1, 2021; DOI: https://doi.org/10.4178/epih.e2021075

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Abstract

The Dehgolan Prospective Cohort Study (DehPCS) was conducted to examine and identify risk factors for the most prevalent non-communicable diseases (NCDs). In addition, in order to examine participants’ health status, socioeconomic status, behavioral factors, nutritional status, and environmental exposures, the DehPCS collected, analyzed, and stored blood, urine, nail, and hair samples to conduct genetic studies and identify biomarkers and other biological determinants of NCDs. In total, 3,996 adults aged 35 to 70 from the general population participated in the study from February 2018 to March 2019. Of them, 43.7% were women. The first follow-up wave was conducted with 3,995 participants. Information on a wide range of variables was collected, including on socioeconomic status, lifestyle, nutritional status, habits, physical examination findings, medication use, and medical history. Proxy variables such as body mass index, metabolic equivalent task score, wealth index, and macronutrients and micronutrients were calculated. The most common self-reported diseases in descending order were kidney stones, hypertension, and fatty liver. The prevalence of diabetes and hypertension was 9.3% and 33.4%, respectively. All data, samples, and measurements will be collected again at 5-year intervals. Thus, it will be possible to examine time-dependent changes in the risk factors of NCDs. The DehPCS can be used to study the relationships among genetics, lifestyle, socioeconomic status, and environmental risk factors and the most prevalent NCDs in case-cohort studies using a nested case-control design that will be applied to the cohort infrastructure. Researchers can also submit pre-proposals via the following web address: http://c.ddrc.ac.ir/persianaccess/Account/Login.

Summary

Key Message
• The DehPCS was designed to examine NCDs among the Kurdish population, who are located in a wide area between the northwest of the Zagros Mountains and the eastern Taurus Mountains covering Turkey, Iraq, Iran, and Syria. • In total, 3,996 adults aged 35 to 70 from the general population participated in the study. • All data, samples, and measurements from the registration phase will be collected again at 5-, 10-, and 15-year intervals. • After labeling, aliquots were placed in a freezer at -70°C to enable ongoing studies of the samples in the future.

Citations

Citations to this article as recorded by

Validity of self‐reported hypertension and related factors in the adult population: Preliminary results from the cohort in the west of Iran
Negar Piri, Yousef Moradi, Reza Ghanei Gheshlagh, Mahsa Abdullahi, Eghbal Fattahi, Farhad Moradpour
The Journal of Clinical Hypertension.2023; 25(2): 146. CrossRef
The association between nutrients and occurrence of COVID‐19 outcomes in the population of Western Iran: A cohort study
Dana Vaisi, Farhad Moradpour, Shadieh Mohammadi, Daem Roshani, Yousef Moradi
The Clinical Respiratory Journal.2023; 17(6): 589. CrossRef
Prevalence of metabolic syndrome and its association with oral health: First results from the Kurdish cohort study
Farhad Moradpour, Zahra Karimi, Zeinab Fatemi, Yousef Moradi, Mohammad Rastegar Khosravi, Azad Shokri, Mohammad Karimzadeh
Health Science Reports.2023;[Epub] CrossRef
Socioeconomic inequalities in metabolic syndrome and its components in a sample of Iranian Kurdish adults
Pardis Mohammadzadeh, Farhad Moradpour, Bijan Nouri, Farideh Mostafavi, Farid Najafi, Ghobad Moradi
Epidemiology and Health.2023; 45: e2023083. CrossRef
Socio-demographic correlates of diabetes self-reporting validity: a study on the adult Kurdish population
Farhad Moradpour, Negar Piri, Hojat Dehghanbanadaki, Ghobad Moradi, Mahdiyeh Fotouk-Kiai, Yousef Moradi
BMC Endocrine Disorders.2022;[Epub] CrossRef
Prevalence of prediabetes, diabetes, diabetes awareness, treatment, and its socioeconomic inequality in west of Iran
Farhad Moradpour, Satar Rezaei, Bakhtiar Piroozi, Ghobad Moradi, Yousef Moradi, Negar Piri, Azad Shokri
Scientific Reports.2022;[Epub] CrossRef

Original Articles

Examples and outlook of family-based cohort study.: Jae Woong Sull, Sue Kyung Park, Heechoul Ohrr, Sun Ha Jee; Korean J Epidemiol. 2008;30(1):49-59. Published online June 30, 2008; DOI: https://doi.org/10.4178/kje.2008.30.1.49

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Abstract PDF: Abstract
Family-based designs are commonly used in genetic association studies to identify and to locate genes that underlie complex diseases. In this paper, we review two examples of genome-wide association studies using family-based cohort studies, including the Framingham Heart Study and International Multi-Center ADHD Genetics Project. We also review statistical methods of family-based designs, including the transmission disequilibrium test (TDT), linkage analysis, and imprinting effect analysis. In addition, we evaluate the strengths and limitations of the family-based cohort design. Despite the costs and difficulties in carrying out this type of study, a family-based cohort study can play avery important role in genome wide studies. First, the design will be free from biases due to population heterogeneity or stratification. Moreover, family-based designs provide the opportunity to conduct joint tests of linkage and association. Finally, family-based designs also allow access to epigenetic phenomena like imprinting. The family-based cohort design should be given careful consideration in planning new studies for genome-wide strategies.; Summary

Current Status of Multicenter Cancer Cohort Study with Biological Materials Bank in Korea.: Keun Young Yoo, Hai Rim Shin, Song Hun Chang, Jung Myung Choi, Chang Yup Kim, Kun Sei Lee, Won Jin Lee, Dae Hee Kang, Bu Ok Lee, Duck Hee Lee, Sue Kyung Park, Joo Hon Sung, Yeong Su Ju, Dae Sung Kim, Jong Won Kang, Soo Hun Cho; Korean J Epidemiol. 1998;20(2):275-278.

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Abstract PDF: Abstract
This cohort study is a collaborative effort of 8 institutions. The goal is to establish a large scale cohort that can be followed for 10 or more years to assess the relationship between life-styles and cancer occurrence, and to evaluate the role of environmental exposures in the development of six major sites of cancers(stomach, liver, lung, colorectum, uterine cervix and female breast) in the rural population. Since 1993, 11,304 men and women aged over 35 living in four areas have been recruited. The number of target population is 30,000 persons, which is expected to be successfully recruited until 1999. Each subject has completed a detailed questionnaire on general life-styles, reproductive factors, and agricultural chemical exposures through the interview. Anthropometric measurements with body fat composition and the routine clinical laboratories were examined. For the cancer-free cohort, physical examination by the physicians and serologic tests for hepatitis markers, some tumor markers, and lipid profile have been done, but not all. In order to provide an opportunity to incorporate barious biomarkers of exposure and effect as well as genetic susceptibility, a biologic tissue bank has been established from blood and urine sample(plasma, WBC buffy-coat, RBC clots, and urine supernatant) stored at-70degrees C. Re-examination of changes in exposere to risk factors will be done periodically. Disease occurrence will be ascertained by the active(mainly through diagnosis by physicians) and the passive surveillance(through both death certificate and screening of medical utilization records).; Summary

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