PurposeThis study aimed to know principals' intentions of implementing nutrition education (NE) and explore the challenges they may anticipate while implementing NE in their respective schools.Design/methodology/approachThe study employed a sequential mixed-method design using a questionnaire and interviews to collect data. The quantitative data were collected from 378 secondary school principals, while 16 school principals were interviewed.FindingsThe study found principals with positive intentions towards implementing NE. The results also highlighted challenges related to capacity building, resources (both human and physical), policies and plans, roles, and responsibilities of the implementers (teachers and principals), support from higher authorities, community participation and teachers' unions. This study concludes that principals' intentions remain central to the implementation of NE in schools. However, it is necessary to overcome those challenges before its implementation.Research limitations/implicationsThe study sought to ascertain principals' intentions rather than their actual behaviour of NE implementation and hence remains limited in this area, which future research may consider. Furthermore, the research is limited to the principals' opinions on the anticipated challenges associated with NE implementation. The study did not solicit the opinions of other stakeholders, such as education managers, policymakers, teachers and communities.Originality/valueThe article is significant in terms of NE being implemented in schools to improve students' physical and academic wellbeing. The critical role of principals has been investigated by determining their intentions and the anticipated challenges associated with implementing NE. The authors declare the originality of the data.