Obesity, as a major risk factor of metabolic syndrome (MetS), represents a pandemic, especially in Western societies, and is considered a risk factor for malignancies. (), is a definite carcinogen with global distribution. We aimed to investigate, for the first time in Switzerland, the main gastric mucosa premalignant histological lesions of bariatric patients in correlation with MetS components and Infection (-I). By reviewing retrospectively 94304 patient cases, a total of 116 eligible patients having undergone bariatric surgery were identified. The mean patient age was 48.66 years. (+) patients were 24% (28/116). Presence of gastric mucosa atrophy was documented in 8/28 (+) patients (29%) and (2/88) (-) ones (2%) ( = 0.006). Gastric mucosa intestinal metaplasia was observed in 14/28 (50%) (+) patients versus 3/88 (3.4%) of (-) group ( < 0.0001). (+) patients exhibited statistically higher arterial hypertension ( = 0.033). The homeostatic model of assessment insulin resistance was also statistically significantly higher for the (+) group ( < 0.001). In a multivariate analysis, including arterial hypertension, gastric mucosa atrophy, and intestinal metaplasia as variables, statistical significance remained only for intestinal metaplasia ( = 0.001). In conclusion, -I is associated with premalignant gastric mucosa histologic lesions and MetS components, including arterial hypertension and IR. Further large-scale prospective studies are required to confirm these findings.