The presence of ketones in urine, indicating that the body is breaking down fat for energy instead of glucose. It can occur in diabetes, starvation, or very low-carbohydrate diets.
From 'ketone' (derived from German 'keton,' a chemical compound) and Greek 'ouron' meaning 'urine.' The term developed as understanding of ketone metabolism advanced in the 19th and 20th centuries.
Ketonuria gives urine a distinctive fruity or nail polish remover smell because ketones are volatile compounds that evaporate easily! It's like your body's emergency backup fuel system kicking in—when glucose isn't available or can't be used, your liver starts breaking down fat into ketones for brain fuel.
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