The invention relates to Bifidobacterium CECT 7765 and to the use thereof in the prevention and/or treatment of excess weight, obesity and related pathologies. The invention likewise relates to the Bifidobacterium CECT7765 strain, to the cellular components, metabolites and secreted molecules thereof, to the combinations thereof with other microorganisms, and to compositions that include the preceding products, as well as to the use of one strain of the species Bifidobacterium pseudocatenulatumo and to the use of the CECT 7765 strain for preventing and/or treating obesity； excess weight； hyperglycemia； and diabetes, preferably type-2 Diabetes Mellitus； hepatic steatosis or fatty liver； dyslipidemia； metabolic syndrome； immune system dysfunction associated with obesity and excess weight； and an imbalance in the composition of the intestinal microbiota associated with obesity and excess weight.
