Girls Who Begin Dieting Twice as Likely to Start Smoking

Starting to diet seems to double the odds a teenage girl will begin smoking, a University of Florida study has found.

UF researchers, who analyzed the dieting and smoking practices of 8,000 adolescents, did not find the same link in boys, who were also less likely than girls to diet, according to findings released Friday in the American Journal of Health Promotion.

“Dieting was a significant predictor of initiation of regular smoking among females,” says Mildred Maldonado-Molina, a UF assistant professor of epidemiology and health policy research and lead author of the study. “We were expecting that this relationship was going to be stronger among females. That has been well-documented, especially because (nicotine) can suppress your appetite.

“In boys we found something we don’t understand yet,” she says. “We found that those who were inactive dieters, those who first started dieting and then stopped, were more likely to engage in smoking behaviors.”

The researchers derived their findings from the answers of 7,795 adolescents who were surveyed during the first two waves of the National Longitudinal Study of Adolescent Health, completed in 1994 and 1996. The teens were in seventh, eighth and ninth grade when surveyed.
UF researchers included the answers of adolescents who said they were trying to lose weight and divided the group into four units: non-dieters, new dieters, former dieters and consistent dieters, who said they were dieting both times they were surveyed. They excluded teens who were already smokers and those who admitted to taking diet pills, vomiting and using other unhealthy weight-loss tactics.

“That group (of teens who were beginning to diet) was the one we were most interested in, seeing how the start of one behavior related to initiation of smoking,” Maldonado-Molina says.
Researchers also found that girls who consistently dieted were more likely to smoke.

Still, the number of children smoking in the United States has dropped in the 10 years since the first two waves of the survey were completed. In 1995, about 35 percent of high school students smoked regularly, according to the Centers for Disease Control and Prevention. Now about 23 percent of high-school age children reportedly smoke and 8 percent of middle school students do. The percentage of girls who smoke is slightly higher in both age groups, according to a 2006 CDC report on tobacco use among youth.

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