Breathalyser can tell if you are burning fat from a single exhalation

Nature, Published online: 23 July 2026; doi:10. 1038/d41586-026-02295-w The compact device can measure when the body is in ketosis and could help people to manage weight loss.

Scientific signal separates durable discovery from noise — and often foreshadows policy and product.

Nature reported on this under science. RedScroll surfaces the signal with an extractive brief — not a reprint of the original article. Read the source for full reporting.