Editorial. Excerpt: Assessing dietary intake with precision is a challenging endeavor due to a variety of factors. Notably, individual intake is subject to greater intraindividual variability than interindividual variability in a population, and dietary intake is a frequent and unmemorable occurrence. As such, people are often not valid reporters of dietary intake and subjective measures can have considerable sources of bias. Objective biomarkers of dietary intake provide a dietary assessment strategy that is independent of recall or reporting. See corresponding article (Shinn et al.).