Eating burgers from restaurants associated with higher obesity risk in in African-American women

Americans are increasingly eating more of their meals prepared away from home, and this is particularly true among African Americans, who also have higher rates of obesity than other Americans. Young adults tend to eat out more often at fast-food restaurants and these establishments are more often found in minority neighborhoods. A few studies have shown that frequently eating out is associated with greater weight gain than eating at home, but little previous research has focused on whether specific types of foods eaten at fast-food and full service restaurants have a greater effect.

A research team from Boston University's Slone Epidemiology Center examined the association between consumption of foods from restaurants and risk of becoming obese in a large cohort of young African American women. Their results, published online today in Ethnicity & Disease, provide evidence that frequently eating hamburgers from restaurants is associated with higher risk of . Higher intake of sugar-sweetened , which are commonly consumed together with restaurant foods, was also independently associated with obesity risk.

This study was conducted using data from the Black Women's Health Study, an ongoing investigation of the health of 59,000 African American women that began in 1995. The analysis included younger women, aged 21 to 39 years, because most weight gain occurs before middle age. The women studied were not obese and had no history of cancer or cardiovascular disease at the start of follow-up. Diet was assessed twice (in 1995 and 2001) using validated questionnaires, and information on the participants' weights was collected every two years from the study's start until 2011. The researchers examined the relationship of consumption of restaurant foods and sugar-sweetened soft drinks with risk of developing obesity (defined as body mass index 0 kg/m2).

The researchers found that women who ate burgers from restaurants at least twice a week were 26 percent more likely to become obese by the end of the study than those who rarely ate burgers, after controlling for many factors including overall diet quality and sugar-sweetened soft drink consumption. In addition, women who drank at least two sugar-sweetened soft drinks per day were 10 percent more likely to become obese than those who drank none, after controlling for overall diet quality and restaurant burger consumption.

The authors concluded that, "the identification of individual foods or beverages that are associated with provides a basis for specific and straightforward recommendations to help prevent obesity."

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