Researchers writing in the journal Pediatrics Monday documented earlier and earlier puberty for girls in the U.S. The researchers blamed obesity for the trend and outlined the health risks of it.
Meanwhile, authors Stephen Perrine and Heather Hurlock coined the word “obesogenic” and suggested in a new book that the obesity trend is caused by chemicals like BPA in plastics.
And others, like me, sidestep the obesity question and point out that earlier puberty for females (and later for males) is a logical outcome for a BPA-rich environment. BPA, a synthetic estrogen, is used as an additive in clear plastic bottles, as liner for tin cans, and liberally covers credit card receipt thermal paper. It’s in the tissues of every one of us.
Dr. Frank Biro of Cincinnati Children’s Hospital Medical Center led a team that published its results in the journal Pediatrics on Monday. The team measured breast development in 1,200 girls aged 7 and 8 in New York, Cincinnati, and San Francisco. They compared results with those of a similar study made in 1997. As previously, they found wide disparity based on race, but they found a troubling trend of earlier puberty for all races.
The study found that at age 7, about 10 percent of white girls and 23 percent of black girls had started developing breasts. This compares to 5 percent of white girls and 15 percent of black girls in 1997. Therefore the number of white girls developing at age 7 had doubled, and the number of black girls had gone up by 50 percent.
The researchers suggested that obesity, now an epidemic in America, makes girls more likely to enter puberty earlier. What’s the problem with earlier puberty? It causes depression and may lead to earlier sexual activity. In addition, it increases the individual’s exposure to estrogen and therefore her chance of coming down with breast cancer, said the researchers in the Reuters news article.
To counter the obesity trend and therefore the early puberty trend, families should eat together and eat more fruits and vegetables, said Biro.
However, critics suggest that the obesity trend could be caused by chemicals BPA and phtlalates, both plastics additives that mimic estrogen. Stephen Perrine and Heather Hurlock in their book The New American Diet have coined a new term, “obesogenic,” to describe these to chemicals, saying they cause obesity.
Whether they cause obesity is up for debate, according to The Wall Street Journal editorial (Are Plastics Making Us Fat?, 08/13/10, p. A15). But it certainly appears to me that BPA, created in a lab as a synthetic estrogen, is pretty likely to cause early puberty in girls–and late puberty in boys.
Sources: http://health.yahoo.net/news/s/nm/us_puberty_earlier
The Wall Street Journal, “Are Plastics Making Us Fat?”, 08/13/10, p. A15
Image credit: http://creativecommons.org/licenses/by-sa/3.0/