<![CDATA[Surgery induces a metabolic stress response that increases energy and protein requirements and accelerates the body’s protein catabolism. This can affect nitrogen balance. Adequate energy and protein intake are essential for maintaining muscle mass, accelerating wound healing, and supporting recovery. This study aims to analyze the relationship between energy and protein intake and nitrogen balance in post-cancer surgery patients at Ulin Regional Hospital, Banjarmasin. A cross-sectional, observational analytical design was conducted from January to March 2026 with 15 respondents (total sampling). Intake was measured through a 24-hour food recall for two consecutive days. Nitrogen balance was calculated using protein intake and 24-hour urine urea nitrogen (UUN) values. Spearman rank analysis was used (). The results showed that the majority of respondents experienced a severe energy (66,7%) and protein (46,7%) deficit, but the majority (73,3%) had a positive nitrogen balance. No statistically significant relationship was found between energy intake and nitrogen balance (p = 0,121). Conversely, there was a significant relationship between protein intake and nitrogen balance (p = 0,016) with a strong positive correlation (r = 0,611). Protein intake is a more influential factor in nitrogen balance than energy intake. Hospitals are advisedto increase monitoring of high-protien diets, and future researchers are advised to increase the sample size and duration of their studies to ensure more representative results. ]]>
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