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Household size: an overlooked confounder when considering inequalities in food choice

Recent investigations have explored whether psychosocial factors relevant to food choices (e.g. nutrition knowledge, cost concerns) are socioeconomically patterned and whether they mediate dietary inequalities. Consequently, multiple factors have been identified as promising targets for health promotion. However, it is noteworthy that few confounding variables are typically acknowledged in this field of research. Age and gender are generally considered, however household characteristics, such as household size and composition are rarely addressed. Acknowledgement of these factors could be achieved by providing descriptive information on household characteristics, and may not involve more complex solutions such as modelling household variables or computing household-equivalised socioeconomic measures.