Study Finds Genes Explain 79% of Mother-Child and 94% of Father-Child BMI Link
Updated
Updated · EL PAÍS USA · Jul 8
Study Finds Genes Explain 79% of Mother-Child and 94% of Father-Child BMI Link
1 articles · Updated · EL PAÍS USA · Jul 8
Summary
PLOS Medicine research using data from tens of thousands of Norwegian families found genetics explains most parent-child BMI association by age 8—79% for mothers and 94% for fathers.
Lead author Tom Bond said the findings do not support genetic determinism, arguing obesity reflects genes interacting with environment and that healthy settings can still reduce inherited risk.
A separate four-generation British study reported last week said the population’s genetic makeup has changed little, but today’s food environment has strengthened the effect of obesity-related genetic predisposition.
Researchers say that helps explain why obesity rates have tripled over four decades: environment drives population-wide increases, while genetics helps determine which individuals are most likely to develop obesity.
A major international study published in June 2026 has clarified the long-debated link between parents' and children's Body Mass Index (BMI). Researchers overcame previous challenges by separating genetic factors from the biological effects of maternal weight during pregnancy. The study found a strong genetic basis for the similarity in BMI between parents and their children, providing clearer insights into how BMI is passed down through generations. By distinguishing genetic influence from other factors, this research marks a crucial step forward in understanding hereditary aspects of BMI and has important implications for developing effective interventions to manage childhood obesity.