Trusted by 300,000+ users
Discover a health program designed just for you

Your metabolism shifts throughout your monthly cycle, fertility journey, PCOS, and menopause. With just one breath, Lumen reveals what your body needs, helping you make smart, data-driven decisions to feel your best — at every stage of life.

Start your journey

How Lumen works

1

Take a breath

In 20 seconds, Lumen reveals what your 
body is burning for energy: carbs or fats.
2

Get your personalized plan.

Based on your real-time results, the app provides a tailored meal plan, carb recommendations, and daily macros.
3

Track your meals with
AI-powered food logging.

Log your meals in a snap using Lumen's
AI-powered food tracker to stay on top
of your macros and carb recommendations.
4

See your evolution

The more you use the app, the more insights and strategies you’ll unlock to feel your best no matter
where you are in your health journey.

Real people. Real results.

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

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.
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 navigate hormonal changes with ease.
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40+ integrations
Sync Lumen with your favorite health apps and wearables for a seamless, data-driven experience.

Benefits of using Lumen for women’s wellness:

Understand how your hormones
and metabolism work together and how to
fuel your body with personalized nutrition
Break through incessant cravings
with balanced energy
Push past weight loss plateaus,
burn more fat
Find out exactly how long to fast in sync with your body
and hormonal changes
Balance your circadian rhythm
and improve your sleep
Build and maintain muscle
through menopause and beyond
Finally understand your body and reach your wellness goals.
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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

Lumen uses your breath measurements to identify metabolic shifts across the menstrual cycle (follicular, ovulatory, luteal), adapting and personalizing nutrition and exercise recommendations for your unique body.

Lumen adjusts your carb intake instantly based on your real-time metabolic measurements. Just take a breath to get your customized macro plan daily.

Yes. Lumen does this by training your body to efficiently switch between burning carbs and fats for energy. This improves your metabolic flexibility, which has many benefits, including balanced energy levels and reduced cravings.

Pregnant women should not use Lumen as it can affect measurements.

Yes. Lumen provides lifestyle strategies to improve your insulin sensitivity. This might include timing your carbs around workouts, adding veggies to every plate, moving more, swapping to complex carbs, or including healthy fats from sources like fish and walnuts.

Lumen personalizes your nutrition and training based on your real-time metabolic measurements. It does this through tailored nutrition plans, AI health coaching, pre- and post-workout fitness strategies, and custom lifestyle insights.

Measure your metabolism throughout your fast for personalized recommendations. Begin by measuring your metabolism when you first wake up to establish a baseline and determine whether you’re burning carbs or fats for fuel.
Continue measuring your metabolism every hour. The goal is to remain at level 1 or 2, which indicates fat burn. During a fast, your mitochondria should be burning fat for fuel. When you shift towards carb burn (level 4 or 5), this indicates you should break your fast, as your glycogen stores are getting critically low and leading your body to break down muscle for energy.

Take a Lumen pre-workout breath measurement to determine if you should fuel up before your high-intensity workout. If you’re burning fat, that’s a sign your glycogen stores are low, and you should eat a fast-digesting carbohydrate source like a banana to avoid muscle breakdown.
Lumen’s fasting measurement is also helpful for maintaining muscle. You can find your ideal fasting window by measuring your metabolism throughout your fast. The moment your body shifts from fat burn to carb burn indicates you’ve passed your fasting sweet spot. That’s a sign to end your fast and eat something nutritious to avoid muscle breakdown.
Lumen also provides tailored macro recommendations based on your real-time metabolic measurements, so you get enough protein and carbs to build and maintain your muscles.