Puberty

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Study Finds Girls Entering Puberty Younger; Obesity Implicated

Retailer J.C. Penney features a Girls Plus clothing department tailored to overweight girls in this April, 2004 photo. (Scott Olson/Getty Images)

Retailer J.C. Penney features a Girls Plus clothing department tailored to overweight girls. (Scott Olson/Getty Images)

Building on earlier research a major new study has found that girls are starting puberty at even younger ages. The most significant changes were seen in Caucasian girls and in girls who are overweight or obese. Still, girls who were not overweight were also entering puberty younger, the study found.

Researchers at three sites around the country — including the San Francisco Bay Area — followed 1,239 ethnically diverse girls from 2004 to 2011. They looked at breast development, a key marker for the start of puberty.

Girls who mature earlier are at risk for lower self-esteem and higher rates of depression.
Earlier studies had shown that African-American girls had reached this milestone at younger ages. “Now it looks like it’s happening earlier for Caucasian girls,” said Dr. Louise Greenspan, a pediatric endocrinologist with Kaiser San Francisco and one of the authors of the study. “Particularly, the overweight Caucasian girls are developing earlier than they have in the past.”

Researchers looked at a number of factors, but the “obesity epidemic appears to be a prime driver in the decrease in age at onset of breast development,” the authors wrote.  Continue reading