Hormones in fatty foods (meat, milk, cheese) and an increase in childhood obesity are probably causing this.
Not surprising in the least.
Disturbing, but not surprising.
A friend of mine is a single dad raising his daughter, who will be twelve next month. Her mother (my best friend) died three years ago. I feel for him having to figure out a way to teach her about her cycle, if he hasn’t had to already.
I suspect the increased inclusion of soy in many food products has contributed to early puberty.
http://www.scientificamerican.com/article.cfm?id=soybean-fertility-hormone-isoflavones-genistein
http://www.soyonlineservice.co.nz/articles/children.htm
And, naturally:
http://www.freerepublic.com/tag/soy/index
Oh, like the training bra?