Adequate and appropriate nutritional support for malnourished hospitalised patients plays an important role in reducing the effects of malnutrition in patients and improving patients' immunity to accelerate the healing process and shorten hospital stay. The purpose of this study was to investigate differences in nutrient intake and weight changes in malnourished patients received High Energy High Protein (HEHP) diet with and without nutritional support. This study was a quasi-experimental, pre-post-test design with a control group. In total, 40 malnourished hospitalised patients at RSUD dr. Doris Sylvanus Palangka Raya were allocated to either an intervention (HEHP diet + nutritional support 2 x 100 ml of milk) or a control (usual HEHP diet) group evenly. Data were collected at baseline and within three days of intervention. The changes in patients' weight, energy and protein intake between the control and intervention groups were assessed using two independent sample t-test. Of 40 malnourished patients, mean BMI and age were 16,7 ± 1,4 and 31,2 ± 9,3 years respectively with an even sex distribution of 50% each. The average energy and protein intake of the intervention group were 2129,64 ± 392,20 kcal and 104,85 ± 31,76 grams respectively while in the control group were 1894,58 ± 544,45 kcal and 82,80±26,76 grams respectively. The intervention group experienced weight gain by 1.11 kg within 3 days. In contrary, the control group had slightly increased in weight by 0.32 kg. No significant difference was found in energy intake (p = 0,054). However, there were significant differences found in protein intake (p = 0,022) and changes in weight (p = 0,048). The results show that additional nutritional support use of milk into the usual HEHP diet for malnourished patients is an effective option for improving protein intake and weight gain