Purpose: College and university campuses serve as a vital test bed for sustainability solutions of various types. To date, though, campus sustainability efforts have focused more on the environmental and economic aspects of sustainability, with less attention to its social aspects. This paper aims to draw on a study of student food insecurity to consider how sustainability's three pillars might be more holistically engaged. Design/methodology/approach: First, the paper reviews the literature on-campus food sustainability and student food insecurity to propose a preliminary characterization of sustainable food. Second, data from a study of food insecurity among students at a major research university are presented. The survey data measure the degree and attributes of food insecurity among undergraduate and graduate students. The focus group and interview data provide a detailed understanding of students' experience with food insecurity, particularly with regard to how that experience resonates with the characteristics of sustainable food. Finally, the paper suggests that the systems thinking approach may be the best way to engage the social pillar of sustainability. Findings: Food insecurity is prevalent among university students. These students find affordability and nutrition to be the most important characteristics of the diets they desire to have. The ability to access such foods conveniently is also important, whereas the sourcing of foods is not resonant. Research limitations/implications: This is a study of a single campus in the USA. Findings may be different on campuses that have different demographics and other characteristics. Originality/value: Campus sustainability efforts must fully engage the social aspects of sustainability. This paper uses the example of food and food insecurity to show how and why this is important. It also points to systems thinking approach as appropriate for this holistic effort.