The aim of the study was to validate a food frequency questionnaire (FFQ) measuring seafood intake among young adults in Europe. Participants from Iceland, Spain and Ireland (n = 56), aged 20-40, filled out a pre-coded FFQ on seafood. One week after filling out the questionnaire, the participants started a 7-14-day food record (FR). The FFQ was found suitable to rank young adults according to their customary intake of fish and fish oil, but it overestimated the amount consumed. The FFQ could be used as a tool to identify high- and low-fish consumers. (c) 2007 Elsevier Ltd. All rights reserved.