Lumen Metabolism Tracker

A successful weight-loss plan starts with understanding and optimizing your metabolism. The Lumen device can help by providing an innovative way to track your metabolism.

What does the Lumen device measure?

Lumen measures the carbon dioxide (CO₂) concentration in your exhaled breath. Based on that level, it determines whether your body is burning carbohydrates or fats for energy. Higher CO₂ indicates carbohydrate burning, lower CO₂ indicates fat burning.

Why is this important?

Metabolic flexibility — the ability to switch efficiently between burning carbs and fats — plays a key role in weight control and maintaining energy levels. Knowing which fuel your body is using helps you understand how your diet and lifestyle affect you, enabling better food choices and supporting successful weight loss and improved health.

How can measuring with Lumen help?

Lumen gives daily feedback on your metabolic state, allowing you to make personalized dietary and lifestyle decisions. For example:

• Meal planning: If Lumen shows your body is mainly burning carbs, you may need to reduce carbohydrate intake so your body can switch to burning fat. If your meals always contain carbs, you may not burn fat even when eating very few calories.
• As an athlete: Pre-workout measurements can help determine whether you need carbohydrate fueling to maximize performance or whether you want to promote fat burning.
• Lifestyle changes: Lumen lets you track how sleep, stress and other lifestyle factors affect your metabolism, so you can shape healthier habits.

Overall, Lumen offers deeper insight into how your body works and helps you steer your weight-loss efforts more consciously, increasing the chance of success.

Energy sources

Your body primarily uses carbohydrates and fats as fuel, and which it prefers depends on several factors:

1. Nutrition:

Carbohydrate intake: Eating high-carbohydrate foods raises blood sugar and triggers insulin release. Insulin promotes glucose uptake into cells, so the body primarily burns carbohydrates for energy.

Low carbohydrate intake: When carbs are "depleted," your body can tap into fat stores and start producing energy from fats, resulting in fat loss. High carbohydrate intake has the opposite effect — it promotes fat storage.

2. Physical activity:

Low-intensity exercise: Activities like walking or light movement primarily use fats for energy.

High-intensity exercise: Running or weight training requires quickly available energy, so the body relies more on carbohydrates.

3. Metabolic state:

Fasted state: Extended fasting or low-carb intake leads the body to break down fats for energy.

Post-meal state: After eating, especially carbohydrate-rich meals, the body uses the ingested carbs as the main energy source.

4. Hormonal regulation:

Insulin: Insulin helps glucose enter cells and promotes carbohydrate use as fuel.

Glucagon: Glucagon raises blood sugar and stimulates fat breakdown, especially when blood sugar is low.

These factors together determine when and in what proportion your body burns carbs or fats for energy.

Why choose the Lumen device?

• Personalized nutrition advice: Lumen analyzes your breath and offers daily dietary recommendations that consider your metabolism, activity and health goals.
• Scientific accuracy: Lumen brings lab-level metabolic measurement to the comfort of your home. It monitors exhaled CO₂ concentration and derives metabolic data with clinical-grade precision.
• Easy to use: Do a daily baseline test each morning. This ~30–40 second test shows whether your body is burning fat or carbs and gives guidance to optimize your metabolism.
• Unlimited repeats: You can perform additional measurements any time during the day — before and after meals or workouts — to see how your body adapts.

How does Lumen work?

• Just one breath: The test is simple: take a deep breath through the device, hold it for 10 seconds, then exhale through the device. The whole process takes about 30–40 seconds, and the device immediately reports your current metabolic state.
• Analysis: Lumen measures the volume of air and the CO₂ level in your exhaled breath. With clinical precision, it determines which fuel source you are using — high CO₂ indicates carbohydrate metabolism, lower values indicate fat utilization.
• Recommendations: Based on the results, the Lumen app provides personalized dietary and lifestyle recommendations to help you reach your goals.

Recommended uses

Personalized nutrition and meal planning

One of Lumen’s most valuable applications is personalized nutrition. By understanding when your body burns fat or carbs, you can set the right diet to optimize energy, weight and overall health.

For example, if Lumen shows you burn mostly carbs in the morning, you might reduce evening carbohydrate intake and increase protein and fat. Conversely, if the device shows fat burning, you can choose balanced meals with complex carbs.

Besides personalized meal plans, Lumen provides recommendations tailored to your goals, whether weight loss, muscle gain or energy maintenance. This feedback supports better nutrition choices and improves metabolic efficiency.

Training optimization

Athletes and fitness enthusiasts can benefit from measuring metabolism before, during and after workouts to optimize training plans.

By understanding your fuel usage, you can time intense cardio, strength training or fat-burning sessions more effectively. For example, when your body burns carbs, high-intensity training may be more effective; when in a fat-burning state, longer low-intensity workouts are ideal.

Lumen also guides post-workout nutrition: understanding your metabolic state after exercise helps decide whether you need carbs to refill glycogen or protein and fats for recovery and muscle growth.

Weight loss and weight control

Weight loss remains a primary motivation for many users of metabolic tracking. Lumen helps you understand how your body shifts between burning carbs and fats throughout the day.

Since burning fat is essential for weight loss, you can adjust meal timing, macronutrient intake and activity to stay in a fat-burning state longer.

Daily feedback encourages regular tracking and conscious eating, which are key to sustainable weight management. Seeing how specific foods or habits affect your metabolism makes it more likely you’ll adopt long-term healthy behaviors instead of short-term dieting.

Prevention and management of chronic conditions

More people use metabolic tracking to prevent or manage chronic conditions like diabetes and metabolic syndrome.

Lumen provides real-time insight into how foods and lifestyle affect your metabolism, making it a useful tool for those concerned with blood sugar regulation.

By avoiding blood sugar spikes and understanding your body’s responses to different foods, you may reduce the risk of metabolic diseases.

For those already receiving treatment for chronic conditions, Lumen can supply valuable data to monitor status and implement necessary lifestyle changes. For example, people with insulin resistance may learn how certain foods affect their metabolism and choose lower-glycemic options to stabilize blood sugar.

The psychological impact of Lumen is also notable

As you better understand how your body works, you develop greater responsibility for your health. Daily feedback reinforces positive habits and gives a stronger sense of achievement when you see measurable progress. This feedback encourages more mindful and healthier behavior that supports long-term well-being.

How to use it

The Lumen device requires a mobile app. The manufacturer provides the app for free for Android and iOS phones. The app is available in English only.

The device operation and measurement procedure are quick to learn, so fluent language skills are not strictly necessary. However, the phone app contains hundreds of videos, recipes and a wealth of dietary advice. It gives daily personalized recommendations for diet and activity and logs your food intake, calculating its composition. With intermediate English skills you can make the most of Lumen’s extensive support.

The device supports monthly and yearly subscriptions. These subscriptions are relatively expensive but worthwhile for those who speak English well, as they provide strong additional support.

If you do not speak English well, we do not recommend purchasing a separate subscription. Buying the device itself grants lifetime free measurements and access to the app’s basic functions.

User reviews

• “With Lumen I finally understood how my metabolism works, and thanks to that I achieved my weight-loss goals.” – Anna K.
• “As an athlete, Lumen has become an indispensable tool to optimize my training and nutrition.” – Péter M.

Purchase information

Our store does not sell the product directly, but we believe the device can greatly help establish healthy eating habits and optimize body weight. Therefore our webshop cooperates with the manufacturer Lumen.me and supports its promotion.

For more information click here to go to the Lumen.me shop. We recommend using this link when purchasing, as buying via medimarket.hu will give you a discounted price. If you visit the site from elsewhere, the discounted price does not apply.