I am with Kathy Lauren and the DES theory. Theory only because the government has not, will not test it because of the implications it lays at the feet of Doctors and drug companies. The women born of mothers who took DES have already won an award to the cancers they got from the drug. The men born to DES mothers cannot get the same opportunity due the amounts already paid out. Plus it dispels the notion that we chose to be transgender. If this were proven, what would happen to Christianity. It is estimated over 10 million women (mothers) were treated with DES from 1937 to 1972 with an equal number of men and women, 1.5 million. The rise of estrogen substitutes in food products such as dairy and salmon. I didn't drink soda as a kid I drank lots and lots of chocolate milk.
Sex hormones and early puberty
IGF isn't the only hormone found in the food supply. Ranchers have been fattening up cattle with sex hormones—most notably estrogen—since the 1950s. Today most beef cows in the U.S.—except those labeled "organic"—receive an implant in their ear that delivers a hormone, usually a form of estrogen (estradiol) in some combination with five other hormones. (These hormones are not given to chicken and pigs because they don't have the same growth-promoting effect in these animals, although antibiotics are given to all three species for similar growth-promoting reasons.)
One concern is that such hormones may spur earlier puberty in children, who are, on average, entering puberty at a younger age than they did a generation or two ago, for reasons that are unclear.