Final answer:
Approximately 10% of the information presented orally will be remembered after 2 weeks.
Step-by-step explanation:
In the context of the question, if the dietetics professional presents new information to an adult orally, approximately 10% of what is heard will be remembered after 2 weeks. This is based on the forgetting curve discovered by German psychologist Hermann Ebbinghaus, which shows that the average person loses around 50% of memorized information after 20 minutes and 70% after 24 hours.