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Home Science & Environment Medical Research

Kids of obese parents more likely to develop obesity due to inheriting related genes

August 5, 2025
in Medical Research
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Kids of obese parents more likely to develop obesity due to inheriting related genes
Relationship between mother’s and father’s BMI and offspring BMI by survey sweep estimated by phenotypic linear regression and Mendelian randomization. Credit: Wright L et al., 2025, PLOS Genetics, CC-BY 4.0 (creativecommons.org/licenses/by/4.0/)

A new study finds that kids with obesity are more likely to have obese parents because they inherit obesity-related genes, and to a smaller extent, are impacted indirectly by genes carried by the mother—even when those genes aren’t passed down.

A new study led by Liam Wright of University College London, UK, and colleagues, reports these findings in the open-access journal PLOS Genetics.

Studies commonly show that children with obesity often have parents with obesity, but the cause of this trend has been poorly understood. Children may inherit genes from their parents that increase their risk of obesity, or they could be shaped by conditions in the womb, or by the food and lifestyle choices their parents make.

In the new study, researchers investigated the effects of the parents’ genetics on the weight and diet of their children. They looked at a measure of obesity called the body mass index (BMI), along with the diet and genetic data from more than 2,500 mother-father-child trios.

They focused on obesity-related genes in the parents—both the ones that were directly passed down to their children, and the genes that weren’t, but that may indirectly impact weight by shaping the child’s environment, which are called genetic nurture effects.

They found that, though mothers’ and fathers’ BMIs were consistently correlated with the child’s BMI, this trend could mostly be explained through the genes that children directly inherit. Genetic nurture effects from obesity-related genes in the mother that were not inherited had a smaller impact, only during the child’s adolescence.

The results suggest that a mother’s BMI may be particularly important for determining a child’s BMI, both due to the effects of genes that children directly inherit, and through indirect nurture effects from genes that weren’t passed down.

Meanwhile, fathers had little impact on their child’s BMI, apart from the genes that were directly inherited. The study’s authors suggest that analyses that don’t consider the inherited genes are likely to give misleading estimates of the parents’ influence on a child’s weight.

The authors add, “Our results suggest mothers’ weight could affect their children’s weight; policies to reduce obesity could have intergenerational benefits.”

More information:
Wright L, et al. The association between parental BMI and offspring adiposity: A genetically informed analysis of trios. PLOS Genetics (2025). DOI: 10.1371/journal.pgen.1011775

Provided by
Public Library of Science


Citation:
Kids of obese parents more likely to develop obesity due to inheriting related genes (2025, August 5)
retrieved 5 August 2025
from https://medicalxpress.com/news/2025-08-kids-obese-parents-obesity-due.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.




Kids of obese parents more likely to develop obesity due to inheriting related genes
Relationship between mother’s and father’s BMI and offspring BMI by survey sweep estimated by phenotypic linear regression and Mendelian randomization. Credit: Wright L et al., 2025, PLOS Genetics, CC-BY 4.0 (creativecommons.org/licenses/by/4.0/)

A new study finds that kids with obesity are more likely to have obese parents because they inherit obesity-related genes, and to a smaller extent, are impacted indirectly by genes carried by the mother—even when those genes aren’t passed down.

A new study led by Liam Wright of University College London, UK, and colleagues, reports these findings in the open-access journal PLOS Genetics.

Studies commonly show that children with obesity often have parents with obesity, but the cause of this trend has been poorly understood. Children may inherit genes from their parents that increase their risk of obesity, or they could be shaped by conditions in the womb, or by the food and lifestyle choices their parents make.

In the new study, researchers investigated the effects of the parents’ genetics on the weight and diet of their children. They looked at a measure of obesity called the body mass index (BMI), along with the diet and genetic data from more than 2,500 mother-father-child trios.

They focused on obesity-related genes in the parents—both the ones that were directly passed down to their children, and the genes that weren’t, but that may indirectly impact weight by shaping the child’s environment, which are called genetic nurture effects.

They found that, though mothers’ and fathers’ BMIs were consistently correlated with the child’s BMI, this trend could mostly be explained through the genes that children directly inherit. Genetic nurture effects from obesity-related genes in the mother that were not inherited had a smaller impact, only during the child’s adolescence.

The results suggest that a mother’s BMI may be particularly important for determining a child’s BMI, both due to the effects of genes that children directly inherit, and through indirect nurture effects from genes that weren’t passed down.

Meanwhile, fathers had little impact on their child’s BMI, apart from the genes that were directly inherited. The study’s authors suggest that analyses that don’t consider the inherited genes are likely to give misleading estimates of the parents’ influence on a child’s weight.

The authors add, “Our results suggest mothers’ weight could affect their children’s weight; policies to reduce obesity could have intergenerational benefits.”

More information:
Wright L, et al. The association between parental BMI and offspring adiposity: A genetically informed analysis of trios. PLOS Genetics (2025). DOI: 10.1371/journal.pgen.1011775

Provided by
Public Library of Science


Citation:
Kids of obese parents more likely to develop obesity due to inheriting related genes (2025, August 5)
retrieved 5 August 2025
from https://medicalxpress.com/news/2025-08-kids-obese-parents-obesity-due.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.



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