Fast food accounted for about 11 percent of American adults' daily calorie intake from 2007 to 2010, a decrease from previous years, according to news sources.
The National Center for Health Statistics released the findings from the National Health and Nutrition Examination Survey on Thursday.
The survey found that the daily fast food calorie percent has decreased since 2003-2006, when it was almost 13 percent, according to Health Day.
The largest decline was in 40- to 59-year-olds, said Cynthia L. Ogden, a C.D.C. researcher who oversaw the research, according to the New York Times.
The study also found that about 20 percent of the calories consumed by non-Hispanic black adults ages 20 to 39 are from fast food, as reported in the brief on the C.D.C. website.
"Fast food is a fact of life, so we need to find ways we can live with it, not die from it," said Samantha Heller, a clinical nutritionist at the NYU Center for Musculoskeletal Care in New York City, as reported by Health Today.
"We need to encourage fast-food establishments to have a variety of healthy offerings that are marketed as cool, sexy, fun and delicious," Heller said to Health Today.
Additional findings from the survey can be found on the Centers for Disease Control and Prevention website.