Lumen is the world’s first portable device to measure track and analyze your metabolism. See if your body is using fats or carbs for fuel in a single breath.

Lumen analyzes the %CO₂ in your breath and determines if you are using mostly fat or carbs for fuel based on the CO₂ concentration. Lumen has been validated to match the gold standard …

Nutrition personalized to your physiology Lumen provides the insights you need daily to understand how your diet impacts your body, and guidance to keep you on track.

“Lumen” is a unit of luminous flux - the total amount of visible light emitted by a source of light - just as the lumen device sheds light on how our nutrition and lifestyle affect our metabolism …

Lumen uses CO2 sensors, flow meters, barometric pressure, and temperature sensing technology to determine whether you’re burning carbs or fats for energy and sends this data to the app.

With Lumen you have the same tech at your fingertips and can measure your metabolism from the comfort of home, in minutes not hours and for the first time with a personalized daily plan …

Yes, for Lumen devices purchased starting July 30th, 2023, after the cancellation comes into effect you’ll still be able to take unlimited metabolic measurements and get your Lumen level.

Get help with your Lumen metabolism tracker. Explore how-to guides, FAQs, and troubleshooting tips - or contact our support team for personalized assistance.

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Lumen provides you with a daily measurement of your source of energy: fats or carbs on a scale of 1 to 5, based on your RER. Lumen then uses these measurements to provide you with a …