15 Miss. Code. R. 19-60-3.5.1
It shall be unlawful for any person, corporation or association to, in any manner, represent himself or itself as a dietitian or nutritionist, send out billings as providing services covered in Section 100.03 10, 11, 12, and 13, or use in connection with his or its name, the titles "dietitian" or "nutritionist" or use the letters "LD," "LN" or any other facsimile thereof when he or she is not licensed in accordance with the provisions of these regulations or meets the exemptions set forth in Section 108 herein. Notwithstanding any other provision of these regulations, a dietitian registered by the Commission on Dietetic Registration (CDR) shall have the right to use the title "Registered Dietitian" and the designation "R.D." Registered dietitians must be licensed pursuant to these regulations to practice dietetics or provide medical nutrition therapy.
15 Miss. Code. R. 19-60-3.5.1