Speaking of changes in appearance in adults and preteens/teens...

Has anyone noticed how young men and women are bigger (both tall and round) with especially women being more developed (upstairs dept.)? I seriously wonder if what we are eating is messing us up and what the long term rammifications are?!?!?!? I have heard of girls like 10 or around there having cycles or getting pregnant. I don't buy the whole 20 century evolution crap. I really wonder what affects food, water, and hormones are going to do for the human race for the long term??? Scary...