Final answer:
A registered dietitian can conduct a 24-hour recall if a 3-day food log is unavailable during an initial consultation with an athlete.
Step-by-step explanation:
If a 3-day food log is not available prior to the initial consultation with an athlete, a registered dietitian can easily conduct a 24-hour recall during the first session. This is a method where the dietitian asks the athlete to recall all the foods and beverages they consumed in the last 24 hours. It helps to provide an overview of the athlete's dietary habits and can be used as a starting point for nutritional guidance.