Agricultural groups and farm state lawmakers last week continued to question a new report on dietary guidelines that, they said, veered into environmental biases and ranged well beyond providing Americans dietary advice.

"Science must drive policy that feeds people all over the world, so we applaud the advisory board for its notable contributions to public health," said Bob Stallman, president of the American Farm Bureau Federation.

"We are, however, concerned that the report’s lengthy foray into sustainability issues goes well beyond both the group’s expertise and its clearly defined mission. Its conclusions would have benefitted from the contributions of agronomists, animal...