Trusted by 300,000+ users
See lasting weight loss with Lumen

No more guesswork. One breath reveals exactly what your body needs, so you can lose weight and actually keep it off.

Start your journey

How Lumen helps

Know exactly how long to fast for your unique body using Lumen, the only metabolic tracker that can personalize your diet.

Benefits of using Lumen for weight loss

Experience fewer
cravings and better
appetite control
Get past calorie counting with data-backed insights
Build and maintain your muscle even while losing weight
Burn more fat,

even at rest
Use carbs for energy

instead of storing them as fat
Eat enough to lose
weight and avoid
a slow metabolism
Finally understand your body and reach your weight loss goals.
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Don’t waste another breath
Start your journey now

Real people. Real results.

See how Lumen works for some of our 300K+ users who cracked the code to sustainable weight loss.

How Lumen measures your metabolism
The most advanced technology and sensors
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.
The Lumen app
The app then reveals what your body is burning for energy, and provides insights and strategies to help you reach your weight loss goals.
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40+ integrations
Sync Lumen with your favorite health apps and wearables for a seamless, data-driven experience.

How your metabolism works

Your daily lifestyle choices impact your metabolic health, 
and you can see it all in your breath. 

Digestion
When you consume food, it first enters the stomach, where digestive enzymes begin to break it down. The partially digested food then moves into the intestine, where it’s further broken down into nutrients, including glucose and fatty acids.
Metabolism
Mitochondria, the powerhouses of your cells, burn glucose and fat from the food you eat, or your body’s carb and fat stores, into energy you use daily. When your mitochondria and your metabolism are healthy, your body can make energy efficiently.
Breath
By measuring your breath, you can determine whether your mitochondria are burning glucose or fat for energy. This helps you understand your metabolism and the impact of your lifestyle choices on your fat burning and weight loss.

Innovative research,
groundbreaking applications

Lumen’s accuracy is clinically validated, giving you the confidence 
to let go of fad diets for good and trust your body’s own signals.

FAQ

Weight loss isn’t just about calories or workouts, it hinges largely on your body’s metabolic flexibility, or how well your mitochondria switch between burning carbs and fats. Many people overlook how central this process is.

When you’re metabolically flexible, you can lose more weight, optimize fat burn, use carbs for energy efficiently, and balance your energy levels to avoid cravings.

According to long-term studies, over half of the weight lost is regained within two years, and over 80% by five years. Focusing on metabolic flexibility, not restrictive diets, is key to long-term success.

It all depends on your real-time results. Lumen adjusts your plan according to your metabolic measurements each morning. From carb cycling and personalized fasting schedules to tailored macro recommendations and nutrition plans, Lumen adapts to you.