In this Review of Lumen, We Will Discuss how you can Gain a Unique Insight into Your Body and How to Fuel It Properly

Lumen Overall Score: 8.3/10

Design Score: 8.5/10

Ease of Usability Score: 8.0/10

Features and Functions Score: 8.5/10

Value for Money Score: 8.0/10


  • Compact and with an air of high quality about it
  • Unique in terms of what it accomplishes
  • Get immediate and visible effects from your diet and nutrition efforts.
  • The app contains a variety of information.
  • The lifespan of the battery: two weeks


  • It demands a significant amount of dedication.
  • A commitment on a monthly basis

There is nothing novel about smart scales. When you step on one of them, your weight measurements will immediately be transmitted to a companion app on a smartphone or a web dashboard, where one may view them. After that, you will be able to monitor your development over time. But we are already in 2022, and that is not even close to being enough time. In this review, I take a look at Lumen. This one-of-a-kind breath analyzer fits in your pocket. It promises to revolutionize the way you manage your weight by tracking your metabolism and delivering a personalized eating strategy. It analyzes the concentration of carbon dioxide (CO2) in your exhaled breath to accomplish all of this.

When the device was first made available back in 2018, it was crowdfunded on the website Indiegogo. Around 10,000 individuals contributed to the campaign, which ultimately raised an astonishing $2.4 million. Lumen is now accessible to everyone after experiencing a few production delays due to unforeseen issues.

You might believe that your metabolism stays the same throughout the day, but in reality, nothing could be farther from reality. It all relies on the foods you eat, when you eat them, how much physical activity you get, how much sleep you get, and a variety of other things.

Carbohydrates and fats are the primary types of fuel that are utilized by the human body. If you want to achieve your health, weight, and exercise goals, you must have a solid understanding of the ratio with which you would use these things at any given time.

When you wake up, you want to be in the mode of burning fat, and then over the day, you want to shift more into the mode of burning carbs. In point of fact, the adaptability of your metabolism is a positive trait to have. This is because it is advantageous to have the capability of swiftly switching between several sources of fuel. An adaptable metabolism, for instance, is more effective at burning fat, making it a little bit easier to get rid of those unwanted pounds. However, Lumen takes it much further. Additionally, it instructs you on what foods to consume and when. This is a one-of-a-kind piece of technology that cannot be compared to anything else on the market.

On paper, all of this looks and sounds fantastic, but does this approach work in practice? Continue reading to learn more about my thoughts on Lumen.

Look at the Construction and Components of the Lumen Breath Analyzer

  • It has a luxurious feel to it and resembles a vaping gadget in appearance.
  • Compact and lightweight, making it simple to transport from place to place.
  • A CO2 sensor and a flow meter can be found within.
  • It just has to be charged every two weeks on average.

Appearance and Feeling

The overall appearance and quality of Lumen are very upscale. This sophisticated appearance is helped along by the protective matte finish and the magnetic cap that can be removed. It is pretty comparable to a vaporizer in appearance and function. Some people aren’t going to appreciate it at all.

It is highly portable, making it simple to take in your pocket, backpack, or rucksack wherever you go. The design is streamlined and compact, and it can be easily stored in the small black pouch that is included free of charge with the purchase. Additionally contained within the packaging is a removable cable that connects to a USB port as well as a circular magnetic charging dock.

Next to the travel bag, the charging cradle, and the charging wire is the Lumen gadget.

There are a variety of meanings associated with each color. The color green means that the device is fully charged, while the color purple indicates that Lumen is linked to the smartphone you are using. When activated, a round LED emits light from within itself and may be found in the center of the Lumen.

The controls for the power supply are located underneath the LED. There is only one actual button, and it is designed to blend in very well with the body. A lot of care and attention was placed into the details because everything has a highly polished and costly aspect to it.

The part of the device intended to be placed against the user’s lips while inhaling air is the cap. There is a nick there that functions as a mouthpiece, and it’s not very big. One can find the air exhaust at the opposite end.

Because this is such an intimate piece of technology, I wouldn’t recommend lending it to anyone else. There will be a buildup in saliva when the product is being used. Therefore, you need to clean it regularly. Having said that, from a technical standpoint, you might provide permission to other family members to utilize it. They can configure the application on their own personal smartphone using their own profile and then link it to the same device.

The casing is composed of a single piece of sculpted plastic with a velvety feel. Because they are constructed of stainless steel, the mouthpiece and the lid have a little increased weight.

In case you were wondering, the item weighs 95 grams and has accurate dimensions of 102 millimeters by 41.5 millimeters by 33.3 millimeters. The docking station has dimensions of 14.6 millimeters by 76.4 millimeters by 68.3 millimeters and weighs 80 grams. It appears to be made of the same material as the body itself.

The Engine Compartment

The interior of Lumen is where all of the magic takes place. The business has developed patented technology capable of performing the same functions customarily carried out by a metabolic cart or chamber. It is the kind of technology that is typically found in laboratories. However, as this can take up to an hour and costs a significant amount of money, it is only accessible to a limited number of people.

A mouthpiece is provided via the top split.

Along with a flow meter, Lumen was able to include a miniature CO2 sensor within the device, thanks to the company’s innovation. When you inhale, then hold your breath, and finally, exhale, these can be used to calculate the concentration of carbon dioxide (CO2) in your body. The algorithms sort through the data to determine what metabolic fuel your body uses at any given moment to generate energy (also known as “metabolic fuel utilization”). And all of this is accomplished with only ten seconds of work.

As was said previously, the fuel source can be carbohydrates, fat, or anything between the two. A high concentration of carbon monoxide (CO2) in your breath is indicative of the first, whereas low CO2 levels indicate the second. There will be instances in which it will be a mix of the two. The education in scientific principles came to an end there. When carbohydrates are burned for fuel, more carbon dioxide is produced than when fats are burned. The metabolic tracker produces an accurate reading after each time it is used.

It has a beautiful and uncomplicated sound. And perceptive! If you have access to this kind of information, you can “hack” your metabolism by changing your eating habits, nutrition, and routines.

Lumen is not something you will have to charge very frequently, if at all, particularly in terms of battery life. You should be able to get roughly two weeks’ worth of use out of a single charge if you use it usually. This squares with the observations I’ve made. During the approximately two and a half weeks during which I used it (several times per day), I only had to go and plug it in to charge it once.

Having a health device that doesn’t need to be charged as frequently as others is a welcome break from the norm. This indicates that if you are going on a trip or are just going to be transporting Lumen about with you, you can, in most situations, leave the charger at home.

Lumen is refueled by being placed on the docking station while it is in this position. When properly aligned with the magnetic charging pins, the device will be kept firmly in place without the need for additional support. You should then plug the USB-C cable into a power outlet and focus your attention on the LED indicator ring.

The Lumen breath Analyzer: a User’s Guide and Review

  • An app that’s easy to use and has a straightforward setup process
  • It is possible to measure in less than a minute.
  • The device should ideally complete readings multiple times every single day.
  • Stick to the nutrition requirements for the most outstanding possible results.

Implementation and employment

Using Lumen is a pleasure. However, you would need to configure it before you can do that. Be sure to fully charge it before using it for the first time, just like you would with any other gadget that uses rechargeable batteries. You can put that time to good use by downloading the app for your iOS or Android-based smartphone. On the gadget itself, Lumen does not show any information regarding readings. You will have to use the application on your phone to do that.

The procedure is straightforward to understand. During the program setup process, it will offer you a few inquiries about yourself, such as your age, sex, weight, and possibly other information. To finish this process and pair Lumen with your smartphone doesn’t take a lot of time at all. After the initial Bluetooth pairing, Lumen always successfully connects to the application on my phone, in my experience. During my testing, I did not experience either a single connection drop or a single sync problem.

You can also connect the Lumen smartphone app to your Apple Health or Garmin Connect account. This is helpful because your activity and sleep data will sync automatically.

It has the feel of premium quality about it. The breathalyzer is designed to be utilized multiple times daily. For instance, you may use it first thing in the morning, 30 minutes before exercising, 30 minutes after exercising, before eating, and an hour or two after eating, after fasting, and before going to sleep. You could also use it after exercising and before going to sleep. You can also assign your own personalized check-in.

This seems like a lot, and it is a lot. You do not need to utilize it in every instance in a strict manner. In most cases, I would take a measurement first thing in the morning and then sometimes once or twice more at other points throughout the day. The specifics of my using case scenario would change daily. I would use it sometimes, either before or after I ate or after I worked out. Or before sleep.

It is essential to keep in mind that the device requires approximately one day to be calibrated. This is the stage in which it acquires a detailed understanding of your physiology and metabolism. There is still some work to be done on all of the algorithms, which will take another couple of days. After that, everything should go well.

Instructions for Taking a CO2 Reading Using Lumen

The one positive aspect is that getting a reading done just takes a concise amount of time. Launch the application on your smartphone, and select the “take a measurement” icon when prompted. The device will then walk you through the rest of the steps. You should be able to finish all of this in fewer than a minute in most circumstances.

You may be required to provide a little bit of additional information in certain usage case circumstances. For instance, if you are going to measure your workout, you will be asked to indicate the kind of workout you will undertake, how long it will last, and how intense it will be. After that, you will be instructed to “Sit down, loosen up, and switch on your Lumen.”

After that, all that is required of you is to take several deep breaths through the Lumen until you are instructed to stop. The mobile application for your smartphone has a circle indication that will turn green when it detects that you have taken an adequate number of breaths. When the ring becomes green after ten seconds, you should begin to exhale through your mouth softly. There is an indicator in the form of a bar that tells you whether or not the level of force you are blowing at is sufficient. You will want to let out the vast majority of the breath currently trapped in your lungs. If you don’t take in enough air before the reading, you won’t be able to exhale enough of it afterward, which will prevent you from getting an accurate reading.

Occasionally you will be required to take two measures, sometimes only one. I couldn’t tell what the requirement was for that.

There are various circumstances when you are informed you have not appropriately breathed. It requires some experience, and the Lumen metabolic tracker app will coach you through everything. After a few use sessions, I discovered that maybe one out of 5 or 6 measures was troublesome - and I was requested to do it again. It isn’t a big deal. It does get better and easier with repetition. But I’d never call it as challenging.

That’s basically about it as far as taking readings. You will then be shown in the Lumen application what source of fuel you are currently consuming. It falls somewhere around the middle on a scale of 1 to 5. When you move further down the scale, it indicates that you are burning more fat. Carbohydrate consumption increases proportionately with altitude.

Evaluation Before a Workout Session

Let’s imagine you are thinking about going for a run or a ride on your bike. In preparation for the majority of endurance workouts, you should load up on carbohydrates. If you want to know if you need to carb up further or if your body already has all the energy it needs for the activity, you can find out with a fast test using Lumen 30 minutes before you start exercising. This also relies on the kind of workout that you do. Certain types of workouts may not require as many carbohydrates as others. Additionally, fat can be utilized to a certain extent.

To wake up in a state in which your body is already burning, fat would be the ideal scenario. And then, as the day goes on, you should switch to eating carbohydrates to maintain your activity level. In particular, if you are going to be working out that day.

Running a marathon is a straightforward illustration demonstrating carbohydrates’ significance. In long-distance competition, carbohydrates are typically the primary source of fuel for energy. For this reason, it is advised that you load up on carbohydrates in the 48 hours leading up to the marathon event. Pasta is the most popular choice for most individuals. Rice, potatoes, and pizza are favorites of some people. Carbohydrate loading is a common term used to describe this practice.

Your physical being requires this in terms of being able to run the entire 26.2 miles of the race’s course. Therefore, it is not as simple as working out consistently for a few months to be able to maintain the effort. To satisfy the enormous demands placed on your energy reserves by the event, you will need to adhere to a particular diet. In that case, you run the risk of “hitting the wall,” which refers to the experience of being so exhausted that you cannot continue moving forward.

Imagine doing this for any kind of physical activity. Your daily carbohydrate and fat intake should be adjusted according to the intensity and length of your workouts. If you change this, you’ll be able to boost your performance significantly.

The App Provides Access to a Variety of Data

On the “Today” section of the Lumen smartphone app, you will see a timeline that displays your daily measurements. In addition to that, there is a weekly pie chart that provides a summary of your readings for the previous week.

The “Me” part of the program contains a timeline that covers a more extended period of time. You will be prompted to enter your weight every few days at random intervals manually. This is charted as well below the readings in the paragraph. It is imperative that this be kept up to date since it will have an effect on the results that the application generates.

Last but not least, after roughly two weeks of consistent use of the Lumen Flex, you will be given what is known as a Lumen Flex score. On a scale that ranges from 0 to 21, I was given a score of 7.5. Your body’s ability to expend fat and carbohydrates and how closely your internal clock is in sync with your typical daily activities are both taken into account when the app determines your Flex score. The objective is to put your metabolism into a state where it can function with high adaptability. You might be at one level right now, but if you adjust your food and nutrition, you can get to the next level.

The one thing that needs to be done is to make sure that Lumen is used consistently. There are reminder alerts available in order to assist with remembering things. If you turn them on, the app will send you reminders to encourage you to continue using Lumen. You will know how to develop your routines and get the most out of this method, so follow it carefully.

Dietary Plan

The measurement of CO2 in your exhaled breath is just one component of the whole package, requiring little effort to grasp and keep up. The other component is related to dietary intake.

The Lumen cannot only tell you what your body is using as fuel and how efficiently it is doing so, but it also provides other information. Additionally, it instructs you on what foods to consume and when. Therefore, to get the most out of the device, you should ideally adhere to the daily diet plan the app generates for you.

The nutrition recommendations will tell you the exact number of grams of carbohydrates, fat, and protein that you ought to consume in order to accomplish your objective. These are calculated based on your vital statistics, as well as readings from the Lumen CO2 device taken first thing in the morning, your exercise levels, and the number of carbohydrates you consumed the day before. This kind of information calls for complete dedication, especially if you are trying to reduce the amount of weight you are carrying.

But are you sure you completely understand the proportions of carbohydrates, fat, and protein that make up your typical diet? Most folks don’t. To put in some effort is required at this point.

The daily nutrient regimen was never something I strictly adhered to; instead, I used it more as a broad guideline of what I should eat overall. If I had been serious about dropping some pounds, I would have made a more significant effort to adhere to the instructions. But I didn’t need any more information than that.

To make the task more manageable, The restaurant Lumen provides a comprehensive guide that covers breakfast, lunch, snacks, and dinner. You can understand the average amounts of carbohydrates, protein, and fat contained in a serving by tapping on any of the suggestions. These suggestions are based on the guidelines that come with your daily nutrition plan. There is also an area for you to register your daily carb intake (which you should do) and monitor your daily activity and sleep statistics.

In this Evaluation of the Lumen Breath Analyzer, We Make Sense of the Data

  • It requires dedication to make the most of the device’s capabilities.
  • Numerous studies conducted by experts attest to the reliability of measurements
  • Reviews from customers also count.

When it comes to using Lumen, there is, without a doubt, a steep learning curve involved. In order for a regular user to be able to comprehend all of the information, it will therefore require some time. It is, without a doubt, a teaching and learning experience. The mobile app on your smartphone is loaded with instructions, how-to guides, video walkthroughs, and other information that will assist you along the journey.

Until recently, the only means to determine one’s metabolic rate was by administering an expensive and time-consuming test in a clinical environment. This is referred to as RER, and some consider it the gold standard. This measure is utilized as a primary data point for Lumen. It makes it possible to perform measurements of this kind in the comfort of your own home at a fraction of the usual expense and in a fraction of the usual amount of time.

The CO2 component is straightforward to grasp. Everything hinges on the foods you eat, your activity, and the particulars of your metabolism. At any given moment, you will be aware of the fuel source that your body is currently utilizing. The numbers fluctuate quite a bit, so it is possible that on any one day, you could be in a state where you are burning only carbohydrates or purely fat.

As was indicated, the insights, actions, and nutrition guidance are the areas that present the most significant challenge. I don’t believe that it is easy to adhere to the meal plan’s parameters, especially the minute ones. The degree to which you will benefit from any of this information is directly proportional to the level of dedication you are willing to demonstrate. And what it is that you wish to accomplish. If you want to reduce your body fat, I advise you to make it a priority to follow the suggestions as closely as possible.

It is not difficult to transport with you wherever you go. I can see various usage possibilities for Lumen. Even though I don’t have a problem with my weight, I’ve discovered that using the device both before and after working out has been immensely helpful. When I go for a run, it helps my fitness performance to have a more scientific element, which is something I wouldn’t have if I didn’t know whether or not I was getting enough fuel beforehand.

We can’t expect immediate results from our efforts. However, I think people trying to shed extra pounds will benefit from the device the most. At the very least, you would be looking at the possibility of using it for several months.

When evaluating a product, I rarely rely on other people’s opinions, especially reviews. In this particular scenario, it was prudent to review the feedback provided by other clients—especially those who have been working with Lumen for a more extended period of time. I was curious about other people’s lives, so I looked into them.

Thankfully, there are other channels via which one can obtain consumers’ experiences. Trustpilot is one of these websites. There are now over 350 reviews available, and an average of 4.5 stars out of a possible 5 is given to Lumen.

People who have utilized Lumen and been successful in losing weight throughout a number of months have provided several of these evaluations. Their eating habits have changed, and it has gotten them thinking about how to lose weight in a healthy way. The motives for using will be highly diverse between individuals. Some people are using Lumen as a tool to help them keep to a specific sort of diet, while others are using the gadget as an aid for helping them deal with medical difficulties since they have those issues. This exemplifies the ingenuity of the apparatus.

The Reliability of Lumen has been Verified through Scientific Research

The obvious next thing to ask is whether any of this can be supported by scientific evidence. How accurate is Lumen when it comes to determining the amount of CO2 in your breath? There is really no way for me to attest to the accuracy of its readings because I do not have access to such information.

The scientific research papers that demonstrate its veracity are what create confidence in people. On its website, the company refers to a few of these points. At least one of them is a writer.

Following the findings of the previous research, one can conclude that Lumen’s technology is valid as a device that accurately monitors changes in metabolic fuel utilization and does so in a manner comparable to the gold standard. According to the findings of the investigations, Lumen can determine whether there have been shifts in metabolic fuel usage as a consequence of physical activity, dietary modification, or the ingestion of a meal heavy in carbohydrates.

In addition to this, there is research that the San Francisco State University carried out. This leads to the following conclusion.

This study demonstrates that Lumen can accurately estimate metabolic fuel use in a manner comparable to the “gold-standard” metabolic cart. As a result, Lumen can provide users with simple access to real-time metabolic information regardless of location.

Here is a link to a different work that other researchers have evaluated. This one was published in JMIR Publications, and it contributes another voice to the chorus of voices vouching for the reliability of the readings.

There is no basis upon which to cast doubt on the veracity of the findings of scientific studies. In particular, if they are obtained from a variety of distinct sources. However, from a personal standpoint, I believe that the evidence is in the pudding. Therefore, I put more stock in the testimonials provided by clients who have utilized the product for a more extended period of time. And they are of the highest quality.

The Crux of this Review of the Lumen Breath Analyzer: Is it Really Worth the Money?

Lumen is able to determine what your primary source of energy is with just one breath. It does this by determining how much energy is being burned from carbohydrates as well as how much energy is being burned from fat by measuring the CO2 generation in your breath. This allows you to monitor the processes occurring within your body in real-time.

Lumen needs to be calibrated for a whole day so that it may learn all of the ins and outs of your metabolic process. It will be a few more days before the algorithms are in their final, optimized state. After that, however, you should be good to go.

Utilizing the device first thing in the morning will allow you to acquire guidance on how the meals and activities from the previous day are influencing your metabolism. The software will then provide a particular daily goal for the number of carbohydrates you should consume and suggestions for meal combinations. You can keep checking in with yourself by taking a few more breaths here and there throughout the day.

It is possible to use the device, for instance, to determine whether you have sufficient energy for a strenuous workout or whether you need to fuel up first. Or so that you may observe the results of your workout later. In addition, there are a few studies that provide evidence that supports its usefulness.

I am having a great time with Lumen and would highly recommend it to anyone who is interested in incorporating a scientific component into their workouts. Those who want to utilize it as a tool to assist in their weight loss efforts can do so as well.

It is an exhilarating experience to hold something as cool as this in your palm. Think of it as a tool for boosting your motivation. If you have access to this kind of information, you will be capable of learning how your body works with food and improving your digestion as a result of these discoveries. The catch is that using the device regularly is necessary in order to obtain the maximum advantage from it. It’s possible that this won’t appeal to everyone.

Leave a Reply