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Lumen is a flow meter device that uses carbon dioxide (CO2) sensors to measure the carbon dioxide levels in one’s breath—an assessment of metabolic efficiency. Although relatively new on the market, Lumen’s handheld device, combined with the accompanying app, is a unique tool for metabolism tracking and overall health management.

Lumen uses patented algorithms, CO2 sensors, flow meters and other sensing technology to determine the carbon dioxide concentration in one’s breath.

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“I’m absolutely loving it so far and highly, highly recommend it. It’s a helpful tool if you want to track your metabolism and have any health or fitness-related goals.”

— David E.

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“It’s also a great alternative to measuring ketone levels in your blood, urine, or breath. I strongly believe that the sophistication of the device, combined with its unique look, increases the changes of its effectiveness.”

— Anne T.

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“It was refreshing to get straightforward information on how my body was working and reacting to the food I was ingesting.”

Lumen is a metabolic tracking device with a simple, easy-to-use procedure — using your breath. By blowing into a CO2 sensor, the app produces detailed and individually tailored meal suggestions for weight loss and energy gain. That’s all you have to do! When you use the Lumen device and app, you’ve basically got yourself a health guru at your beck and call.

The Lumen metabolic tracking device was created by Ironman winners and twin sisters, Merav and Michal Mor, with doctorates in physiology. Tracking your metabolism was a complicated process reserved only for professional athletes or Olympians. Wanting to simplify the process, the sisters teamed up with researchers, and after four years, Lumen was born in 2020.

With a headquarters located in Tel Aviv, the Lumen founders and its CEO, Daniel Tal, work to gain notoriety and support for Lumen and its tech. The Lumen device takes an individual user’s breath and breaks down what their body needs, including the amount of carbs or fat they should be eating, and how much energy their bodies have to burn.

By offering a sleek and lightweight device, an easy-to-use app, and a simple subscription process, Lumen is a unique and exciting new product in the health and fitness market. Without any competitors of its kind, Lumen is blazing a trail and fast!

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Lumen is a health technology tool that provides real-time metabolism measurements. The small handheld device links to a smartphone app to provide insights into a user’s metabolism based on the concentration of carbon dioxide in their breath—an indicator of metabolic fuel usage.

After the user takes a breath test with the Lumen device, the app immediately displays their Lumen Level, a score that indicates whether the body is currently using fats or carbohydrates for energy. The goal is to have a balanced metabolism that can efficiently shift between using both types of fuel for energy, which is referred to as metabolic flexibility. Metabolic flexibility supports weight loss and maintenance because the body learns to burn fat as its primary fuel source. Based on data collected each morning, Lumen creates personalized daily nutrition plans for users.

The app also allows users to log meals and view the macronutrient breakdown of what they’re eating to aid in more balanced nutrition decisions. Individuals can also check their recommended macronutrient intake and track these levels throughout the day to get a better idea of how their meals impact their metabolism.

We will go over the science behind Lumen, the process of being an owner of such a high-tech device, and what’s in store for you (depending on what level of service you choose, of course). But first, let’s see what sets this brand apart from the rest:

Indirect Calorimetry: Lumen utilizes a technology known as indirect calorimetry to measure the concentration of carbon dioxide (CO2) in a person’s breath. By analyzing the CO2 levels, Lumen can estimate the ratio of carbon dioxide produced to the amount of oxygen consumed, which reflects the body’s fuel utilization (carbohydrates or fats) and metabolic efficiency.
Real-Time Data and Recommendations: Lumen provides real-time feedback based on the analysis of your breath. After breathing into the device, Lumen measures your metabolic state and provides insights into whether your body is currently using carbohydrates or fats as the primary source of fuel. It then offers personalized recommendations on nutrition, exercise, and lifestyle adjustments to help optimize your metabolism.
Meal and Exercise Plans: Lumen offers meal plans tailored to your metabolic profile. By tracking your metabolism, Lumen provides recommendations on the types of foods that may be beneficial for you, such as high-carb or high-fat meals, to support your fitness goals. It also suggests optimal times for exercise based on your metabolic state.
Lumen App: The Lumen app serves as the interface for the metabolic tracker. It allows you to sync your Lumen device, view your metabolic data, track your progress over time, and access personalized nutrition and fitness recommendations. The app provides insights into your metabolic flexibility, which is the ability to efficiently switch between using carbohydrates and fats as fuel.
Daily Challenges and Goals: Lumen encourages users to engage in daily challenges to improve their metabolic health. These challenges can include specific nutrition or exercise goals that align with your metabolic profile. By completing challenges, users can earn points and stay motivated to make positive lifestyle changes.
Integration with Other Fitness Apps: Lumen integrates with popular fitness apps like Apple Health and Google Fit, allowing you to sync your activity data and further personalize your metabolic insights. This integration helps you track your overall fitness progress and provides a more comprehensive view of your health.

Pros of Lumen

• Comprehensive compatible app: Lumen comes with a user-friendly app that provides clear and concise data about your metabolism. It offers personalized nutrition plans and actionable insights based on your metabolic data.

• Encourages accountability: By tracking your metabolism, Lumen encourages you to make smarter choices regarding your nutrition and lifestyle habits. It can serve as a motivation to maintain a healthier lifestyle.

• Great customer support: Users have reported positive experiences with Lumen’s customer support, suggesting that the company is responsive and helpful.

• Provides insights for optimization: Lumen helps you understand how your body responds to different meals and workouts, allowing you to make more informed decisions to optimize your metabolism.

• High-end hardware: The device itself is well-designed and portable, making it easy to use and carry around.

Cons of Lumen

• Requires major commitment: To get accurate results and benefit from Lumen, it requires a significant commitment of time and effort. Users must manually enter all food and exercise data daily, which may be time-consuming and tedious.

• Pricey and necessitates an ongoing subscription: Lumen is considered an expensive device and requires an ongoing subscription to access its full functionality. This may make it less accessible to some individuals.

Sure! Here's a more detailed explanation of the benefits of using Lumen:

Personalized Metabolism Tracking: Lumen uses a small breath analyzer to detect the amount of carbon dioxide in your breath. This reveals whether your body is burning carbohydrates or fats for energy. Understanding this helps you make better decisions about your diet and exercise.
Customized Nutrition Plans: Based on your daily metabolism readings, Lumen provides personalized meal plans—including the ideal mix of carbs, fats, and proteins. This removes guesswork and ensures you’re eating in a way that supports your body’s current energy needs and long-term goals.
Improved Metabolic Flexibility: Metabolic flexibility is your body’s ability to switch between burning carbs and fats efficiently. Lumen helps you improve this flexibility, which leads to better energy balance, reduced cravings, and improved weight control.
Daily Feedback & Insights: Every morning, Lumen gives you a quick reading and provides actionable insights. For example, it may tell you to eat low-carb meals that day or suggest light activity to help burn stored fat—tailoring advice to your unique metabolic state.
Supports Weight Loss: By helping you understand what fuels your body and how to manage your food intake accordingly, Lumen supports a smarter, science-based approach to weight loss. Users often see more consistent results compared to generic dieting methods.
Optimized Workout Performance: Before or after a workout, Lumen can tell you whether you’re ready to train or if you need to adjust your nutrition first. This helps ensure your body has the right fuel to power through exercise and recover effectively.
Easy to Use & Portable: Lumen is small enough to carry in a pocket or bag and syncs with an app on your phone. It takes less than a minute to use and fits easily into any routine—no lab tests or wires required.
Data-Driven Progress Tracking: The app tracks your metabolism, food intake, sleep, exercise, and other health metrics. You can view trends and progress over time, helping you stay motivated and on track with your fitness or weight-loss journey.

The Lumen device fits comfortably in the palm of the hand and is designed to be held up to the mouth for breath measurements. It’s lightweight and easy to transport as well.

The device pairs with Lumen’s app on both iOS and Android devices. To get started, simply open the app on a phone with an active Bluetooth connection and follow the prompts to take a breath measurement. During my morning check-in, the device automatically logs it as such. However, there are other logging options, such as “before eating,” “after eating” and “custom.”

After choosing a log type, the device is ready to use. The app prompts the user to turn on the Lumen device by pressing the power button. Next, they’re prompted to inhale deeply for four seconds until the purple ball on the smartphone screen (which turns green upon inhalation) reaches the center of the target zone. If a user manages to keep the ball in the center for the entire countdown, the app prompts the user to hold their breath for 10 seconds before exhaling into the device. If one fails to inhale or exhale correctly (the ball drops out of the target zone for more than 1 second), a pop-up with a countdown will display with tips on how to measure properly.

Once a measurement is complete, the app displays the user’s Lumen Level, which indicates whether they’re using fats or carbohydrates for energy. The Lumen Level ranges from one to five:

• Level one indicates burning fat for energy
• Level two indicates burning mostly fat for energy
• Level three indicates burning a combination of fat and carbohydrates for energy
• Level four indicates burning mostly carbohydrates for energy
• Level five indicates burning carbohydrates for energy

After 15 days of consecutive testing, the app displays a second critical measurement called the Flex score, which indicates the user’s metabolic flexibility, or how well their body adapts to different fuel sources.

The Flex Score can be used in conjunction with the Lumen Level to gain an even more comprehensive understanding of one’s metabolism. After the initial 15-day test period, the Flex score updates weekly so users can track progress regularly.

Lumen also tracks and updates a user’s nutrition plan daily. The app provides a detailed analysis of one’s macronutrient intake and can even provide suggestions for healthier food options. However, Lumen users must log all meals and snacks to get the most out of this feature. One’s dietary choices, daily Lumen Level and the time they stop eating at night all influence the nutrition recommendations they receive from Lumen.

Companies like Lumen help people—especially alongside a trained health care provider or health coach—leverage metabolic data to personalize daily habits for improved well-being, says Shilpa P. Saxena, M.D., a board-certified physician at Forum Health, a functional medicine clinic in Tampa, Florida. Understanding how one’s metabolism shifts throughout the day and over time can help individuals optimize their nutrition and lifestyle habits.

“The Lumen metabolic tracker was designed to provide users an at-home option for measuring their respiratory exchange ratio (RER), a measure of metabolic flexibility,” says Dr. Saxena. “Metabolic flexibility is simply the degree to which the body can flip between its ability to ‘burn’ fats or carbohydrates as fuel for energy and healing.”

According to Dr. Saxena, research suggests the tracker is accurate compared to laboratory measurements. A 2021 study in the Interactive Journal of Medical Research compared Lumen’s accuracy to the gold standard (metabolic cart) for measuring RER in a laboratory setting. The metabolic cart is a clinical test measuring oxygen use and carbon dioxide production for estimating an individual’s metabolism at cellular levels. The study found the device accurately captured RERs aligned with the metabolic cart[1].

Dr. Saxena also says the app can help users understand how stressors, poor sleep or physical inactivity affect their scores. However, she warns that this information “is just information” unless one takes steps to make changes based on the data.

“Coupling your Lumen experience with a lifestyle medicine coach can help you make sense of all the information and recommendations so you can maximize success with the device regardless of what your goals may be,” she concludes.

Lumen is a handheld metabolic tracker, meaning its target audience is anyone looking to keep a close eye on their metabolism: athletes, those looking to lose weight, or anyone looking to gain muscle. The device is for anyone who wants detailed guidance on what they should be consuming, when, and how much or little activity they should do in a day.

The device itself is easy to use — all you need is the app and your breath. The simplicity behind the science of Lumen is what makes this technology appealing to virtually anyone who finds motivation in personalized fitness information or those who need a little help, guidance, and encouragement for their day-to-day diet and activity.

Keep in mind that there are a handful of individuals that Lumen is not recommended for, including those with diabetes, asthma, kidney disease, cancer, obese people, COPD, thyroid disorders, or those who are pregnant. It’s probably just best to consult your doctor if you have any specific questions, or want to know if Lumen is right for you.

Science is progressively making complicated weight loss methods more accessible. The technology behind Lumen is groundbreaking, and it was only in the recent past that consumers have ached for something so innovative right at their fingertips. With Lumen’s widely obtainable device and technology, the future is here.

One look at the inventive and advanced science behind owning a Lumen device had us convinced. That you can have such insight into the details of your body, with a handheld tracker, is fantastic and convenient. The perk? You can control and retrieve your Lumen information through an app. The whole Lumen concept is low cost, low fuss, effective, and worth a try.

How to Use the Lumen?

• Download the Lumen App: Install the official Lumen app on your smartphone (iOS or Android). Sign up and go through the setup instructions.
• Charge and Connect the Device: Fully charge your Lumen using the USB cable. Turn it on and connect it via Bluetooth to the app.
• Take a Morning Breath Measurement: Use Lumen first thing in the morning, before eating or drinking. Inhale deeply through the device, hold your breath for 10 seconds, then exhale slowly. The app will show whether you're burning fats, carbs, or a mix.
• Follow Daily Recommendations: Based on your breath reading, the app gives personalized nutrition, meal, and exercise tips. Follow the suggested carb intake and activity level for the day.
• Repeat Before/After Meals & Workouts (Optional): You can also take measurements before workouts, after meals, or before bed to better understand how your body reacts to food and exercise.

Lumen® 30-Days Money Back Guarantee

The Lumen is backed by a 100% money back guarantee for 30 full days from your original purchase.

If you’re not totally and completely satisfied with the Lumen, or your experience in the first 30 days from your purchase and we’ll give you a refund within 48 hours of the product being returned.

That’s right, simply return the Lumen, anytime within 30 days of your purchase and you’ll receive a refund, no questions asked!

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Who owns Lumen?

Lumen is owned by the larger share-holding company, MetaFlow. The company was co-founded by twin sisters, Merav and Michal Mor, and the current CEO, Daniel Tal.

Does Lumen ship internationally?

Yes, Lumen does ship internationally, but they won’t cover the cost of duties, and the price for shipping varies by country. Unfortunately, they don’t give an estimated shipping time for addresses outside of the US and Canada.

What is Lumen’s Privacy Policy?

The company’s privacy policy focuses on the use of the app required to access your Lumen information and covers the sharing and storing of your personal information. They also do not take subscribers that are minors and are not responsible for anyone under 18 years old.

What is Lumen’s Shipping Policy?

Lumen will ship your device within 7-10 days from your order date. However, this timeline is only regarding any orders shipped within the US, and includes free ground shipping.

What is Lumen’s Refund Policy?

Lumen gives you a 30-day window from your delivery date to return your device. All of the original packaging and device hardware need to be returned along with the product, or you won’t get your money back.

Lumen® | Official Site

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— Anne T.

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Features Used in Lumen

We will go over the science behind Lumen, the process of being an owner of such a high-tech device, and what’s in store for you (depending on what level of service you choose, of course). But first, let’s see what sets this brand apart from the rest:

Pros & Cons of Lumen

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