A British study discovered that a child becomes overweight due to the influence of his or her same-sex parent and not because of genetics, the Australian Associated Press reported.

For example, if a girl’s mother is overweight, then she is more likely to gain weight, according to a study from the Peninsula Medical School at the Universities of Exeter and Plymouth in England. The same thinking holds true for sons and fathers.

The discovery proposes that behavior, not genetics, has more to do with determining a child’s size.

In a study of 226 British families, researchers found that obese women were 10 times more likely to have a daughter who was obese. Obese dads were six times more likely to have a son who was obese.

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