Which dietary assessment method is best for capturing both how often foods are eaten and the typical portion sizes over an extended period?

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

Answer: (D)

For capturing how often foods are eaten and typical portion sizes over an extended period, you need a tool that estimates habitual intake across many foods using standardized portions. A Food Frequency Questionnaire is designed to do exactly that: it asks how often each food is consumed over a long window (months to a year) and uses typical portion sizes for those foods, allowing an estimate of usual daily intake. This makes it efficient for assessing long-term eating patterns across a broad range of foods.

In contrast, diet records require detailed logging of every item for a short span, providing precise short-term intake but not the usual long-term pattern unless you monitor for a very long period. The 24-hour recall focuses on one day and would need multiple administrations to approximate usual intake, which can be cumbersome. A dietary history looks at patterns and portions as remembered over a longer term but can be less standardized and more susceptible to recall bias. Among these, the Food Frequency Questionnaire best balances the need to capture both frequency and typical portion sizes over an extended period.