Which dietary assessment method is particularly prone to underreporting due to memory reliance and social desirability?

• A. Diet Records
• B. 24-Hour Diet Recall
• C. Food Frequency Questionnaire
• D. Dietary History

Answer: (B)

Memory and social desirability are key factors that affect how accurately people report what they eat. A 24-hour recall asks you to recount everything consumed in the previous day, and accuracy hinges on remembering every item, portion size, and ingredient. People often forget snacks, beverages, sauces, or small additions, and they may misjudge portion sizes. At the same time, social desirability can lead to underreporting foods viewed as unhealthy in order to present oneself in a better light. Because this method relies entirely on memory for a single day, these memory lapses and the desire to look good together make it particularly prone to underreporting.

Other methods approach reporting differently. Diet records are kept in real time, which reduces memory errors but can be burdensome and may alter eating behavior. Food frequency questionnaires assess usual intake over longer periods, reducing the impact of a single-day memory error, though they rely on general patterns and recall over weeks or months. Dietary history gathers information about typical intake over a longer span and is less about a single day, so the memory challenges are different.