Body Composition Assessment in Pediatric Populations

Assessing body composition in children and adolescents is fundamental for understanding growth, nutritional status and disease risk. Unlike simple anthropometry, which relies on weight and height alone, body composition analysis distinguishes fat mass and fat-free mass, providing insights into metabolic health, developmental trajectories and the early origins of obesity and cardiometabolic disorders. A range of methods is employed, from skinfold measurements and bioelectrical impedance to advanced imaging and isotopic techniques. Each approach carries trade-offs in accuracy, cost, accessibility and suitability across age groups. Reliable reference data are increasingly available for infants, toddlers and older children, enabling clinicians and researchers to interpret individual results against age-, sex- and population-specific centiles. Enhanced standardisation, improved prediction algorithms and global reference charts now support longitudinal monitoring, early identification of at-risk individuals and the evaluation of interventions aimed at promoting healthy growth and preventing chronic disease.

Research from Nature Portfolio

A large cross-sectional study of 7–18-year-olds compared tri-ponderal mass index and body mass index z-scores in predicting elevated blood pressure. Both indices showed significant associations with hypertension risk, but body mass index demonstrated superior predictive accuracy for high blood pressure across sexes. This work highlights the importance of refining anthropometric screening tools and establishing age- and sex-specific cut-offs to improve early detection of paediatric hypertension and guide preventive strategies.

Body Composition Assessment in Pediatric Populations publication trend

The graph below shows the total number of articles in body composition assessment in pediatric populations across all publications each year (not limited to Nature Index journals).

Technical terms

Body mass index (BMI): Ratio of weight (kg) to height squared (m²), widely used to screen for underweight, overweight and obesity but unable to distinguish fat from lean tissue.

Tri-ponderal mass index (TMI): Ratio of weight (kg) to height cubed (m³), proposed as a more stable estimator of adiposity during childhood and adolescence.

Air displacement plethysmography (ADP): Method measuring body volume via air displacement to calculate fat and fat-free mass with high precision, often using an infant-sized chamber.

Dual energy X-ray absorptiometry (DXA): Imaging technique that uses low-dose X-rays at two energies to differentiate bone mineral, lean tissue and fat mass.

Total body water (TBW) by deuterium dilution: Isotopic procedure to estimate fat-free mass based on the dilution space of labelled water in the body.

Fat mass (FM): Total amount of adipose tissue in the body, typically expressed in kilograms or as a percentage of total body weight.

Fat-free mass (FFM): Combined weight of all non-fat tissues—including muscle, bone, organs and body water—reflecting lean components of body composition.

References

1. Associations between tri-ponderal mass index, body mass index, and high blood pressure among children and adolescents: a cross-sectional study. Scientific Reports (2023).
2. Body composition reference charts for infants from birth to 24 months: Multicenter Infant Body Composition Reference Study. American Journal of Clinical Nutrition (2023).
3. Tri-ponderal mass index as a screening tool for obesity prediction in children aged 6–9 years. Frontiers in Endocrinology (2023).
4. BMI is a poor predictor of adiposity in young overweight and obese children. BMC Pediatrics (2017).