Final answer:
The Centers for Medicaid and Medicare Services (CMS) sets the mandated guidelines for meals in long-term-care facilities that receive Medicare and Medicaid funding.
Step-by-step explanation:
The agency that sets the mandated guidelines for meals in long-term-care facilities that receive Medicare and Medicaid funding is the Centers for Medicaid and Medicare Services (CMS).
CMS is a federal agency within the U.S. Department of Health and Human Services.
They are responsible for ensuring that healthcare facilities, including long-term-care facilities, meet certain standards and regulations in order to receive funding from Medicare and Medicaid.