Lumen reads CO2 on a single breath and tells you whether you are burning more fat or carbs. Useful as a morning check-in; easy to over-obey as a diet priest.
Gadgets
Limited evidence
Lumen
Handheld breath analyzer that estimates fat-versus-carb burn.
How to use
Morning breath test, then optional post-meal checks. Follow the app’s carb guidance skeptically.
Details
- Manufacturer
- Metaflow Ltd
- Connectivity
- Bluetooth
- Battery life
- Up to 14 days typical
- Compatibility
- iOS, Android
- Primary use
- At-home metabolic fuel estimates
Editorial rating ★ 3.7
Educational for a month. Less useful once your meals are already boring and stable.
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