Are you stuck plateauing in your weight loss journey or feeling low on energy despite eating and exercising? The Lumen Metabolism Tracker is a handheld device that analyzes your metabolism—right from your breath—and delivers real-time insights and daily guidance tailored to your body and goals.
What Is Lumen and How Does It Work?
Lumen is a compact breath-based metabolism device developed by MetaFlow Ltd., measuring carbon dioxide (CO₂) in your breath to indicate whether you’re burning mostly fats or carbohydrates. That’s how it estimates your metabolic flexibility—your body’s ability to switch fuel sources efficiently.
When you breathe into Lumen, the device reads your breath CO₂ levels and, via its app, assigns a score (typically 1–5) showing where you fall on the fat-to-carb usage spectrum.
- KNOW IF YOU’RE BURNING FAT OR CARBS—IN SECONDS: Track your metabolism in real-time with a single breath using the Lumen …
- BUILT AROUND YOU, DESIGNED FOR RESULTS: Lumen is for anyone stuck in a weight loss rut, feeling drained, or just wanting…
- CLINICALLY VALIDATED & EXPERT BACKED: Lumen is grounded in science and validated in peer-reviewed studies. Used in healt…
Personalized daily insights
Lumen’s app integrates breath data with lifestyle inputs—exercise plans, sleep, stress—and crafts daily nutrition plans to guide macro intake (carbs, fats, proteins) aligned with your metabolic state.
Tracks long-term flexibility
After roughly two weeks of measurements, you receive a flex score reflecting your metabolic flexibility, updated weekly so you can track progress.
Validated tech
Studies support that Lumen’s measurements correlate with laboratory respiratory exchange ratio (RER) readings, with significant CO₂ detection post-meal interventions.
Guidance beyond data
Beyond raw numbers, users get meal suggestions, fasting tracking tools, workout nutrition prep (before and after), and even menstrual cycle–aware recommendations. App connects to Apple Health, Google Fit, Garmin, and more.
Expert and User Feedback
Tom’s Guide praised the sleek design and accountability Lumen brought but cautioned it demands commitment and manual input—and that results take time.
A six‑month test run (Marie Claire) highlighted the device eventually integrated into daily routines, helping shape healthier choices, though early use was difficult.
Road Bike Rider found Lumen useful for those practicing intermittent fasting or tailoring workout fueling, especially to track fat burn without finger-prick methods.
Today’s Dietitian Magazine noted while Lumen promotes metabolic flexibility, the supporting studies were company-funded and small-scale, and didn’t directly validate weight-loss claims.
A Reddit user summed it up well:
“It’s a cute device … fun to see where it says your body is at. To get the full benefits you would need to fully track all your food intake.”
Pricing & What’s Included
- The standard Lumen device package includes the device, USB‑C charging dock and cable, a travel case, and a 12-month subscription unlocking premium features and community support. Battery life is around 10 days per charge.
- Pricing varies by source; a bundle with subscription is often around $199–$299, with multi‑month plans adding more value.
Is Lumen Right For You?
Great if you:
- Want actionable insights personalized day by day
- Are committed to using the device regularly and syncing lifestyle data
- Seek improved metabolic efficiency rather than quick-fix weight loss
Maybe not if you:
- Expect immediate results
- Prefer minimal tracking or already understand your body’s cues
- Have certain medical conditions (e.g., diabetes, asthma, COPD, pregnancy)—these users are advised to consult a healthcare provider.
Where to Buy
If you’re ready to buy the Lumen Metabolism Tracker, here are some available options:
Summary
The Lumen Metabolism Tracker offers a novel, science-backed way to measure and optimize your metabolism via breath analysis. It pairs hardware with an integrated app for personalized nutrition, energy insights, and flexibility tracking. That said, it demands routine use and lifestyle data input to work effectively—and while early studies are promising, more independent, large-scale research is needed to fully validate its long-term health claims. If you’re ready to lean into data-driven habit change, Lumen might just be worth the investment.