Unlike the title dietitian, the titles above are not regulated. This means that any person, regardless of their education and experience, can use them. The RD/LD or RDN/LDN credential is obtained through rigorous training (more on this below)— involving years of academic and clinical work, supervised practice, and continuing education. The path to licensure separates dietitians from other self-proclaimed nutrition professionals and enables dietitians to practice legally in a variety of settings.