Fatty acids appearing in urine, an abnormal sign of disordered fat metabolism. Healthy kidneys excrete virtually no fat, so lipaciduria points to conditions such as severe diabetes, nephrotic syndrome, or disorders of lipid metabolism where fatty acids spill into the urine. Laboratory detection involves chemical analysis of urine samples, and the finding prompts investigation of the underlying metabolic or renal disease. In nutrition research, unusual urinary fat excretion may also be studied in the context of extreme diets or malabsorption. Treatment addresses the root cause rather than the urinary finding itself, aiming to restore normal lipid handling.