Which method is commonly used to rank individuals by usual intake in large populations?

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

Answer: (C)

For ranking how much people typically eat across a large group, a Food Frequency Questionnaire is the most practical and effective tool. It asks how often and how much of a set list of foods are eaten over a long period, like months or a year, which makes it well suited to comparing usual intake across many individuals. This approach is efficient to administer to large populations and provides a consistent basis for relative ranking of habitual consumption, which is exactly what researchers need in nutritional epidemiology to explore links between diet and health outcomes.

Other methods focus on precise intake over short windows: diet records require people to log everything for several days, delivering detailed but short-term data that is labor-intensive and may not reflect typical patterns; a 24-hour recall captures a single day's intake and is highly variable from day to day, limiting its usefulness for ranking habitual intake; a dietary history can be thorough but is time-consuming and harder to scale to large samples. The Food Frequency Questionnaire, despite its limitations like recall bias and fixed food lists, best serves the goal of comparing usual intake across many participants.