High-Protein Nutritional Supplements Improve Nutritional Status in Malnourished Patients with Systemic Sclerosis

(1) Background: Impaired nutritional status in systemic sclerosis (SSc) is prevalent. (2) Objective: This study aimed to identify pre-cachexia and malnutrition in SSc patients and to estimate the effectiveness of a high-protein oral nutritional supplement (ONS) in improving their nutritional status. (3) Materials and methods: The SSc population comprised 56 patients and a control group of 49 healthy persons. After a baseline clinical evaluation, bioelectrical impedance analysis (BIA), and laboratory tests, SSc patients were divided into well-nourished, pre-cachectic, and malnourished categories. SSc patients with a nutritional disbalance received a high-protein ONS once daily for 3 months. Patients were reassessed at 3 and 12 months after inclusion in the study. (4) Results: SSc patients, in comparison to the control group, had a significantly lower seven-point SGA value [6(0) vs. 7(1), <i>p</i> < 0.001)], lean tissue mass [LTM, 35.1 (10.5) vs. 40.1 (10.10), <i>p</i> = 0.008], and lean tissue index [LTI, 13.5 (3) vs. 14.9 (4), <i>p</i> = 0.009]. Of the 56 SSc patients, 40 (71.4%) were well nourished, 5 (8.9%) had pre-cachexia, and 11 (19.7%) were malnourished. A high-protein ONS in the pre-cachexia group stabilized the SGA value, anthropometric measurements, and BIA after 3 and 12 months. In malnourished patients, it significantly improved the SGA value [5(0) vs. 6(0), <i>p</i> = 0.002], LTI [12.1 (2.1) vs. 12.7 (3.2), <i>p</i> = 0.021] and LTM [31.1 (7.7) vs. 35.1 (9.1), <i>p</i> = 0.021], and that effect remained stable at 12 months. (5) Conclusion: Malnutrition is a common complication of SSc that can be improved with nutritional intervention.