Wis. Stat. § 448.76: Use of titles.

Except as provided in s. 448.72 (1) (e) and (2) to (6), a person who is not a certified dietitian may not designate himself or herself as a dietitian, claim to provide dietetic services or use any title or initials that represent or may tend to represent the person as certified or licensed as a dietitian or as certified or licensed in a nutrition-related field.