According to a recent survey, 7 percent of Americans believe chocolate milk comes from brown cows.

The survey was conducted by the Innovation Center of US Dairy in April. A thousand adults were asked questions about the role milk plays in their daily lives, Food & Wine reported.

The study found 48 percent of respondents weren’t sure where chocolate milk came from. Seven percent thought chocolate milk only comes from brown cows.

That adds up to about 16.4 million people, more than the population of Ohio.

The Washington Post linked the study to past studies that consistently show many Americans have no idea where their food comes from.

For example, a study in the 1990s found that nearly 20 percent of people did not know hamburgers are made from beef.