Background:Gastrointestinal involvement(GI) is a common feature of systemic sclerosis(SSc) and can be highly disabling, representing a major cause of morbidity and reduced quality of life(QoL). The impact of dietary habits on GI symptoms, mood and QoL has not been extensively evaluated.Objectives:To evaluate the adherence to the Mediterranean Diet(MD) in an Italian multicenter cohort of SSc patients, and its impact on GI symptoms and other disease features, depression, anxiety and overall QoL.Methods:Consecutive SSc(ACR/EULAR2013) patients from 4 Italian cohorts were enrolled. Dietary habits and adherence to the MD were assessed using the 14-item MEDAS and QueMD questionnaires. Presence and severity of depressive/anxious symptoms and QoL were evaluated with the Hospital Anxiety and Depression Scale(HADS) and the SSc-HAQ(S-HAQ). GI symptoms were assessed with the Reflux Disease Questionnaire(RDQ) and the UCLA SCTC GI Tract 2.0 questionnaire(USG). Associations with patients’ lifestyle, disease characteristics, and nutritional status were explored.Results:265 patients (94.7% females; age 55.8±13.6years; disease duration 9.1±7.0years; diffuse SSc 31.8%; Scl70 + 35.8%;ulcers 23.4%;ILD 29.4%;BMI 23.7±4.4 Kg/m²; obese 11.3%,overweight 23.4%,underweight 4.9%) were enrolled.Overall MD adherence was moderate(7.5±1.9) according to MEDAS and it correlated with QueMD score(4.53±1.96)(R=.371,p<0.001). MD adherence was optimal in 39 patients(14.7%), more frequently from Central-Southern Italy(p=0.036); 189 patients(71.3%) had a good and 37(14.0%) a poor MD adherence.GI symptoms were moderate/severe according to USG in 37(14.0%) patients(USG:0.41±0.40), and heartburn was the most common GI symptom(35.2%). The prevalence of significant anxiety and depression was 24.1% and 17.0%.An inverse correlation was found between MD adherence and mood disturbances at HADS(MEDAS; R=-0.181,p=0.04), work impairment(QueMD;R=-0.247,p=0.005) and reduced QoL, both for GI (constipation at USG: R=-0.133,p=0.032) and general S-HAQ items(bowel:R=-0.181,p=0.04;severity R=-0.202,p=0.01;Raynaud:R=-0.217,p<0.001;ulcers: R=-0.207,p=0.01). MD adherence directly correlated with lung function(MEDAS;R=0.181,p=0.023 for FVC and R=0.170,p=0.03 for DLCO). Patients with MD optimal adherence had lower HADS depression(p=0.04) and S-HAQ scores(HAQ,p=0.04; Raynaud,p=0.005; ulcers,p=0.02) and lower work impairment and lost work time(p=0.03). No significant correlation emerged between MD adherence and BMI, or specific symptoms. Depression and anxiety directly correlated with the severity of reported upper GI symptoms according to both scales (RDQ-GERD:R=0.261,p=0.001; USG:R=0.263,p<0.001) and general S-HAQ items (HAQ: R=0.136,p=0.032;severity R=0.233,p<0.001;bowel: R=0.135,p=0.04;breath: R=0.133,p=0.03; ulcers: R=0.132,p=0.037). Results were confirmed after exclusion of psychiatric(11.7%) and fibromyalgic(15.5%) patients.Conclusion:Unsatisfactory MD adherence is associated with a low mood, impaired QoL, work impairment, GI and vascular symptoms in Italian SSc patients. The promotion of a healthy lifestyle could positively impact on QoL and disease status of SSc patients.References:[1]Gnagnarella P, et a. NMCD 2018. DOI: 10.1016/j.numecd.2018.06.006[2]Jaeger VK et al. PLoS One, 2016.[3]Dinu M et al. Eur J Clin Nutr 2018. doi: 10.1038/ejcn.2017.58.[4]Khanna D, et al.Arthritis Rheum. 2009. doi: 10.1002/art.24730.Acknowledgments:GILSDisclosure of Interests:Giacomo De Luca Grant/research support from: SOBI, Speakers bureau: SOBI, Novartis, Pfizer, MSD, Celgene, Gerlando Natalello: None declared, Giuseppina Abignano: None declared, Corrado Campochiaro Speakers bureau: Novartis, Pfizer, Roche, GSK, SOBI, Duygu Temiz Karadağ: None declared, Maria De Santis: None declared, Elisa Gremese Speakers bureau: Abbvie, BMS, Celgene, Jannsen, Lilly, MSD, Novartis, Pfizer, Sandoz, UCB, Silvia Laura Bosello Speakers bureau: Abbvie, Pfizer, Boehringer, Lorenzo Dagna Grant/research support from: Abbvie, BMS, Celgene, Janssen, MSD, Mundipharma Pharmaceuticals, Novartis, Pfizer, Roche, SG, SOBI, Consultant of: Abbvie, Amgen, Biogen, BMS, Celltrion, Novartis, Pfizer, Roche, SG, and SOBI