Two sections slipped into the US Senate version of the farm bill just before its passage are attempts to encourage the expansion of irradiated food in the US diet, say consumer advocacy group Public Citizen. Public Citizen has waged a two-year campaign to halt further approvals of irradiated food by the federal government, arguing that the Food and Drug Administration (FDA) has not followed its own protocols when approving irradiation to treat foods, and that emerging research on chemical compounds formed when certain foods are irradiated indicate that they may be harmful to humans.