New Study Says Classic Childhood 'Adiposity Rebound' Is Actually Muscle Growth
Research presented at the European Congress on Obesity shows that the long-standing idea of an adiposity rebound in children is likely a misinterpretation of normal muscle and lean-tissue development.
At the recent European Congress on Obesity in Istanbul, researchers led by Andrew Agbaje presented an analysis that challenges the 42-year-old adiposity rebound hypothesis. Using waist-to-height ratio, a more accurate proxy for body fat, they showed that children’s fat levels continue to fall through age seven, while BMI climbs due to muscle and lean-mass growth. The study examined data from the 2021-2023 NHANES cycle, covering 2,410 multiracial participants aged 2-19.
Earlier diet-intervention trials also failed to shift the timing of the BMI rise, supporting the view that the pattern is a normal growth phase, not a disease marker. Agbaje argues that the rebound notion is a statistical artifact and recommends adopting waist-to-height ratio for pediatric obesity screening. A free WHtR calculator has been released to aid clinicians in detecting excess fat in children.
Why it matters
It could reshape how doctors assess and intervene in childhood obesity, avoiding unnecessary treatments.
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