(c) All Rhode Island elementary, middle, and high schools that sell or distribute competitive foods and beverages on the school campus during the school day shall be required to offer only healthy foods and beverages as set forth by the United States Department of Agriculture under the Healthy, Hunger-Free Kids Act of 2010, Pub. L. No. 111-296, 42 U.S.C. § 1758 et seq., and federal regulations implementing the act promulgated pursuant to the provisions of 42 U.S.C. § 1779(b). Provided, the Rhode Island board of education or local school committees may adopt more restrictive policies than the ones referenced herein.