The survey asked about 11,000 adults about their eating habits over the past 24 hours. It revealed that, in general, young people and African-Americans consume the most calories in fast food (15 percent for each group).
People who are obese also consume more fast food than their normal-weight peers, the CDC found.
In a separate study released Thursday, the CDC reported that young people consumed fewer calories between 2000-2010. The share of calories from carbohydrates, fats and proteins fell within recommended ranges, the agency said.