Dietitians Act Article 55

A foreigner may attend a dietitian examination in accordance with the laws of the Republic of China.When a foreigner passes the examination under the preceding paragraph and receives a dietitian certificate, his/her practice in the Republic of China shall be subject to the approval by the central competent authority. Such a person shall also comply with the applicable laws of the Republic of China in relation to dietitians and medical treatment, as well as the articles of association of dietitian associations. The regulations for the approval and management of such practice shall be established by the central competent authority.In case of breach of the preceding paragraph, in addition to sanctions in accordance with the law, the central competent authority may annul the approval.
中文原文 營養師法第55條
外國人得依中華民國法律,應營養師考試。
前項考試及格,領有營養師證書之外國人,在中華民國執行營養師業務,應經中央主管機關許可,並應遵守中華民國關於營養師及醫療之相關法令及營養師公會章程;其執業之許可及管理辦法,由中央主管機關定之。
違反前項規定者,除依法處罰外,中央主管機關並得廢止其許可。

English translation for reference only; the Chinese text prevails. Not legal advice.