The obesity problem has reached a critical level and is threatening not only personal health but also public health systems around the world. Obesity in young adults is especially rapidly growing and many studies have confirmed that the best prevention is developing healthy eating habits with the improvement of food and health promotion literacy competencies. In this context, this study diagnoses the present levels of food literacy and health promotion literacy among young adults and explores the relationships between both literacies and their healthy eating habits. A total of 325 young adults in South Korea participated in this research, and the results are as follows. First, all food literacy components, which are food and nutrition knowledge, food skills, and resilience, are positively associated with healthy eating habits. Second, health promotion literacy is also positively associated with young adults’ healthy eating habits. Lastly, unlike the primary information sources, gender has a moderating effect on the relationships between both literacies and healthy eating habits. This indicates that the government and educational sectors should propose more policy supports and solid education systems in order to help young adults develop their food and health promotion literacies for overall well-being in the future.

Due to the COVID-19 pandemic and industrialized food systems, people’s eating behavior has become seriously restricted. Especially, university students have started to overly depend on processed foods and carnivorous diets, and it places a huge burden on society by inducing the deterioration of health and environmental sustainability. Therefore, this study was undertaken to examine the effects of university students’ perceived food literacy on ecological eating behavior towards sustainability. A total of 395 university students in South Korea participated in this research. First, students’ food literacy components, which are reading labels and budgeting, healthy snack styles, healthy food stockpiling and resilience and resistance, exert positive influences on ecological eating behavior; second, the other two components, which are food preparation skills and social and conscious eating, have no positive impact on ecological eating behavior. Finally, the influences of food literacy on ecological behavior are significantly moderated by gender differences. This suggests that strengthening university students’ food literacy through education is necessary to promote ecological eating behaviors and advance the development of sustainable society.