Miss. Code § 73-10-7
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 73-10-3(j), or use in connection with his or its name, the titles "dietitian," "dietician" 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 this chapter or meets the exemptions in paragraph (c) of Section 73-10-13. Notwithstanding any other provision of this chapter, 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 shall be licensed according to the provisions of this chapter to practice dietetics or provide medical nutrition therapy.
Miss. Code § 73-10-7