Lipotoxicity is a concept within cell biology and pathology that describes the detrimental effects arising from the accumulation of excess lipids in non-adipose tissues. It investigates the molecular and cellular mechanisms by which lipid overload disrupts cellular homeostasis, leading to dysfunction, organelle stress, inflammation, and ultimately contributing to tissue damage and the pathogenesis of various metabolic diseases, including insulin resistance, type 2 diabetes, and non-alcoholic fatty liver disease.