The BOMASH study is a single-center, prospective/retrospective observational study without pharmacological interventions. It will include all patients diagnosed with Metabolic-Associated Steatotic Liver Disease (MASLD/MASH), whether newly diagnosed or previously identified at the center during follow-up or as part of routine diagnostic and therapeutic care. The aim of the study is to identify predictive factors related to the prognosis of patients with metabolic liver disease (MASLD/MASH). Specifically, the study seeks to uncover biomarkers that can identify individuals at risk of requiring a liver transplant or developing HCC.