- 1Department of Food and Nutrition, Institute of Home Economics, University of Delhi, New Delhi, India
- 2Department of Population Health, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
- 3Department of Pediatrics and Clinical Epidemiology, Sitaram Bhartia Institute of Science and Research, New Delhi, India
- 4Koita Centre for Digital Health, Ashoka University, Panipat, India
Background: Low birth weight (LBW) is a public health problem in India with consequences in the short and long term. It increases the risk of obesity and its related comorbidities including type 2 diabetes and cardiovascular disease (CVD) in later life. This study aimed to assess the risk markers of chronic disease in term born low birthweight Indian children aged 8–14 years.
Methods: This was a cross-sectional follow-up of LBW children from DIViDS (Delhi Infant Vitamin D Supplementation) cohort and involved assessment of their anthropometric measurements, body composition, levels of adipokines and biomarkers of chronic diseases. Neighbourhood children born normal birth weight (NBW) (>2.5 kg) were enrolled for comparison.
Results: The study included 667 LBW and 87 NBW children. Height-for-age, body mass index for-age (BMIZ), fat-free mass index, and waist circumference of LBW children were lower than those of NBW children. LBW children could jump farther. LBW children who were now overweight had higher leptin, triglyceride and VLDL and lower HDL, compared to NBW children in the same BMIZ category. Currently underweight LBW children had higher adiponectin and lower leptin levels than the reference group. There were no differences between LBW and NBW children in visfatin, fasting glucose and insulin, hemoglobin A1c, triglyceride, low density lipoprotein or C-reactive protein.
Conclusion: At 8–14 years few children were overweight and there were few differences in some risk markers of chronic disease between LBW and NBW children. Overweight, which was associated with some increased risk markers, may increase with age, thus timely counselling and monitoring of these LBW children will be important to mitigate these risks.
Introduction
Weight at birth is an important predictor of immediate and long-term health (1). The prevalence of low birth weight (LBW) in low- and middle-income countries is more than twice that of high income countries (2). Though repeated rounds of Indian national surveys from 2005 to 06 to 2019-21 have reported a drop in the prevalence of LBW from 22% to 18%, the proportion of children born LBW in India in the past 5 years remains unchanged at 18% (3, 4). LBW not only increases the risk of fetal and neonatal mortality and morbidity but also is associated with impaired physical and cognitive development, thus adding to the burden of the nation's public health (2).
LBW has been associated with the risk of obesity, insulin resistance and cardiometabolic diseases in later life (5). An explanation for this increased risk of non-communicable diseases (NCDs) is the capacity-load model whereby children born LBW start their life with low metabolic capacity, which, starting in childhood, gets challenged by the increasing exposure to metabolic load, as evidenced by overweight (6). This is relevant to a country like India, with a high prevalence of LBW infants, coupled with a nutritional and epidemiological transition, resulting in a surge of diabetes and other NCDs (7, 8). Indians are at an increased risk of NCDs at lower body mass index (BMI) than other ethnic groups (9, 10). It is important to understand the mechanisms involved in this risk.
White adipose tissues produce the hormones leptin, visfatin and adiponectin, collectively called adipokines (11). While leptin and visfatin exert pro-inflammatory properties, adiponectin is anti-inflammatory (12). An increase in leptin and visfatin which reflect body fat mass, and a concomitant decrease in adiponectin level may contribute to the pathogenesis of obesity-linked metabolic and cardiovascular complications (11, 13–16). Plasma adiponectin levels are negatively associated with the accumulation of body fat, especially, visceral fat (13). Low adiponectin is linked to metabolic syndrome and recognized as a standalone risk factor for type 2 diabetes in later life (13, 17).
This study was designed to determine if Indian school-aged children born term LBW differ from those born normal birth weight with respect to their body composition, levels of adipokines, and other biochemical parameters and whether differences depended on children's later anthropometry.
Materials and methods
The term-born LBW children in the study, were participants of the Delhi Infant Vitamin D Supplementation Study (DIVIDS) cohort (18, 19) set up in 2007. Of the 2079 LBW children in the original DIVIDS cohort (DIVIDS-1), 912 were followed up in DIVIDS-2 (2012-14) (19). This study (referred to as DIVIDS-3), conducted from November 2019 to December 2022, at the Institute of Home Economics (IHE), New Delhi, is a cross-sectional follow-up of DIVIDS children now aged 8–14 years (18, 19) (Supplementary Figure S1).
Study participants
Full term LBW children belonging to the second follow up study (DIVIDS-2) (19) were traced and contacted using the telephone numbers and addresses documented earlier. They were invited to join the DIVIDS-3 study. For comparison, children born normal birth weight (NBW) (>2.5 to <4 kg) at term (>37 weeks gestation) from the same neighbourhoods and comparable age range (8–14 years) were contacted for enrolment. If a parent of a NBW child showed willingness to participate, the child's inclusion in the study was determined by checking the hospital discharge document having the date of birth, birth weight, and gestational age at birth. Children whose birth weight could not be documented were not recruited.
Study procedures
Parents and children were invited to IHE for assessments after an overnight fast by the child. Consent from the parent/guardian and assent from the child was obtained. A baseline saliva sample was collected for a deuterium dilution test and a deuterated water dose was given (see below). Details pertaining to sociodemographics and household assets were obtained using a questionnaire and anthropometric measures were taken. A medical doctor conducted a medical check-up and measured blood pressure using a digital OMRON machine (Model No. JPN1).
Anthropometry
Anthropometric measures, including, height, weight, circumferences of waist, hip and mid-upper arm, and skinfold thickness at triceps and subscapular were taken using standard equipment, following standard operating procedures (20). Standing height (cm) was measured with a stadiometer (model no. SECA 222) to the nearest 0.1 cm. A digital Omron weighing scale (model no. HN-286) accurate to 0.1 kg was used to measure body weight. Circumferences of waist, hip and mid-upper-arm were measured to the nearest 0.1 cm using non-stretch tapes (model no. SECA 201). Triceps and subscapular skinfold thickness were measured by Harpenden skinfold callipers to the nearest 0.2 mm. All measures were taken in triplicate and medians were used in analysis. Technical error of measurement (TEM) was calculated periodically through the period of data collection and was within acceptable limits for all anthropometric measurements (21).
Muscle strength
The muscle strength of children was measured by hand grip strength for upper limbs and long jump for lower limbs. Hand grip strength was measured with a hand-held dynamometer (TKK 5401, Takei Scientific Instruments Co. Ltd., Japan). Each child also performed a distance jump from a standing start. The distance from the jump-starting line to the trailing edge of the heel at the point of landing was measured. These measurements were taken in triplicate. The highest value attained by the dominant hand for grip strength and the maximum jump distance covered (expressed in metres) were used for analysis.
Biochemical assessment
The venous blood of the children was collected by a trained phlebotomist in EDTA-coated tubes to determine glucose (hexokinase method; Beckman Coulter AU-680), insulin (chemiluminescence; Architect I-2000), hemoglobin A1c (HbA1c) (HPLC; Tosoh G-8), plain tubes for lipid profile (spectrophotometry; Beckman Coulter AU-680), adipokines (ELISA; Bio-Rad, model no. PR 4100), C-reactive protein (CRP) (immunoturbidimetry; Beckman Coulter AU-680). For all assays except adipokines, blood samples were sent to Dr Lal Path laboratory (Delhi; NABL accredited) for analysis.
Adipokine blood samples were centrifuged at IHE and the serum stored at −80°C for later batched analysis. Leptin and adiponectin were estimated using ELISA kits from Diagnostic Biochem Canada, while visfatin was assessed using kits from BioVendor, R&D. Estimation of all adipokines was done in duplicate. Internal standards were included in each run and results for these were within acceptable limits. Intra- and inter-assay coefficients of variation for a pooled serum sample of adipokines included in each run were within 5% and 10% respectively.
Deuterium dilution test
After collection of the baseline saliva sample using a cotton swab, a standard dose of 1.8 g deuterated water, equivalent to 0.06 g/kg body weight for an average 30 kg child, was orally administered to each child. Four hours later (equilibrium period), a post-dose saliva sample was collected for analysis of deuterium enrichment. The saliva samples were stored at −80°C and analysed for deuterium enrichment by isotope ratio mass spectrometry at St John's Medical College, Bengaluru, as described previously (19).
Sample size
The sample size was based on the number of children who could be recruited: 650 LBW and 87 NBW children. Based on calculations for differences between two means, and including a calculation for groups of different sizes (22), the number of children available was sufficient to detect an effect size of 0.11 in unadjusted analyses using a two-sided test with α = 0.05% and 80% power.
Ethics
Ethical approval was obtained from Institutional Ethical Committee of IHE, University of Delhi, Sitaram Bhartia Institute of Science and Research, and the London School of Hygiene and Tropical Medicine. Parents provided written or thumbprint (among people unable to write) consent for their child's participation and a written assent was obtained from the children themselves. Details pertaining to the participants were kept confidential. Whenever necessary, treatment or referrals were made by the study medical doctor.
Statistical analysis
Data was double-entered in EpiInfo 7.0.2, cleaned and exported to STATA 16.0 for further analysis. Principal Component Analysis (PCA) was used to compute socio-economic status (SES) using asset ownership data; the first component of the PCA was divided into terciles. Standardised age- and sex specific z-scores for height (HAZ) and BMI (BMIZ) were calculated using Stata zanthro commands and the WHO growth references. Fat mass index (FMI) and fat-free mass index (FFMI) were calculated by dividing fat mass and fat-free mass by the square of height (m), respectively. Chi square test for proportions was used to assess the differences in the sociodemographics of the two groups of children. Analyses for body composition and anthropometric variables were stratified by sex. Biochemical parameters differed little by sex so were analysed with both sexes together and sex as a covariable. Multivariate linear regression determined differences in the continuous outcomes, adjusted for age and sex for biochemical outcomes. Regression analyses were further adjusted for sociodemographic variables that differed between LBW and NBW children. We did not control for the original treatment group in the DIVIDS-1 vitamin D intervention trial from birth to 6 months since we detected no remaining group differences in the children when previously followed up aged about 5 years (19). In order to investigate the capacity-load model, we assessed the interaction between birth weight group and current BMIZ category for their associations with adipokines. Forest plots were generated to illustrate these results.
To account for potential errors in weight measurements in routine healthcare services, we did a sensitivity analysis which included only those NBW children with documented birthweight >2.7 kgs.
Results
Sociodemographic characteristics
There were 87 NBW and 667 LBW children. The low enrolment of NBW children was attributable to our inclusion criterion of having a documented birthweight record of the child. Half of the children in each group were girls. The mean birth weight for LBW children was 2.2 (SD 0.1) kg and 2.9 (SD 0.3) kg for NBW children (Table 1). Two-third of fathers and over half of mothers had at least secondary education. Most mothers were housewives and most fathers were daily wagers for both groups of children. More NBW participants were from the medium SES tercile with fewer in the high SES tercile. Mother's education and SES tercile were the only differences between LBW and NBW children and these variables were included in adjusted analyses.
Anthropometry and body composition
The LBW children were significantly older than the NBW children (Table 2) which likely contributed to the higher values of some anthropometric measures, such as LBW males' height in cm; however, HAZ was lower in these LBW males compared to NBW males. For both sexes, waist circumference was lower in the LBW children and hip circumference was also lower for LBW males than for their NBW counterparts. NBW children had higher FFMI than LBW children. Grip strength did not differ between LBW and NBW children but, even after adjusting for age and height, LBW children could jump further than NBW children. Systolic blood pressure was higher in LBW compared with NBW males in age-adjusted analyses but not in analyses further adjusted for maternal education and SES.
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Table 2. Anthropometry, body composition, muscle strength and clinical data of LBW and NBW children by group and sexa,b.
Biochemical tests
LBW children had slightly but significantly higher total cholesterol, very low-density lipoproteins (VLDL) and high-density lipoprotein (HDL) than NBW children (Table 3). In LBW children, serum adiponectin levels were higher while leptin levels were lower than in NBW children, in both unadjusted and adjusted analyses. There were no differences in glucose homeostasis variables (HbA1c, fasting glucose and insulin) or CRP levels among the two groups of children.
We further investigated whether the associations were modified by current BMI, expressed as categories based on BMIZ scores (Figure 1). Adiponectin was high in all BMI categories of LBW children compared with the reference group of NBW children in the same BMI category. Younger children had lower adiponectin than older children but there was no association with sex. Compared with the reference group, underweight children born LBW had lower leptin levels and overweight children had higher levels; girls had higher leptin levels, independent of BMIZ. Unlike leptin, visfatin levels were higher in undernourished children with BMIZ < −2 and lower in overweight/obese LBW children when compared to their normal counterparts. Total cholesterol was higher among all BMI categories of LBW children. HDL was higher in underweight LBW children and there were trends for higher triglyceride, LDL and VLDL among overweight/obese LBW children when compared to NBW children of similar BMI. HDL levels were lower in girls, while cholesterol, HDL, LDL and VLDL were lower in younger children.
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Figure 1. Association of current body mass index with adiponectin, leptin, visfatin, cholesterol, HDL Triglyceride, LDL and VLDL levels in low birth weight compared with normal birth weight children. The reference group was NBW children of currently normal BMIZ; Females are compared to males as the reference; Y axis in the forest plot indicate LBW children within different categories of current BMI; BMIZ < −2: Grade 2 & 3 thinness (n = 146); BMIZ −2 to −1: Grade 1 thinness (n = 228); BMIZ −1 to +1: Normal (n = 325); BMIZ > +1: Overweight and obese (n = 54); LBW, low birth weight; BMIZ, body mass index Z score; HDL, high density lipoprotein.
Results of sensitivity analysis, involving NBW children weighing >2.7 kgs at birth (total N = 55; Male = 31; Female = 24) were similar to those based on primary analysis including 87 NBW children with >2.5 kg birth weight (Supplementary Tables S1 and S2).
Discussion
The aims of our study were to assess the impact of early life under-nutrition on health risks in Indian children aged 8–14 years born low birth weight at term and to determine whether any differences were influenced by current anthropometry. Our results indicate that HAZ and BMIZ scores of LBW children, born at term, were lower than those of NBW children while the waist circumference of all LBW children and hip circumference of only LBW male children was lower than the NBW counterparts. Blood biochemistry for assessing markers of chronic NCD risk indicated modest differences: Children born LBW had marginally higher total cholesterol and HDL, compared to NBW children whereas fasting glucose and insulin, HbA1c, triglyceride, LDL and CRP did not differ between the two groups of children. The LBW children had higher plasma adiponectin and lower plasma leptin than the NBW children but there was no difference in visfatin. Birth weight group interacted with current BMI category for associations with biochemical results; specifically, currently overweight LBW children had higher leptin and VLDL but lower HDL than overweight NBW children and underweight LBW children had higher adiponectin than underweight NBW children. Overall, the results suggest metabolic differences between LBW and NBW children; LBW children gain excess weight.
LBW children are more likely to be stunted than NBW (23, 24), which may further reflect in adulthood (25). Reduced adult height has been correlated in some studies with impaired glucose tolerance test (26, 27). Thus, the reduced HAZ in these LBW children could become a risk factor for later life type 2 diabetes. Moreover, muscle being a crucial site for insulin-stimulated glucose absorption, the lower FFMI in the LBW children may increase their future risk of insulin resistance (10). In addition, increased consumption of an energy-dense diet, primarily from fat, in these LBW children (27) can predispose them to obesity later in life which could then help to explain why adults with LBW have higher percentages of body fat (28). The low anthropometric variables seen in most DIVIDS LBW children may be because of their ongoing adverse socioeconomic conditions (29, 30). Although some studies of long-term outcomes associated with LBW have not mentioned gestational age (31, 32), Yajnik et al. (33) showed that the risk of NCDs in later life could prevail, irrespective of the gestational age of the LBW child.
Persistently high serum leptin levels as seen in obesity, may lead to the development of leptin resistance (11, 34). In our study, only those LBW children with higher current BMIZ score, although still low with respect to the international standards, showed higher leptin levels, perhaps because of increased adiposity. Obese individuals often have not only higher leptin levels but also higher visfatin and lower adiponectin levels relative to lean persons (35–37). In a case-control study from South America, full term LBW children (n = 765; 6–11 years old) with high abdominal circumference, insulin resistance, and systolic blood pressure had lower circulating adiponectin concentration (38). Additionally, European female adolescents born LBW (n = 429) had high fasting serum leptin levels (39). The BMI of the study population in the above-mentioned studies showed no correlation with circulating levels of adipokines. The difference from these studies and ours may be that in these studies participants were in more socioeconomically advantaged environments which permitted increases in total and visceral fat.
While the LBW children had higher serum cholesterol overall as well as higher leptin, VLDL and triglyceride compared to NBW children of similar BMI, and exhibited lower FFMI, changes in markers of risk of chronic disease in our cohort were fairly modest, possibly because these children are still young; changes in these risk markers are usually manifested in adulthood. From clinical and public health perspectives, stakeholders should be aware of a greater possibility of developing dyslipidemia and associated cardiometabolic risk factors like higher blood pressure in term LBW adolescents, especially if they gain excess weight.
The strength of this study is the anthropometric measurements, body composition, and biochemical profile of a large number of school-going Indian children born LBW weight for whom we have previous data. A limitation is that we were only able to enrol a limited number of normal birth weight children (n = 87) with birth weight >2.5 kg.
Conclusion
This study adds evidence to the growing literature on anthropometric and blood profiles of LBW term Indian children during childhood. Anthropometric or biochemical risk factors might not be evident in childhood but may surface in later adult life (28). The findings of higher leptin and triglycerides among LBW with high BMIZ score compared to NBW children of similar BMI suggests a potential future problem which requires intervention during childhood when risks are potentially modifiable. In the backdrop of rapidly escalating NCD burden, there is an urgent need to formulate appropriate guidelines for routine screening for cardiometabolic risk and life-style counselling in adolescents. Future research should focus on identifying robust predictors of developing cardiometabolic risk in adolescence, including from early life antecedents.
Data availability statement
The datasets presented in this article are not readily available due to Government of India restrictions. Requests to access the datasets should be directed to the Principal Investigator (PI), who could apply to the Health Ministry's Screening Committee (HMSC) for requisite permissions for sharing the data.
Ethics statement
Ethical approval was obtained from Institutional Ethical Committee of IHE, University of Delhi, Sitaram Bhartia Institute of Science and Research, and the London School of Hygiene and Tropical Medicine. Parents provided written or thumbprint (among people unable to write) consent for their child’s participation and a written assent was obtained from the children themselves. Details pertaining to the participants were kept confidential. Whenever necessary, treatment or referrals were made by the study medical doctor.
Author contributions
YG: Data curation, Formal Analysis, Investigation, Software, Writing – original draft, Writing – review & editing. AM: Data curation, Formal Analysis, Investigation, Software, Writing – original draft, Writing – review & editing. SF: Conceptualization, Formal Analysis, Software, Writing – review & editing. RP: Project administration, Supervision, Writing – review & editing. HPS: Conceptualization, Writing – review & editing. GT-K: Conceptualization, Writing – review & editing, Formal Analysis, Funding acquisition, Software, Supervision.
Funding
The author(s) declare financial support was received for the research, authorship, and/or publication of this article.
The study was funded by the DBT-Wellcome Trust India Alliance Senior Fellowship in Public Health grant (IA/CPHS/17/1/503334).
Acknowledgments
We are grateful to the field workers, Ms. Ramita Sarsar, Mr. Antoni Minz and Mr. Naveen for coordinating participant visits. We would also like to thank our study participants for their time and cooperation throughout the study, without whom the study would not have been possible.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher's note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Supplementary material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fped.2024.1339808/full#supplementary-material
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Keywords: chronic disease, biomarkers, low birth weight, children, India
Citation: Gusain Y, Malik A, Filteau S, Pathak R, Sachdev HS and Trilok-Kumar G (2024) Markers of chronic disease risk in term low birthweight Indian children aged 8–14 years. Front. Pediatr. 12:1339808. doi: 10.3389/fped.2024.1339808
Received: 16 November 2023; Accepted: 8 August 2024;
Published: 29 August 2024.
Edited by:
Maria Oana Sasaran, “George Emil Palade” University of Medicine, Pharmacy, Sciences and Technology of Târgu Mureș, RomaniaReviewed by:
Maria Karalexi, University of Ioannina, GreeceNihar Ranjan Mishra, Kalyani (AIIMS Kalyani), India
Copyright: © 2024 Gusain, Malik, Filteau, Pathak, Sachdev and Trilok-Kumar. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Geeta Trilok-Kumar, geetatrilokkumar@gmail.com
†These authors have contributed equally to this work and share first authorship