Track & monitor your metabolism in a single breath

Know what to eat and when to reach your weight loss and fitness goals

Lumen is for people who want to

Simple as breathing

Your breath reveals if your body is burning fats or carbs– anywhere, anytime

Hundreds of beta users love Lumen

Over the past year, we’ve helped hundreds of beta users make a sustainable change in their lives

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What I get with Lumen

Take the guesswork out of your nutrition

Lumen is like having a nutritionist in your pocket

Give your body a voice

Lumen helps you answer questions about your body no one else can, to uncover the why's behind it all

The science behind Lumen

What is metabolism?

Metabolism is life. It occurs in each and every cell of your body. It's the process by which your body converts the food you eat into energy for immediate or later use.

How does Lumen measure my metabolism through my breath?

The Lumen device uses a CO2 sensor and flow meter to determine the carbon dioxide concentration in your breath, which indicates the type of fuel your body is using to produce energy– fat or carbs.

CO2 concentration is measured using a unique breath maneuver (patent pending), which is performed by inhaling a fixed volume of air through the Lumen device (dynamic to each individual), holding it for 10 seconds, and exhaling fully.

A look at Lumen's technology

Over the past four years, we validated Lumen’s ability to measure metabolic fuel usage at top hospitals, universities, and clinics worldwide. Our qualified team of scientists, health experts and nutritionists are committed to bringing a device to market that’s accurate and dependable.

The idea of measuring metabolism through the breath isn’t new– it’s actually been helping world-class athletes reach peak levels of fitness for years. This form of metabolic measurement is known as RQ, or respiratory quotient, and is the ratio of carbon dioxide (CO2) to Oxygen (O2) consumed. But traditionally, measuring RQ required a person to be placed in a metabolic cart or chamber for up to 60 minutes, and a trained practitioner to work on analyzing the results.

Dr. Merav Mor, Lumen Co Founder and Chief Metabolic Research Officer conducting validation studies.

Lumen's patent-pending technology reduces the time it takes to measure metabolic fuel usage from 60-minutes down to a single breath.

Between 2015-2017 multiple external and internal validation studies were conducted on the Lumen device and found Lumen's method of metabolic fuel measurement to be highly correlative with the gold standard measurement for RQ (respiratory quotient). 

What people are saying

"I haven't looked at carbs the same way since using Lumen. I've shaped-up and lost weight because of it."

Carly M.
Marketing Manager

"I love that Lumen gives me daily information about how food impacts me. There's no guessing."

Andy S.
Operations Manager

"Lumen has given me a new way of thinking about my diet and helped me make smarter decisions about my nutrition. I get instant feedback and a straightforward meal plan."

Kim N.
Lawyer

"With Lumen, every day I can see what's working and not working. I can see how my body is responding– it's a good feeling."

Maggie R.
Stylist

No more feeling stuck, confused and lost about what to eat

Designed with you in mind

From its compact size to its protective matte coating and magnetic cap, Lumen is designed with an attention to detail to make it easy to use– anywhere and at any time. It’s taken us four years of prototyping and testing to develop this breakthrough technology.

"In a market saturated with me-too wearables, we wanted to help the Lumen team create something truly unique. They have achieved that by combining their unique sensing technology with robust behavioral science, bringing proven coaching techniques into the digital domain.”

Thomas Sutton
VP Design, Frog

Meet the team

Frequently asked questions