Evaluating self‐reported retrospective average daily fruit, vegetable, and egg intake: Trustworthy—Sometimes!

Summary

Abstract Retrospective self‐reports are commonly used to assess dietary intake. Yet, their use is criticized as it is unclear whether the underlying assumptions for valid self‐reports are met: Individuals have to consider the behavior of all days in the retention interval and weigh the behavior of all days equally. This study examines whether these assumptions for retrospective self‐reports are met and whether interindividual differences in self‐report performance are relevant regarding these assumptions. Ninety‐two participants aged 18–61 years participated in seven sequential 24‐h recalls and one retrospective 7‐day recall concerning their intake of fruit, vegetables, and eggs. A multiple linear regression approach was used to examine the relation between the daily repo