Abstract
OBJECTIVES: This study aimed to investigate the intake of ultra-processed foods (UPF) and dietary behaviors in Korean adolescents. METHODS: This study used 24-hour dietary recall data from the Korea National Health and Nutrition Examination Survey (2019-2023). In total, 1,720 adolescents aged 12-18 years were included in this study and categorized into quartiles based on the percentage of energy intake from the UPF. Nutritional status, contributing subgroups of UPF intake, and healthy dietary practices were examined using Health Plan 2030 indicators across quartiles of UPF intake. RESULTS: The nutrient intake of protein, vitamins (A, B1, B2, niacin), and minerals (iron, potassium) was the lowest in the fourth quartile of UPF intake compared with the first quartile (P for trend < 0.001), whereas calcium intake increased across quartiles, from 47.68% in the first quartile to 58.51% in the fourth quartile (P for trend < 0.001). The main contributing subgroups to UPF intake differed across quartiles of UPF intake, and the highest contributing subgroups were 'instant noodles and dumplings,' 'desserts, cakes, and ice cream,' and 'sauces and seasonings.' Healthy dietary practices were the lowest in the fourth quartile (22.18%, P < 0.001), and the proportions of appropriate fat and fruit/vegetable intake were significantly lower in the higher quartiles of UPF intake (P < 0.001). CONCLUSION: This study suggests that a lower UPF intake was associated with better nutritional status and healthy dietary practices in Korean adolescents. These findings provide fundamental evidence for promoting healthier food choices and balanced dietary practices.