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.
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