(b) No person may use any title, sign, card or other device which indicates that such person is a licensed dietitian unless expressly authorized and licensed pursuant to the provisions of this article: Provided, That a dietitian registered by the commission on dietetic registration may use the title of registered dietitian: Provided, however, That the requirements and provisions of this article do not apply to any person employed as a cook at any public or private educational institution in this state.
(c) Nothing in this article may be construed to affect individuals who furnish nutrition information on food, food materials or dietary supplements or who engage in explanation to customers about food, food materials or dietary supplements in connection with the marketing and distribution of those products, and who do not use the title "dietician" or "licensed dietician."