Final answer:
A certified personal trainer may assist clients with general nutrition guidance but is not qualified to diagnose medical conditions, prescribe medication, or perform surgery.
Step-by-step explanation:
A certified personal trainer may assist clients with general nutrition guidance under their scope of practice.
This includes providing information on healthy eating habits, meal planning, and dietary recommendations to support clients' fitness goals.
However, a personal trainer is not qualified to diagnose medical conditions, prescribe medication, or perform surgery. These responsibilities fall within the purview of medical professionals such as doctors or dietitians.