Genetics explain why some kids are bigger than others

The influence of genetic factors on differences between children's Body Mass Index increases from 43 percent at age four to 82 percent at age 10, reports a new study. The researchers studied 2,556 pairs of twins from the Twins Early Development Study. Data were collected in England and Wales in 1999 and 2005 when the twins were four and 10 years old respectively.

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