Abstract Background A Western dietary pattern characteristics was suggested to have a role in the pathogenesis of ulcerative colitis (UC). Poor dietary pattern can exacerbate the patients’ symptoms and lead to significant nutrient deficiencies. However, data regarding dietary habits and nutritional needs are scarce. Our study aimed to prospectively evaluate dietary intake and habits in peadiatric patients with UC at a Spanish tertiary hospital. Methods In this prospective observational study, peadiatric UC patients were followed up, during which their dietary habits were collected. Patients were asked to complete the KIDMED questionnaire for adherence to the Mediterranean diet (MD) and a 3-day food diary. The degree of food processing was assessed using the NOVA classification system, which classifies all food products into four main groups. Results A total of 47 patients were included, with a mean age of 11.9±3.3 years (57% female), and a median follow-up of 2.8±5.4 years. The mean caloric intake was 1919.07 ± 292.8 kcal, and 55.31% of patients did not cover their energy requeriments. Protein and saturated fat intake exceeded the recommended daily intake (RDI): mean protein intake was 2.13±0.8g/kg (239.06% of RDI), and saturated fatty acids was 31.65±7.9% of total fat. In contrast, fiber, calcium and iron intake were below recommendations: mean fiber was 13.44±2.9g (75.1±24.7% of RDI), calcium was 457.7±239.3mg (41.6±26.2% of RDI) and iron 8.3±3.4mg (75.3±37.2% of RDI). The average KIDMED score was 6.2 points, with only 15 patients (31.9%) presenting high adherence to the MD. Of the remaining patients, 26 (55.3%) needed to improve their diet quality, and 6 (12.7%) had very low diet quality. Regarding the NOVA classification, 7 patients (14.9%) consumed more than 40% of their total energy from ultra-processed foods (NOVA 4), while 23 (48.9%) had less than 40% of their energy intake coming from unprocessed or minimally processed foods (NOVA 1). Conclusion Our results highlight that a substantial proportion of pediatric UC patients have suboptimal dietary patterns, characterized by high intake of UPF and saturated fats, alongside low intake of fiber, calcium, and iron. These findings suggest a need for tailored follow-up with a specialized dietitian within the multidisciplinary care team. Further research is essential to clarify the impact of diet on UC.
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