The objective of this paper is to establish a theoretical foundation for food education in schools. Amartya Sen’s capability approach (CA), an ethical theory concerning the freedom required to achieve one’s well-being, was applied to define the previously unchallenged ethical nature of food education. The analyses were informed by foundational CA concepts, Sen’s own perspectives on ‘food’ and ‘education’, and CA-based education studies. Through these analyses, the fundamental nature of food education was defined as follows: ‘Capability to eat well’ is (...) the freedom to convert commodities (such as food or pocket money) into the ‘functionings to eat well’ that constitute children’s ‘well-eating’ (Definition 1); and the objective of food education as public policy is to expand such capability to eat well (Def. 2). However, if an appropriate pedagogy is not employed, children’s capability can be reduced (Def. 3); therefore, to avoid this, the pedagogy has to enable them to perceive more ‘associations’ (in a Deweyan sense) between related conversion factors (Def. 4), as well as to choose and participate in the educational process (Def. 5). This theory not only elucidated the ethical nature of food education but also expanded the scope of the application of the CA to food issues. (shrink)