For additional information on becoming a medical nutrition therapist/registered dietitian, visit these websites:

With nearly 65,000 members, the American Dietetic Association is the nation’s largest organization of food & nutrition professionals. ADA serves the public by promoting optimal nutrition, health & well-being.
http://www.eatright.org/

The CDR is the credentialing agency for the American Dietetic Association, and has sole and independent authority in all matters pertaining to certification.
http://www.cdrnet.org/