There are 100 genetic markers linked to obesity but it only seems to contribute to 3% of the difference in body mass index between people. To help us understand the difference between genetics (nature) and habits (nurture), scientists in England compared the weight of adopted children with that of biological children of overweight parents. Conclusion: The lifestyle of the parents had a greater influence on the weight of the children than did genetics. Once again, genetics loads the gun, but lifestyle pulls the trigger.
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