Can childhood obesity lead to early puberty?

A problem associated with overweight and obese children is early-onset puberty. In recent years, the number of elementary-school girls who look like high-schoolers and middle-school girls who look like they attend the local college has grown. Pediatricians nationwide are seeing girls 5 to 10 years old with breasts and pubic hair in alarming numbers -- one out of seven white girls and an astonishing one out of every two African Americans.

Though the reasons for this phenomenon are still being researched, experts see possible links to obesity, to the pesticides sprayed on fruits and veggies, and to hormones in beef and in cow's milk. The link to weight seems a strong one, although it is not yet well understood. We have known for a while that very overweight girls start maturing earlier than their thinner peers, and it now appears that mildly overweight girls may be experiencing this early maturation as well.

Dr. Paul Kaplowitz, a pediatric endocrinologist at the Virginia Commonwealth University School of Medicine, believes that the link between obesity and early maturation may be related to the hormone leptin. Since fat cells produce leptin, and since leptin is necessary for the progression of puberty, he believes the overweight and obesity epidemic may help to account for the growing numbers of preteen girls showing signs of early breast development. Another possible link between obesity and early puberty: Overweight girls have more insulin circulating in their bloodstream, and higher levels of insulin appear to stimulate the production of sex hormones from the ovaries and the adrenal glands.

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