Using the 5% per decade rule, what is the expected calorie reduction for a 60-year-old compared to a 50-year-old?

• A. Approximately 5% reduction, because 60 is one decade after 50.
• B. Approximately 25% increase, because older adults require more calories to maintain metabolism.
• C. Approximately 15% reduction, because you multiply 5% by three decades.
• D. No reduction, because caloric needs do not change until after age 70.

Answer: (A)