Association between Parent’s Metabolic Syndrome and 12- to18-Year-Old Offspring’s Overweight: Results from the Korea National Health and Nutrition Examination Survey (K-NHANES) 2009–2016

Lee, Na Yeong; Han, Kyungdo; Lee, Yoonji; Kim, Seulki; Lee, Seonhwa; Choi, Yujung; Ahn, Moon bae; Kim, Shin Hee; Cho, Won Kyoung; Cho, Kyoung Soon; Jung, Min Ho; Park, Yong-Gyu; Suh, Byung-Kyu

doi:https://doi.org/10.1155/2020/8737912

International Journal of Endocrinology

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Research Article | Open Access

Volume 2020 | Article ID 8737912 | https://doi.org/10.1155/2020/8737912

Association between Parent’s Metabolic Syndrome and 12- to18-Year-Old Offspring’s Overweight: Results from the Korea National Health and Nutrition Examination Survey (K-NHANES) 2009–2016

Na Yeong Lee,¹Kyungdo Han,²Yoonji Lee,¹Seulki Kim,³Seonhwa Lee,⁴Yujung Choi,⁴Moon bae Ahn,¹Shin Hee Kim,⁵Won Kyoung Cho,⁶Kyoung Soon Cho,⁷Min Ho Jung,⁴and Yong-Gyu Park² et al.

Academic Editor: Silvia Monticone

Received18 Dec 2019

Revised14 Jun 2020

Accepted16 Oct 2020

Published31 Oct 2020

Abstract

Background. Little information is available on the association between parents’ metabolic syndrome (MetS) and adolescent offspring’s obesity in Korea. The aim of our study is to determine the association between parent’s metabolic syndrome and offspring’s obesity. Methods. The study data were obtained from the Korean National Health and Nutrition Examination Survey conducted during 2009–2016. In the present study, 3140 adolescents aged 12 to 18 years, their paternal pairs (PP, fathers = 2244), and maternal pairs (MP, mothers = 3022) were analyzed. Of these 3140 adolescents, 2637 had normal weight {age- and sex-specific body mass index (BMI) under the 85^th percentile}, whereas 467 were overweight (age- and sex-specific BMI over the 85^th percentile). Results. Offspring’s overweight and central obesity were associated with all components of the PP’s metabolic risk factors, including central obesity (), systolic () and diastolic blood pressure (), glucose intolerance (), and triglyceride () and high-density lipoprotein levels (). In addition, offspring’s overweight and central obesity were also associated with the metabolic risk factors of MP, including central obesity (), systolic () and diastolic blood pressure (), glucose intolerance (), and triglyceride levels (). In multivariate logistic regression analysis, offspring’s overweight was significantly and positively associated with parental central obesity (PP, adjusted odds ratio (OR) = 1.593; 95% confidence interval (CI): 1.192–2.128; MP, adjusted OR = 2.221, 95% CI: 1.755–2.812) and parental metabolic syndrome (PP, adjusted OR = 2.032; 95% CI: 1.451–2.846; MP, adjusted OR = 2.972, 95% CI: 2.239–3.964). As the number of parental metabolic risk factors increased, offspring’s risk for overweight and central obesity increased ( for trends < 0.001). Conclusion. Parental metabolic syndrome was associated with obesity in 12- to 18-year-old offspring in Korea.

1. Introduction

Worldwide trends in obesity in children and adolescents have increased over the past three decades [1]. The same trends were found in Korea, showing that childhood obesity increased from 6.8% in 1998 to 10% in 2013 [2]. A systematic analysis published at 2013 reported that 23.8% of boys and 22.6% of girls were overweight or obese in developed countries [3]. In Korea, 18.4% of boys and 17.5% of girls aged 2 to 19 years were classified as overweight (BMI > 85^th percentile) from 2010 to 2012, based on the 2007 Child Growth Chart of Korea [4]. It is widely accepted that overweight and obese children and adolescents are at high risk for developing hypertension, impaired fasting blood glucose, dyslipidemia, and metabolic syndrome (MetS) [5]. Some studies have shown an association between weight status and metabolic comorbidity in children [6, 7]. Therefore, identifying children at higher risk of obesity and metabolic syndrome is very important for proper intervention, such as lifestyle modification.

Parents influence their children both genetically and environmentally. Several studies have reported familial aggregations of obesity [8] and metabolic syndrome among siblings [9, 10] and between parents and offspring [11–13]. However, previous studies mainly reported the association between parents and offspring’s MetS or the association between parents and offspring’s obesity. Few studies have focused on the effect of parental MetS on offspring’s overweight or obesity. Thus, the aim of our study was to determine the association between parental MetS and offspring’s obesity and identify which metabolic factors in the parents had the most powerful effect on offspring obesity. We also examined that the number of metabolic risk factors was associated with increased risk of offspring’s obesity.

2. Methods

2.1. Data

The study data were obtained from the Korea National Health and Nutrition Examination Surveys (K-NHANES) conducted from 2009 to 2016 by the Korean Ministry of Health and Welfare. K-NHANES is a cross-sectional survey based on stratified multistage probability samples of Korean households representing the noninstitutionalized civilian population. The selection process for the survey is as follows. After a survey area was selected by sample design, households under investigation were extracted considering survey area border and appropriate number of households. This is an annual surveillance system which collects information about the survey subjects’ demographic, social, health, and nutritional status through the following components surveys using representative country samples: a medical examination, a health interview survey, and a nutrition survey. K-NHANES data are publicly available without charge. [14]. The Institutional Review Board of the Catholic University of Korea approved this study (VC19ZASI0295).

2.2. Selection of Study Populations

In the present study, 3140 adolescents (1628 males and 1512 females) aged 12–18 years, their paternal pairs (PP, fathers = 2244), and maternal pairs (MP, mothers = 3022) were analyzed. Of these 3140 adolescents, 2673 had normal weight (NW, age- and sex-specific BMI under the 85^th percentile), whereas 467 were overweight (OW, age- and sex-specific BMI over the 85^th percentile) [15].

2.3. Anthropometric and Laboratory Measurements

Height was measured using a stadiometer (Seca, Hamburg, Germany). Weight was measured with a balance-beam scale (GL-6000-20, CASKOREA, Korea) with the participants wearing a standard gown. Waist circumference (WC) was measured to the nearest 0.1 cm at the end of normal expiration, measuring from the narrowest point between the midline of the most lateral border of the right and left iliac crest. Fasting plasma of glucose concentrations (n = 2854), glycosylated hemoglobin (HbA1C) (n = 1619), total cholesterol (TC, n = 2862), triglyceride (TG, n = 2862), high-density lipoprotein-cholesterol (HDL-C, n = 2862), and low-density lipoprotein-cholesterol (LDL-C, n = 2862) levels in the subjects were measured enzymatically using a Hitachi 747 chemistry analyzer (Daiichi, Tokyo, Japan) after the subjects fasted a minimum of eight hours overnight. Blood pressure (BP) was calculated as the mean of three successive readings using a standard Mercury sphygmomanometer (Baumanometer). Average sleep time (ST), walking time (WT, the percentage of people who walked for 30 minutes at least five days a week), and low income (LI, income lower than the 25^th percentile) were also determined [14].

2.4. Definitions of Abnormal Metabolic Risk Factors

The definition of parental MetS was adapted from the International Diabetes Federation’s (IDF): central obesity was defined as waist circumference ≥ 90 cm in men and ≥80 cm in women; HDL-C <40 mg/dL in men and <50 mg/dL in women or specific treatment for a lipid abnormality; TG ≥ 150 mg/Dl; glucose ≥100 mg/dl; systolic blood pressure (SBP) ≥130 mmHg, and diastolic blood pressure (DBP) ≥85 mmHg. Based on the IDF definition for MetS, an individual should have central obesity plus any two of the other four components [16]. We used standard cutoff values of the criteria for abnormal metabolic risk factors in offspring as follows: central obesity (waist circumference ≥ 90^th percentile in age- and sex-specific criteria for those younger than 16, adult criteria were used for those ≥16 years old), HDL-C<40 mg/dL or <50 mg/dL in girls older than 16 years, TG ≥ 150 mg/dL, glucose ≥100 mg/dL, SBP ≥130 mmHg, and DBP ≥ 85 mmHg [17].

2.5. Potential Confounders

When we collected the potential confounders, first of all, we selected the factors associated obesity and metabolic syndrome and they should be considered clinically. Those were represented by age, gender, exercise, smoking, drinking, sleep time, and diagnostic criteria of metabolic syndrome. Data regarding the duration and frequency of subjects in walking, smoking, and drinking status were collected using a questionnaire in the presence of trained personnel to answer any questions that subjects might have. Items such as smoking and drinking were classified as if the subjects had ever smoked and drunk, and exercise was defined as participating in walking activity for >30 min per day, on more than five days per week. And, we also referenced previous studies about the association of metabolic syndrome [11, 13, 18] and obesity [8] between parents and offspring. In addition, the factors from the statistically significant results of our subjects were also considered.

2.6. Statistical Analysis

All statistical analyses were performed using SAS Version 9.3 (SAS Institute Inc., Cary, USA). Sampling weights were incorporated to produce valid population estimates that accounted for the complex survey design of the K-NHANES. The data are presented as mean ± standard error (SE) for continuous variables and frequency percentage for categorical variables. The characteristics and laboratory data of the body composition groups by sex were compared using ANOVA for continuous measures and chi-squared tests for categorical measures. Multivariate logistic regression models were used to compare the adjusted ORs and 95% CIs of the metabolic risk factors between body composition groups after adjusting for potentially confounding variables.

3. Results

(1)Characteristics and anthropometric data of 12- to 18-year-old adolescents and parents (Table 1). In OW adolescents, weight (), BMI () and WC () were higher than those in NW adolescents. The ST per a day () of OW adolescents was shorter than that of NW adolescents. The mean BMI (), WC (), SBP (), DBP (), fasting glucose (), and TG () in the PP of the OW adolescents were higher than those in the PP of NW adolescents. The mean BMI (), WC (), SBP (), fasting glucose (), and TG () in the MP of OW adolescents were higher than those in the MP of NW adolescents.(2)Correlation between metabolic risk factors of 12- to 18-year-old adolescents with parents (Table 2). The mean BMI of offspring was positively correlated with WC (r = 0.223, ), SBP (r = 0.095, ), DBP (r = 0.093, ), fasting glucose (r = 0.101, ), and TG (r = 0.083, ). However, it was negatively correlated with HDL (r = −0.048, ) of the PP. The mean BMI of the offspring was positively correlated with waist circumference (r = 0.235, ), SBP (r = 0.096, ), DBP (r = 0.067, ), fasting glucose (r = 0.140, ), and TG (r = 0.091, ) of the MP. The mean WC of the offspring was positively correlated with WC (r = 0.244, , SBP (r = 0.075, ), DBP (r = 0.054 ), fasting glucose (r = 0.101, ), and TG (r = 0.079, ). However, it was negatively correlated with the HDL values (r = -0.052, ) of the PP. The mean WC of the offspring was positively correlated with WC (r = 0.261, ), SBP (r = 0.098, ), DBP (r = 0.068, ), fasting glucose (r = 0.122, ), and TG (r = 0.088, ) but negatively correlated with HDL (r = −0.028, ) values of the MP.(3)Multivariate logistic regression analyses of overweight status and central obesity in 12- to 18-year-old adolescents according to metabolic risk factors of their parents (Table 3). The OR of being overweight was significantly increased in adolescents with PP with metabolic risk factors, including central obesity (OR = 1.593, 95% CI: 1.192–2.128), high blood pressure (OR = 1.431, 95% CI: 1.091–1.877), impaired fasting glucose (OR = 1.711, 95% CI: 1.304–2.246), high TG (OR = 1.402, 95% CI: 1.066–1.845), and PP with MetS (OR = 1.651, 95% CI: 1.245–2.190) after adjusting for age, sex, smoking, drinking, exercise, income, and average daily ST of the offspring and smoking, drinking, exercise, income, and average daily ST of the PP. The OR of being overweight in the offspring was significantly increased in those with MP with metabolic risk factors, including central obesity (OR = 2.221, 95% CI: 1.755–2.812), high blood pressure (OR = 1.299, 95% CI: 0.992–1.701), impaired fasting glucose (OR = 1.857, 95% CI: 1.443–2.391), high TG (OR = 1.249, 95% CI: 0.928–1.681), and MP with MetS (OR = 1.706, 95% CI: 1.408–2.212) after adjusting for age, sex, smoking, drinking, exercise, income, and average daily ST of the offspring and smoking, drinking, exercise, income, and average daily ST of the MP. The OR of having central obesity in offspring was significantly increased in PP with metabolic risk factors, including central obesity (OR = 2.032, 95% CI: 1.451–2.846), high blood pressure (OR = 1.618, 95% CI: 1.185–2.210), impaired fasting glucose (OR = 1.561, 95% CI: 1.123–2.710), high TG {OR = 1.426, 95% CI: 1.027–1.981), and PP with MetS (OR = 1.935, 95% CI: 1.397–2.682) after adjusting for age, sex, smoking, drinking, exercise, income, and average daily ST of the offspring and smoking, drinking, exercise, income, and average daily ST of the PP. The OR of having central obesity in offspring was significantly increased in those with MP with metabolic risk factors, including central obesity (OR = 2.979, 95% CI: 2.239–3.964), high blood pressure (OR = 1.326, 95% CI: (0.955–1.841), impaired fasting glucose (OR = 1.927, 95% CI: 1.443–2.590), high TG (OR = 1.279, 95% CI: 0.899–1.820), and MP with MetS (OR = 1.858, 95% CI: 1.361–2.538) after adjusting for age, sex, smoking, drinking, exercise, income, and average daily ST of the offspring and smoking, drinking, exercise, income, and average daily ST of the MP.(4)Multivariate logistic regression analysis of offspring with OW status and central obesity according to the number of metabolic risk factors of their parental pairs (Table 4). As the number of metabolic risk factors in the PP increased, the OR of being OW in the offspring also increased, from 1.537 for only one metabolic risk factor to 2.716 for five metabolic risk factors ( for trends) after adjusting for age, sex, drinking, smoking, exercise, income, and average daily ST of offspring and smoking, drinking, exercise, income, and average daily ST of the PP. Similarly, the number of metabolic risk factors in the MP also influenced the OR of being overweight in the offspring, with the same trends of as that of the PP. The OR increased from 1.102 for one metabolic risk factor to 5.057 for five metabolic risk factors ( for trends) after adjusting for age, sex, drinking, smoking, exercise, income, and average daily ST of offspring and smoking, drinking, exercise, income, and average daily ST of the MP. The OR of central obesity in the offspring was also influenced by the number of parental metabolic risk factors. As the number of metabolic risk factors in the PP increased from 1 to 5, the OR of being central obese in the offspring increased from 1.019 to 2.528 ( for trends) after adjusting for age, sex, drinking, smoking, exercise, income, and average daily ST of offspring and smoking, drinking, exercise, income, and average daily ST of the PP. The number of metabolic risk factors in the MP also influenced the OR of being central obese in the offspring with the same trends. The OR of being central obese in the offspring increased from 1.439 to 6.512 ( for trends) when the number of metabolic risk factor increased from 1 to 5 after adjusting for age, sex, drinking, smoking, exercise, income, and average daily ST of offspring and smoking, drinking, exercise, income, and average daily ST of the MP.

4. Discussion

In this study, we found that the risk of being overweight and central obese in the offspring was considerably associated with parental MetS. In fathers, all five components of MetS were associated with offspring’s BMI and WC. All mother’s metabolic risk factors except HDL were also associated with offspring’s obesity. Among parental metabolic risk factors, WC of both PP and MP had the highest correlation coefficient with offspring’s BMI and WC. The OR of being OW and having central obesity were increased in the offspring with paternal or maternal MetS, respectively. As the number of parental metabolic risk factors increased, the odds ratio of being OW and central obese was also increased.

Several studies reported associations of OW and obesity in offspring [8] with metabolic syndrome [11–13, 19] in parents, although such associations are influenced by sex and age. In our study, we found that the parents of OW adolescents had higher BMIs and WCs than the parents of NW adolescents, which could indicate a familial aggregation of obesity. And, we also found that parental MetS was associated with metabolic risk factors in the offspring. Existing studies have mainly focused on the association of obesity or MetS between parents and offspring. However, we analyzed the parents’ individual MetS factors and confirmed that each factor could affect OW status and central obesity in their offspring. Thus, attention should be paid to children if their parents have metabolic risk factors, even if there is only one risk factor, instead of merely focusing on the children of parents diagnosed with MetS.

Yoo el al. [11] and Lee [12] reported that children had a higher prevalence of MetS if their parents had MetS in South Korea. Regardless of nationality, race, and region, we could find the similar results of studies about the association between parents and offspring in MetS [10, 13, 19, 20]. However, few studies have paid attention to the fact that as the number of parental MetS factor increases, the risk of OW and central obesity also increased in their children. The results of the present study demonstrated a graded effect of the number of parental metabolic risk factors on their adolescent offspring. This suggests the importance of reducing at least one metabolic risk factor in parents to decrease the risk of OW or obese children.

In addition, another important finding in our study that was not noticeable in other studies was the difference of the influence of mother and father to offspring’s obesity. As mentioned before, it showed same trend that as the number of parental metabolic risk factors increases, and offspring’s risk of being obese also increased in both parents. But, there is a distinct difference in the degree of risk that each mother and father have on their child’s obesity; the number of MP’s metabolic risk factors were more potent risk factors to offspring’s obesity.

It is well known that MetS pathophysiology can be explained by glucose metabolic disorders, dyslipidemia, obesity, and hypertension [21]. Central obesity could be an independent predictor of insulin resistance, lipid levels, and blood pressure [22, 23]. Some studies have reported WC might reflect adiposity in children [24]. From this study, we learn that parental MetS, especially, central obesity was a noteworthy factor that might affect weight and central obesity in their offspring. Thus, it is important to check WC, in addition to weight, for monitoring central obesity and preventing progression to diseases associated with obesity, such as cardiovascular disease and type 2 diabetes mellitus (DM).

Children with obesity are more likely to have obesity-related morbidity [25]. Being overweight and having central obesity are not static health problems. They could lead to metabolic syndrome, cardiovascular diseases, and type 2 DM [26] later in life [27–29]. Therefore, it is very important to manage obesity in children and adolescents. The prevention and management of offspring obesity should pay attention to factors identified in this study. From this study, we know which parental metabolic risk factors had the biggest effect on offspring obesity. Thus, we should assess parental metabolic risk and identify children with the potential for developing obesity, so proper interventions, such as diet, exercise, and lifestyle modification, can be applied.

Our study had several limitations. First, this study was a cross-sectional study. We could not follow-up to determine the causality of obesity. Second, this study did not compare the association between spousal or sibling conditions which can help analysis of familial aggregation. However, after correcting factors related parent’s and offspring’s behavior, the relationship between parent’s metabolic syndrome and offspring’s obesity. Therefore, it is assumed that biological mechanism is stronger than environmental effect, but more detailed research is needed in near future. Third, we could not analyze diet as confounder although we recognized that diet could be one of the causes of metabolic syndrome. That is because it did not perform the same type of question about diet during the study periods. We think further research reflects diet as confounder is needed sooner or later. However, in this study, we reported the association between parental MetS and offspring obesity, and parental central obesity was the most powerful single factor affecting offspring obesity. These results suggest that the prevention and management of offspring obesity should consider various aspects, including a powerful parental effect on their children’s health.

Data Availability

The data used to support this study are available at https://knhanes.cdc.go.kr/knhanes/sub04/sub04_03.do?classType=7 (Korea Centers for Disease Control and Prevention and Korean National Health and Nutrition Examination Survey)

Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Copyright © 2020 Na Yeong Lee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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