The Determinants of Adolescent Glycolipid Metabolism Disorder: A Cohort Study

Liang, Xiao-Hua; Xiao, Lun; Chen, Jing-Yu; Qu, Ping; Tang, Xian; Wang, Yuwei

doi:https://doi.org/10.1155/2022/6214785

International Journal of Endocrinology

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Abstract Background Methods Results Discussion Data Availability Consent Disclosure Conflicts of Interest Authors’ Contributions Acknowledgments Supplementary Materials References Copyright Related Articles

Research Article | Open Access

Volume 2022 | Article ID 6214785 | https://doi.org/10.1155/2022/6214785

The Determinants of Adolescent Glycolipid Metabolism Disorder: A Cohort Study

Xiao-Hua Liang,¹Lun Xiao,²Jing-Yu Chen,³Ping Qu,¹Xian Tang,¹and Yuwei Wang⁴

Academic Editor: Faustino R. Perez-Lopez

Received17 Aug 2021

Accepted09 May 2022

Published08 Jun 2022

Abstract

Background. The increased prevalence of glycolipid metabolism disorders (GLMD) in childhood and adolescents has a well-established association with adult type 2 diabetes and cardiovascular diseases; therefore, determinants of GLMD need to be evaluated during this period. Objectives. To explore the prevalence of and risk factors for GLMD from the prenatal period through childhood and adolescence. Methods. A bidirectional cohort study which was established in 2014 and followed between March 1 and July 20, 2019, was used to illustrate the impact factors for GLMD. Stratified cluster sampling in urban-rural areas was used to include subjects from four communities in Chongqing. 2808 healthy children aged between 6 and 9 years in 2014 entered the cohort in 2014 and followed in 2019 with a follow-up rate of 70%. 2,136 samples (aged 11.68 ± 0.60 years) were included. Results. The prevalence rates of insulin resistance (IR), prediabetes/diabetes, and dyslipidemia were 21.02%, 7.19%, and 21.61%, respectively. Subjects with an urban residence, no pubertal development, dyslipidemia in 2014, higher family income, and higher parental education had significantly elevated fasting insulin (FI) or homeostasis model assessment of insulin resistance (HOMA-IR) levels; subjects with female sex, no pubertal development, dyslipidemia in 2014, obesity, gestational hypertension, maternal weight gain above Institute of Medicine guidelines, and single parents had increased triglyceride or triglyceride/high-density lipoprotein (HDL). Adolescents with rural residence had higher HbA1c level. Conclusion. We observed that the prevalence of GLMD was high in childhood and adolescents, and rural-urban areas, sex, pubertal development, dyslipidemia in a younger age, maternal obesity, and hypertension were associated with increased GLMD risk, suggesting that implementing the community-family intervention to improve the GLMD of children is essential.

1. Background

The increased prevalence of glycolipid metabolism disorders (GLMD) in childhood and adolescents has a well-established association with adult type 2 diabetes and cardiovascular diseases (CVDs) [1]. GLMD in adolescents includes insulin resistance (IR), dyslipidemia, and hyperglycemia. The prevalence of IR and dyslipidemia in children and adolescents ranged from 25.3% to 44.3% among children and adolescents according to different regions and different diagnosed criteria [2, 3]. The triglyceride/high-density lipoprotein cholesterol (HDL-C) ratio was used as an IR marker for overweight and obese children [4] and was also an index of GLMD. The prevalence of hyperglycemia ranged from 5.7% to 11.13% among children with obesity [5]. Despite having lower prevalence than IR and dyslipidemia, hyperglycemia during childhood is a predictor of type 2 diabetes in adulthood [6]. Because childhood metabolic disorders can predict CVDs in adulthood [4, 6], determinants of GLMD need to be evaluated during this period. Therefore, it is meaningful to investigate the prevalence and significant risk factors for GLMD during the perinatal, younger childhood, and adolescence periods.

Obesity is the main cause of GLMD, and our previous study revealed that obesity is positively associated with low-density lipoprotein cholesterol (LDL-C) and TGs but negatively correlated with HDL-C [7]. Moreover, previous studies have shown increased prevalence of GLMD in individuals with a sedentary lifestyle, unhealthy dietary habits, genetic factors, exposure to higher maternal fasting blood glucose (FBG) levels in utero [8], and gestational diabetes [9]. A study found that extraverted personality is positively correlated with triglycerides, FBG, and metabolic syndrome (MS) score in adults [10]. However, to our knowledge, there are no studies from the Southwest of China exploring the correlation between multiple risk factors from prenatal to young adolescent and GLMD in children aged 10∼14 years in a rural-urban cohort study. This cohort study included measures of perinatal variables, social economic status (SES), anthropometric variables, and biochemical indexes in 2014 and 2019 in adolescents, providing an excellent opportunity to fully examine the risk factors for GLMD.

2. Methods

2.1. Patient and Public Involvement

The children and their guardians or the public were not involved in the design, conduct, reporting, or dissemination plans of our research.

2.2. Subjects

Subjects were from a two-stage stratified cluster sampling of urban-rural regions of Chongqing; two streets per county were selected, and, at last, all subjects living in the target region were informed and included in the analyses if they satisfied the following criteria [11–14]. Moreover, a bidirectional cohort in which both retrospective and prospective variables were analyzed to evaluate the risk factors of GLMD from the perinatal period through adolescence, as the variables about perinatal risks were collected, and risk factors and physical examination were conducted in 2014 and in 2019 [11]. Children who had all the following criteria were included: (1) age between six and nine years in 2014, (2) residing in the chosen area for >6 months, (3) did not have severe diseases (e.g., nephropathy, CVD, or cancer), and [15] consent for participation from both the parents and children. The information about SES and family health history questionnaires were collected by a structured questionnaire. The questionnaires were administered and collected by the teachers, and the physical measures results were disseminated also by the teachers. Finally, 2136 participants (with a follow-up rate of 70%) were ultimately included (Figure 1) and the difference between children with follow-up and withdrawal is compared in Supplementary eTable 1.

2.3. Demographic Variables

Demographic information and SES (parental occupation, education level, household income, and parent’s marriage status) were collected [7, 11, 12, 16, 17]. The education level of parents was measured on a four-point scale (≤9 years (primary and middle school), 9∼12, 12∼15, and >15 years), and we combined bachelor and master’s degrees as there were few parents with master’s degrees. Prenatal variables included maternal preconception obesity, increased body mass index of mother during pregnancy, birth with Cesarean section, premature delivery (<37 weeks), birthweight, breast-feeding, gestational hypertension (GH), and gestational diabetes. Family history of obesity and CVD was investigated. The degree of pubertal development was surveyed by the visit of pediatrician and children or parents filling the questionnaires, which included the date of the first menstruation and first nocturnal emission, and then the age was calculated.

2.4. Physical Examination

Anthropometric indexes were measured by standard-trained pediatric nurses and medical students, and the protocol was detailedly described in our previous papers [11, 14, 18–20]. Anthropometric indexes included height, weight, waist circumference, waist-height ratio (WHtR = waist circumference/height), hip circumference, and blood pressure (BP) [14].

2.5. Biochemical Indexes

Venous blood (3 ml) was drawn in the morning after at least 12 hours of fasting from each of the participants who gave informed consents. The biochemical indexes and glycosylated hemoglobin were measured within two hours after venous blood was drawn, which was introduced by several publicized papers [11, 14, 21–23]. Moreover, the ratio of TG/HDL-C was used as a parameter to assess lipid metabolism [4]. Siemens Centaur XP was used to measure fasting insulin (FI), and HbA1c was measured by an automatic hemoglobin analyzer (ARKRAY, Japan).

2.6. Diagnostic Criteria

Children were considered to have prediabetes/diabetes if they met at least one of the following criteria: FBG ≥5.6 mmol/L or HbA1c level ≥5.7% [24], and high lipids were defined if adolescents met one of the following criteria [25]: total cholesterol (TC) ≥200 mg/dL, TG ≥ 130 mg/dL, LDL-C ≥ 130 mg/dL, or HDL-C ≤ 40 mg/dL. Moreover, IR was indicated by HOMA-IR > 3.0 based on the criteria from China [2]; HOMA-IR was calculated as (FI mU/L) × (FBG mmol/L)/22.5. Overweight and obesity were diagnosed by a body mass index (BMI) ≥ P₈₅ and <P₉₅ and BMI ≥ P₉₅, respectively, according to the sex-specific Centers for Disease Control BMI-for-age growth charts [26]. Global reference of size for gestational age was used for the diagnosis for large for gestational age (LGA) or small for gestational age (SGA) [27]: birthweight ≥ P₉₀ indicated LGA, and birthweight < P₁₀ indicated SGA [28], using the mean birthweight of 3,332.93 g and a variation coefficient of 14.36% at 40.5 weeks. Maternal overweight and obesity were indicated by a BMI of 24∼27.9 kg/m² and a BMI ≥ 28 kg/m², respectively; BMI < 18.5 kg/m² was defined as a low BMI [29]. Maternal pregnancy weight gain was diagnosed by the guidelines of the Institute of Medicine (IOM) [30]; the recommendation for underweight, normal weight, overweight, and obese women is to gain 12.5∼18.0 kg, 11.5∼16.0 kg, 7.0∼11.5 kg, and 5·0∼9.0 kg, respectively; if weight gain exceeded that range, weight gain was defined as “above the IOM guidelines”; and if weight gain was below that range, it was defined as “below the IOM guidelines.”

2.7. Statistical Analyses

Differences in glycolipid metabolism indexes between two groups were assessed using Student’s t-test, ANOVA was used to compare more than two groups, and post hoc comparison was performed using Student-Newman-Keuls test. Continuous variables (insulin, HOMA-IR, and TG/HDL) that did not satisfy a normal distribution were subjected to natural logarithmic transformation before analyses. The χ² test was used to test the difference in prevalence rates of GLMD. A generalized linear model (GLM) was used to analyze the risk factors that may impact glycolipid metabolism. To reduce the collinearity of variables, model 1 mainly included the variables measured prenatally and in 2014, and model 2 mainly included the variables measured in 2019. Finally, model 3 included all the variables that may impact GLMD. Moreover, multivariable logistic regression was performed using diagnosed GLMD as the dependent variables with the impact factors from perinatal period to adolescence as independent variables. Adjusted R² was calculated to reflect the variance of independent variables on dependent variables. Participants with the missing responding variables were not included in the analyses, and the participants who finished the follow-up were compared with those who dropped out.

2.8. Ethics Approval

All research complied with the ethical guidelines of 1964 Declaration of Helsinki and its later amendments. The Institutional Review Board at the Children’s Hospital of Chongqing Medical University approved this study (File no: 2019-86). Informed consent was provided by all subjects and parents/guardians.

3. Results

3.1. General Characteristics

The general characteristics of the subjects are presented in Table 1. A total of 2,136 samples were included, with a follow-up rate of 70.0%, and the difference of characteristics of childhood between participants with follow-up and withdrawal is described in Supplementary eTable 1. The mean age was 11.68 ± 0.60 years, and 52.25% (1,116/2,136) were males. Biochemical indexes and anthropometric, perinatal, and SES variables are shown in Table 1.

3.2. Glycolipid Metabolism of Children with Different Characteristics

Table 2 displays the glycolipid metabolism results in adolescents. Adolescents with the characteristics of urban residence, female sex, older age, no pubertal development, dyslipidemia, and obesity had higher FI or HOMA-IR and TG/HDL than their counterparts. Meanwhile, HbA1c was higher in rural children and those with pubertal development, obesity, or maternal prepregnancy obesity than in their counterparts. In addition, TG/HDL were elevated in children with mother who experienced weight gain above IOM guidelines (), single parents (), and maternal hypertension (GH) compared with their counterparts ( and ). The levels of FI and HOMA-IR were higher in children with parents with higher education levels and family incomes than in their counterparts ().

3.3. Prevalence of Glycolipid Metabolism Disorder in Adolescents

Table 3 displays the prevalence of childhood GLMD. Overall, the prevalence rates of IR, prediabetes/diabetes, and dyslipidemia were 21.02%, 7.19%, and 21.61%, respectively. The prevalence rates of IR and dyslipidemia were higher in children with the characteristics of older age, dyslipidemia in young childhood (6∼9 years), and obesity than in their counterparts. Moreover, children with urban residence, LGA status, higher family income, and parental education also had increased prevalence of IR. The prevalence of prediabetes/diabetes was higher in children with abdominal obesity in 2014 and maternal prepregnancy obesity than in their counterparts.

3.4. Risk Factors of Glycolipid Metabolism Indexes Using a GLM

In GLM 1 (Table 4) (adjusted for sex, age, and region), the results showed that female sex, living in urban areas, and variables measured in 2014 (FBG, BMI, waist circumference [WC]) were risk factors for FI and HOMA-IR levels (all ), and older age was a risk factor for FI and IR (); variables in 2014 (FBG, dyslipidemia, and BMI) were the risk factors for TG/HDL level (all ), and FBG and BMI in 2014 were risk factors for HbA1c level (Supplementary ETable 2). Model 1 explained 12.43%, 11.92%, 10.32%, and 7.06% of the variance in FI, HOMA-IR, TG/HDL, and HbA1c levels, respectively.

The GLM (Table 4) revealed that female sex, older age, urban residence, and variables in 2019 (higher TG/HDL, BMI, WC, and father’s education ≥15 years) were risk factors for FI and HOMA-IR level, whereas increased BMI during pregnancy was a boundary protective factor for FI and HOMA-IR levels ( and ); HOMA-IR and WHtR in 2019, GH, and maternal weight gain below IOM guidelines were risk factors for TG/HDL levels (all ), whereas puberty was a protective factor for TG/HDL levels (all or ); FI in 2019 was a risk factor for HbA1c, and maternal prepregnancy obesity was a borderline risk factor for HbA1c level in model 2 () (Supplementary eTable 2). Model 2 explained 26.10%, 24.58%, 17.12%, and 5.90% of the variance in FI, HOMA-IR, TG/HDL, and HbA1c levels, respectively.

Finally, the results of the full model 3 are shown in Table 4. Older age, urban area, FBG in 2014, and variables in 2019 (higher TG/HDL, BMI, WC, and father’s education ≥15 years) were significantly correlated with elevated FI and IR levels (all ), while maternal prepregnancy weight gain was a protective factor for FI and IR levels (all ). Variables in 2014 (FBG and dyslipidemia) and variables in 2019 (HOMA-IR and WHtR) were risk factors for TG/HDL (all ). FBG in 2014 and BMI in 2019 were risk factors for HbA1c level (Supplementary eTable 2). The full model explained 28.36%, 26.33%, 19.39%, and 12.33% of the variance of FI, HOMA-IR, TG/HDL, and HbA1c levels, respectively.

3.5. Risk Factors for IR, Dyslipidemia, and Prediabetes/Diabetes Based on Logistic Regression

The risk factors for IR, dyslipidemia, and prediabetes/diabetes were analyzed by logistic regression model (Supplementary eTable 3). In the IR model, older age, urban residence, FBG in 2014, BMI in 2019, and father’s education ≥15 years had a significant impact on IR prevalence (), explaining 20.09% of the variance in IR. The dyslipidemia model showed that single parents, dyslipidemia, high FBG in 2014, and BMI in 2019 were risk factors for dyslipidemia, explaining 12.07% of the variance in dyslipidemia. The prediabetes/diabetes model revealed that WHtR in 2014 was a risk factor for prediabetes/diabetes, explaining 10.29% of the variance in prediabetes/diabetes.

4. Discussion

This study is the first bidirectional cohort study from the Southwest of China that involves perinatal, SES, and physical measurements over an average of 12-years’ follow-up from prenatal period to adolescence in urban-rural regions to ascertain the prevalence of GLMD and its potential influencing factors. This study found that GLMD was prevalence and the risk factors was from both prenatal and childhood period.

The prevalence of GLMD varies by region and age, and some variance is also attributed to different diagnostic criteria and methods. The current literature describes at least one lipid adverse level prevalence as 19%–25% in US children and adolescents [8, 31], and the prevalence of prediabetes/diabetes in another study [5] was comparable with that of our study. Elevated prevalence of GLMD has been observed in children with obesity in a cross-sectional study [32]. In this study, we found that childhood obesity is the strongest predictor of adolescent GLMD, even when adjusted with other risk factors. Moreover, the prevalence of HOMA-IR exceeded 44% in children who had obesity in comparison with the result from Yin et al.’s study [2], and the prevalence of dyslipidemia reached 28.57% in children with abdominal obesity, suggesting that healthcare programmes should be conducted for children with obesity or abdominal obesity combined with other risk factors.

In addition, a cross-sectional study revealed that elevated TG level was associated with increased HOMA-IR [33], and our cohort study first found that dyslipidemia and elevated fasting glucose at 6∼9 years of age were independent risk factors for HOMA-IR and dyslipidemia in adolescents (10∼14 years old). Adolescents with menarche or spermarche had decreased IR and lipid levels, which indicated that the prepubertal stage will impact GLMD among adolescents. Meanwhile, the transient IR phenomenon emerging during pubertal maturation is accepted as a physiological condition [2], which may be caused by an inadequate β-cell response to the decrease in insulin sensitivity [34]. In addition, glycolipid indexes (except HbA1c) were higher in females than in males, which coincided with the results of Interator et al. [35], and the mechanism may be dependent on the difference in the age of prepubertal stages between males and females.

Maternal adverse perinatal experiences will impact GLMD in the offspring [36, 37]. We found that maternal prepregnancy obesity was a risk factor for irregular HbA1c level. An animal study found that maternal obesity permanently alters the hypothalamic response to leptin and subsequently regulates appetite and pancreatic beta-cell physiology [36], which causes maternal and offspring changes in glycolipid levels. Moreover, our study found that both maternal pregnancy weight gain above IOM guidelines and GH were risk factors for elevated offspring TGs, which coincided with the results from young adulthood [38]. This phenomenon can be explained by shared genes or lifestyle. However, the conclusions were controversial, as a study with a small sample size found no association between GH and lipid levels in adolescents [39]; this finding needs to be verified by a large cohort study. In addition, SGA and LGA correlated with elevated HOMA-IR prevalence, which coincided with other findings [40]. Birthweight was correlated with nutritional status in utero, which may cause IR later in life; moreover, LGA is correlated with adolescent obesity, which is essential to IR.

SES is negatively correlated with cardiovascular disease. Our current cohort study provided further support for this concept in the adolescent population. A previous study [41] revealed that marital status of parents was the strongest socioeconomic predictor of young adult arterial stiffness, and we found that the TG level was higher in single-parent adolescents. In addition, the relationship between parental education and the cardiovascular risk of adolescent is controversial, and our results showed a positive relationship between parental education or family income and FI or IR. Studies have revealed a positive correlation between parental education and childhood obesity [42], and obesity was the strongest predictor of insulin sensitivity. Besides, our previous study found that the quality of life and personality traits were significantly associated with metabolic syndrome in children [11]. Moreover, we observed that rural residents have lower FI, IR, and TG levels but higher HbA1c levels, which could be induced by different dietary habits, as rural children consume less fat but more carbohydrates.

There are several limitations in our study. First, as this was a bidirectional cohort study, recall bias may exist for the prenatal variables. Birth certificates were reviewed to verify the birthweight, stature, and gestational age. Second, data on GH and diabetes were collected using a questionnaire, and recall bias existed. However, the perinatal information was collected both in 2014 and in 2019 independently.

In conclusion, the prevalence of GLMD and high glycolipid levels was elevated in adolescents with the features of obesity, maternal prepregnancy obesity, GH, SGA, LGA, and single-parent status. SES was positively correlated with HOMA-IR. To our knowledge, this is the first study to explore the relationship of risk factors from prenatal period to adolescence with glycolipid indexes in a large-sample-size cohort study of adolescents, and the correlation was significant after adjusting for covariates. Our study emphasizes the importance of reducing or controlling adiposity of prepregnancy mother and children, emphasizing the importance of providing support for single-parent children and reducing or preventing GH.

Data Availability

The data used to support the findings of this study were supplied by Xiaohua Liang and cannot be made freely available. Requests for access to these data should be made to [Xiaohua Liang, [email protected]].

Informed consent was provided by all subjects and parents/guardians.

Disclosure

This article is a preprint [43]; it has not been peer-reviewed by any journal.

Conflicts of Interest

The authors declare no conflicts of interest.

Authors’ Contributions

Xiao-Hua Liang conceived and designed the study, analyzed the data, and wrote the paper; Yuwei Wang, Lun Xiao, Jing-Yu Chen, Ping Qu, and Xian Tang participated in the acquisition and management of the data; and all authors revised the manuscript and critically reviewed and approved the final paper.

Acknowledgments

The authors would like to acknowledge the laboratory support of the Ministry of Education Key Laboratory of Child Development and Disorders and all the staff members of the 6 elementary schools in the two areas. This work was supported by the Major Health Project of Chongqing Science and Technology Bureau (no. CSTC2021jscx-gksb-N0001), Research and Innovation Team of Chongqing Medical University (no. W0088), Intelligent Medicine Research Project of Chongqing Medical University (no. ZHYX202109), Joint Medical Research Project of Chongqing Municipal Health Commission and Chongqing Science and Technology Bureau (no. 2020MSXM062), the Basic Research Project of Key Laboratory of Ministry of Education of China in 2021 (no. GBRP-202106), National Key Research and Development Project of the Ministry of Science and Technology of the People’s Republic of China (no. 2017YFC0211705), Young Scientists Fund Program of the National Natural Science Foundation of China (no. 81502826), and Young Scientists Fund Program of the Education Commission of Chongqing (no. KJQN201900443). Chongqing mediacl scientific research project (2020FYYX060).

Supplementary Materials

eTable 1: general characteristics of childhood between participants with follow-up and withdrawal. eTable 2: the risk factors for HbA1c level in adolescents. eTable 3: the logistic regression model of IR and glycolipid metabolism disorder. (Supplementary Materials)

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Copyright © 2022 Xiao-Hua Liang 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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