Claudia Reytor-GonzálezDaniel Simancas-RacinesNáthaly Mercedes Román-GaleanoMartín Campuzano-DonosoAngelo Michele CarellaRaynier Zambrano-VillacresTeresa MarinelliLuigi CoppolaMarco MarchettiMartina GalassoLudovica VerdeGerardo SarnoGiuseppe Annunziata2025-11-262025-11-262025-06-23https://doi.org/10.1080/09540105.2025.2521270https://cris.ute.edu.ec/handle/123456789/1845The global prevalence of obesity has risen to epidemic proportions, posing significant health challenges across populations and contributing to increased morbidity and mortality from non-communicable diseases. Among its many consequences, obesity is now firmly established as a modifiable risk factor for breast cancer, particularly in postmenopausal women. The association between obesity and breast cancer is driven by complex and interrelated biological mechanisms, including chronic low-grade inflammation, hormonal imbalances, adipokine dysregulation, insulin resistance, and metabolic dysfunction. These factors collectively create a pro-tumorigenic environment that supports cancer initiation, progression, and recurrence. This review explores the multifaceted nexus between obesity and breast cancer, emphasizing the critical role of inflammatory, hormonal, and metabolic pathways in mediating disease risk and outcomes. Additionally, it highlights the emerging contribution of gut microbiome dysbiosis in modulating host immunity and systemic inflammation in the context of obesity. Nutritional strategies—ranging from dietary pattern modification to caloric restriction and time-restricted feeding (TRF)—are examined for their potential to reduce risk, enhance treatment efficacy, and improve survivorship in breast cancer patients.Breast cancerchronic inflammationhealthcarenutritionobesityjournal-article