The health education in schools became the focus of public attention during the global pandemic of COVID-19. Teaching practice changed to meet the increased demand for pupils' health, triggering a reevaluation of higher education curricula for pedagogical students. Therefore, this mixed methods study aimed to investigate the lifestyle of university students of pedagogy in Slovenia during the COVID-19 pandemic. One hundred and four students (87.4% females and 12.6% males) met the criteria and participated in an online survey in which they self-assessed their physical activity, eating habits, mental well-being, and sleep quality. The convergent parallel mixed methods design was used to obtain qualitative descriptions of student experiences with lifestyle domains and quantitative data on their attitudes towards the impact of lifestyle on physical and mental well-being during the pandemic. The results suggest that the pandemic did significantly impact student lifestyles, especially their mental well-being. Although most students maintained a healthy lifestyle during the pandemic, they also reported a deterioration in other measured domains of health-related behaviour. Particular attention should, therefore, be paid to the curriculum of pedagogical students to develop their competences in health education and readiness to assume an active role as educators for their future pupils' health.