Healthy Weight for 15‑Year‑Olds: BMI, Body Composition & Context

BMI interpretation in adolescents requires age‑ and sex‑specific percentiles, not adult cut‑points.

Example

• Boy, 5 ft (152 cm), 130 lb (59 kg) → BMI 19.6 → ~55th percentile (healthy).
• Girl, same height/weight → BMI 22.5 → ~85th percentile (overweight).

Why Percentiles Matter

• Body composition changes dramatically during puberty (fat mass ↑ in girls, lean mass ↑ in boys).
• CDC/WHO growth charts account for this.

Assessment Beyond BMI

• Waist circumference, waist‑to‑height ratio.
• Body fat % (bioimpedance, skinfolds, DXA).
• Fitness, dietary patterns, psychosocial well‑being.

Clinical Approach

Plot on growth chart; if BMI ≥85th %ile, assess cardiometabolic risk (lipids, glucose, liver enzymes, BP). Focus on healthy behaviors, not weight loss per se, unless severe obesity with comorbidities. Involve pediatrician, dietitian, mental health as needed.