What is the typical duration for dietary intake records?

• A. 3 to 7 days.
• B. 1 to 2 days.
• C. 14 days.
• D. 30 days.

Answer: (A)

Capturing usual dietary intake requires a window that is long enough to reflect day-to-day and weekday–weekend variation, but not so long that the recording becomes burdensome or biased. Three to seven days provide a representative slice of intake across different days without overwhelming the participant, helping to balance accuracy with practicality. If you only collect one or two days, you risk miss­ing key variations in meals and snacks that happen from day to day. On the other hand, extending records to 14 or 30 days tends to reduce compliance, increases participant fatigue, and can lead to changes in eating behavior simply because people know they’re being observed, which can distort the data.