Signs of cardiometabolic damage in children who are overweight appear as early as 6-8 years of age, but were not evident in preschoolers, providing a window of opportunity for intervention, show the latest results from a long-running Danish study of childhood weight.
The proportion of children who were overweight (nearly 14% in 2015) was similar between the two groups – those of preschool age (2-5 years) and school age (6-8 years) – but only the latter showed significant signs of cardiometabolic abnormalities.
The results, published in Obesity Research & Clinical Practice, are the latest in a series of many findings from the HOLBAEK study (formerly known as The Danish Childhood Obesity Biobank) that have emerged since it began in 2007. They were presented, along with a meta-analysis of much of their work, at the European Congress on Obesity (ECO) 2022.
“When comparing children with and without overweight, there were only barely significant differences among the preschool children,” said investigator Christine Frithioff-Bøjsøe, MD, but in contrast, “the school children with overweight exhibited significantly higher systolic blood pressure, glucose, insulin, and higher HDL cholesterol,” among other markers, she noted.
“Detection needs to start as early as age 2-5 years because if you wait just a few years longer these children will show early signs of disease starting to take hold. This could provide a critical window to detect and manage overweight,” said Frithioff-Bøjsøe, PhD, of the Children’s Obesity Clinic, Copenhagen University, Hospital Holbaek, Denmark.
Asked to comment, Aaron S. Kelly, PhD, professor of pediatrics, codirector, University of Minnesota Center for Pediatric Obesity Medicine in Minneapolis, said: “Recent results from HOLBAEK highlight the critical importance of identifying obesity early in life, before its complications spring up.
“Ideally, we should be in the business of managing and reducing excess adiposity as soon as it surfaces with the goal of preventing the onset of cardiometabolic risk factors, not watchful waiting and hoping for the best.”
Routine dental visits checked overweight
In the newest study, the researchers trained dental assistants to measure weight and height and carried out body mass index assessments during routine appointments.
A total of 335 preschool and 657 school-age children were recruited for the study. Of these, 40% attended additional hospital-based examinations including blood pressure measurement and a blood sample. Children were reexamined approximately 1 year later.
Systolic blood pressure, for example, was significantly higher in 6- to 8-year-olds with overweight compared to those of normal weight (P = .001). There was no significant difference between systolic blood pressure of 2.5- to 5-year-olds without and with overweight.
Likewise, with insulin resistance, there was no significant difference between preschoolers with and without overweight. However, in schoolchildren, homoeostasis model of assessment–insulin resistance (HOMA-IR) was significantly higher in those with overweight, at 2.2, compared to those without, at 0.9 (P < .001).
Also, during follow-up (around a year later), the prevalence of overweight did not change in preschool children but increased from 13.7% to 17.0% in schoolchildren.
The researchers noted that, in Europe, it is the primary health care sector that has continuous contact with the pediatric population, with the potential for early evaluation of children at risk. Their decision to use dental health care assistants to assess weight in this particular study is novel, but feasible, they observed.