Adult picky eating (APE), the rejection of familiar and unfamiliar foods leading to a diet with limited variety, is an understudied phenomenon which can have both physical and mental negative consequences. There is not one gold standard in the measurement of APE yet. Therefore, in the proposed study, 260-400 participants aged 18 and above will fill out a questionnaire that measures (different elements of) APE. Different elements of a Dutch Food Preference Questionnaire (FPQ) will be correlated with different scores on other, more specific measures of adult picky eating, to investigate which elements of APE can be measured with the FPQ. Thus, the research question is: which elements of APE can be measured with an extensive food preference questionnaire, and how do the scores on these elements relate to other, more specific measures of APE? ...