Genetic and environmental effects on body mass index from infancy to the onset of adulthood: an individual-based pooled analysis of 45 twin cohorts participating in the COllaborative project of Development of Anthropometrical measures in Twins (CODATwins) study.

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This large twin study shows that both genes and environment shape body weight (BMI) from infancy through young adulthood, with genetics playing a bigger role in the teen years—useful context for families managing weight concerns often seen in children with 16p11.2 variations.