The average age of the onset of puberty has been dropping in the last century—with some girls starting to develop breasts as early as age six or seven. These shifts in the reproductive development ...

Add Yahoo as a preferred source to see more of our stories on Google. The most significant breast changes are the result of hormone fluctuations, say experts. (Photo illustration: Ivana Cruz for Yahoo ...

Recreational physical activity may be associated with breast tissue composition and biomarkers of stress in adolescent girls, according to a new study from Columbia University Mailman School of Public ...

Studies have shown higher levels of recreational physical activity -- being physically active during leisure time such as through sports, gym or dance -- are consistently linked with a lower risk of ...

A study of Black and Hispanic adolescent girls shows that even modest participation in organized sports is associated with favorable breast tissue composition and lower oxidative stress, highlighting ...