Which factor most often creates underestimation of intake when people self-report food records for energy balance calculations?

• A. Overestimating the number of meals because people usually count water as a food source.
• B. Using food labels always eliminates all error sources, so underestimation is rare when labels are available.
• C. Leaving out snacks, condiments, or underestimating portion sizes results in underreporting of total intake.
• D. Self-reporting always overestimates intake because people deliberately inflate numbers to seem healthier.

Answer: (C)