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What's more, those overweight teens who do use some form of contraception are less likely than their normal-weight peers to use it regularly, the researchers said. In both cases, obese teens are at greater risk for an unintended pregnancy, the research from the University of Michigan found.
"The U.S. teen pregnancy rate is one of the highest in the developed world and we know pregnant adolescents are more likely to have poor birth outcomes," said the study's lead author, Dr. Tammy Chang, an assistant professor of family medicine at the U-M Medical School and a member of the U-M Institute for Healthcare Policy and Innovation, in a university news release.
"Reducing adolescent pregnancy is a national public health priority and we need to understand which adolescents are at higher risk of pregnancy. Our findings suggest that obesity may be an important factor associated with adolescent women's sexual behavior," she added.
The study was published July 1 in The Journal of Pediatrics.
The study involved 900 young women between 18 and 19 years old who wrote weekly journal entries on their sexual activities and use of birth control. The researchers used these journals to see whether the teens' weight influenced their sexual behavior.
The study didn't find any differences in other sexual behaviors between obese teens and their normal-weight peers, such as how often the teens had sex or how many partners they had.
The researchers suggested that low self-esteem might prevent obese teens from asking their doctor or pharmacist for contraceptives. And certain risk factors associated with obesity, such as the ability to understand basic health information, could also play a role, they noted.
"By understanding the barriers that put certain groups of teens at higher risk of unintended pregnancies, clinicians and researchers can tailor interventions to empower adolescents to make healthier sexual choices," Chang said.
In the United States, one in four women gets pregnant at least once in her teens. Women who give birth as teens have a higher risk of adult obesity, previous research found.
"Understanding sexual behaviors by weight status among adolescents is critical because of the risk of dangerous outcomes for moms and babies associated with obesity," said Chang.
-- Mary Elizabeth Dallas
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