Obesity linked to earlier puberty in girls
Print Edition
Girls of all races are entering puberty earlier than ever before, and US research yesterday suggests obesity may be a contributing factor, particularly in white girls.
Early puberty has been linked to a number of medical conditions, including increased risk of breast and ovarian cancer, as well as high blood pressure and depression.
White girls on average began developing breasts at a median age of 9.7 years, about four months earlier than found in a separate study in 1997, said the report in the journal Pediatrics.
A higher body mass index, or ratio of height and weight, was “the strongest predictor” of early breast development across all races in the study.
African-American girls continued to develop at earlier ages than whites and Asians, as previous studies also found, though no earlier than was noted in the 1980s and 1990s.
“The obesity epidemic appears to be a prime driver in the decrease in age at onset of breast development in contemporary girls,” said the research led by Frank Biro at Cincinnati Children’s Hospital.
The research is based on a group of 1,200 girls in New York, the San Francisco Bay area and the Cincinnati area, as part of the government-funded Breast Cancer and the Environment Research Program.
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