The center shall ensure that each participant who is present for 4 or more hours is provided with a meal that meets 1/3 of the recommended dietary allowance of the Food and Nutrition Board of the National Research Council. The center shall provide snacks consisting of a nourishing food or beverage, or both, to participants. The minimum number of meals and snacks shall be provided as follows: A center may prepare food on-site if the center meets the requirements of COMAR 10.15.03. The center shall ensure that food prepared off-site from the center is prepared in a center which meets the requirements of COMAR 10.15.03. Therapeutic diets approved by a registered and licensed dietitian shall be served only as ordered. Staff shall assist participants who may be unable to feed themselves, in accordance with the ADCAPS. A Registered Dietitian shall perform a nutritional assessment for all participants with a potential, or an actual, nutritional deficit.