The brain on steroids

From Scientific American:

Yet there are millions of cases of steroid use that occur daily with barely a second thought:  Millions of women take birth control pills, blithely unaware that their effects may be subtly seeping into and modulating brain structure and activity.
....
The possibility that an accepted form of chemical contraception has the ability to alter the gross structure of the human brain is a cause for concern, even if the changes seem benign -- for the moment. 

It is ironic that so many people are so concerned with minute traces of man-made chemicals in the environment but think nothing of dousing themselves with huge dozes of man-made chemicals that are prescribed by their doctors.