Food insecurity was prevalent in a cross-sectional study of patients presenting to the Whangarei Hospital emergency department, as assessed using the validated two-item Hunger Vital Sign screening tool. Out of a total of 300 participants, 37% were food insecure. Factors associated with food insecurity included Māori ethnicity (odds ratio [OR] 2.12; 95% CI 1.19-3.80; p = 0.011), household crowding (OR 1.19; 95% CI 1.02-1.39; p = 0.024) and lower socioeconomic status (OR 1.13; 95% CI 1.00-1.27; p = 0.048). The primary reason for emergency department attendance or the number of comorbidities were not significantly associated with food insecurity. Only half of participants who were food insecure reported being aware of (50.5%) or had used (54.1%) food resources. Food insecurity was associated with interest in social worker follow-up (OR 16.95; 95% CI 5.81-49.42; p < 0.001). The study authors concluded that an emergency department-based food insecurity screening programme with voluntary social worker follow-up was feasible and acceptable to patients.