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Early Puberty in Girls Is Becoming Epidemic and Getting Worse

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Girls with early onset puberty face a number of mental and physical health risks.

Padded bras for kindergarteners with growing breasts to make them more comfortable? Sixteen percent of U.S. girls experiencing breast development by the age of 7? Thirty percent by the age of 8? Clearly something is affecting the hormones of U.S. girls—a phenomenon also seen in other developed countries. Girls in poorer countries seem to be spared—until they move to developed countries.

No scientists dispute that precocious or early-onset puberty is on the rise but they do not agree on the reasons. Is it bad diets and lack of exercise that cause growing obesity? Is it soft drinks themselves, even when not linked to obesity? Is it the common chemicals known as endocrine disrupters that exert estrogen-like effects (and also cause obesity)? Is it the many legal, unlabeled hormones used in the U.S. to fatten livestock? Some researchers even believe precocious puberty could be triggered by sociological factors like having no father in the home or even stress.

Puberty in girls is defined by three things: breast development (thelarche), appearance of pubic hair (pubarche) and the onset of menstrual periods (menarche), the latter coming last. In the 1700s, girls did not menstruate until age 17 or 18, and 100 years ago the average age when a girl got her first period was 16-17.

“The reason why weight matters is because when the body senses it has extra calories, enough to sustain a pregnancy, the fat tissues release a signal into the bloodstream,” reports KATU 2 News. “That signal then travels to the brain, telling it that sexual development is a ‘go.’ Doctors see the opposite happen in girls who suffer from anorexia. When the body is starved of calories, the first thing it does is shut down sex hormones.”

Leptin, a protein produced by fatty tissue and believed to regulate fat storage in the body, is also a factor. Fat children have high levels of the protein leptin, which through a complicated chain involving the hypothalamus and pituitary gland, can stimulate the release of the three main hormones in puberty: hypothalamic gonadotropin-releasing hormone, luteinizing hormone and follicle-stimulating hormone which encourage puberty.

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