Hospitalised patients with urinary tract infections and impaired oral intake face increased frailty and delayed recovery. This retrospective study evaluated the effects of high-calorie, high-protein, and balanced enteral nutrition formulas on frailty, weight, muscle mass, and length of stay in 165 nononcologic inpatients. Patients receiving high-calorie formulas showed the greatest improvement in frailty scores and the shortest hospital stays. Weight and muscle mass increased across groups, alth