Americans are eating more whole grains than ever before -- but it's still not enough.
Moreover, not everyone agrees on what whole grains actually are, according to a new study that found competing definitions.
The increase in whole grain intake over the past two decades is either 39.5% or 61.5%, according to researchers from the Tufts University Friedman School of Nutrition Science and Policy in Boston.
But by any definition, Americans are not getting the recommended amount of at least 3 ounces daily.