Pocket breathalyser detects fat-burning ketosis from a single breath

Researchers have developed a compact breathalyser-style device that detects whether the body is in ketosis from a single exhalation, as published in Nature on 23 July 2026. The gadget measures acetone — a by-product of fat burning — and could help people on low-carb or weight-loss programmes track their progress non-invasively.

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