the Dietary Reference Intake values to represent the most up-to-date understanding of nutritional science. The Joint United States-Canada Dietary Reference Intake Working Group should initiate at least one Dietary Reference Intake update per year and identify updates which are of highest priority which necessitate review. (6) Exclusion The information and guidelines contained in each report required under paragraph (1) shall not be based on or include topics which are not relevant to dietary guidance, including taxation, social welfare policies, purchases under Federal feeding programs, food and agricultural production practices, food labeling, socioeconomic status, race, ethnicity, culture, or regulations relating to nutrition.