[1] The 24-hour diet recall relies on a trained interviewer, an accurate memory of intake, an ability to estimate portion size, and the interviewee's reliability to not misreport.
The open-ended nature of the interview is intended to help produce the most detailed description of foods and drinks consumed over the previous 24 hours.
[1] A 2013 study determined that the 24-hour multiple-pass recall is a sufficient method for assessing dietary intake of toddlers of Iraqi or Somali born mothers in Norway.
[1] As the recall is memory dependent, there may also be bias in respondents over or under reporting good/bad foods, or poorly estimating portion sizes.
[7] The 24-hour diet recall is a poor method for measuring intake for food or drink with a high day-to-day variability.