The objective of this article is to gain an in-depth understanding of the eating lives of low-income single mothers in Japan. Semi-structured interviews were conducted with nine low-income single mothers living in the three largest urban areas (Tokyo, Hanshin [Osaka and Kobe] and Nagoya) in Japan. Framed by the capability approach and sociology of food, their dietary norms and practices, as well as underlying factors that impact the norm-practice gap were analysed across nine dimensions: meal frequency, place of eating, meal timing, duration, persons to eat with, procurement method, food quality, meal content and pleasure of eating. These mothers were deprived of various types of capabilities, extending not only from the quantity and nutritional aspects of food, but also to spatial, temporal, qualitative and affective aspects. Aside from financial constraints, eight other factors (time, maternal health, parenting difficulties, children’s tastes, gendered norms, cooking abilities, food aid and local food environment) were identified as influencing their capabilities to eat well. The findings challenge the view that food poverty is the deprivation of economic resources required to ensure a sufficient amount of food. Social interventions that go beyond monetary aid and food provision need to be proposed.