My Lumen device helped me improve my metabolic flexibility, and here’s how:
I always thought my metabolism was just something I had to accept. Some people burn fat easily, some don’t, right? Turns out, that’s not the full story. I learned that metabolic flexibility—the ability to switch between burning carbs and fat efficiently—is actually something you can train, and Lumen was the game-changer that helped me do it. And if you’re thinking about trying it, you can use our Lumen discount code GYMFLUENCER10 for 10% off your order.
What is Metabolic Flexibility?
Before using Lumen, I had no idea what metabolic flexibility even was. So in case you’re in the same boat, let me explain. Metabolic flexibility basically means that your body can easily switch between using carbs or fat for energy. The better your metabolic flexibility, the more efficiently your body can fuel you throughout the day—no energy crashes, fewer cravings, and way better workout performance.
For me, the problem was that I felt constantly stuck in carb-burning mode. I’d eat, feel great for a little while, then crash and need another snack just to keep going. My body wasn’t tapping into fat stores for fuel like it should. That’s where Lumen came in.
How Lumen Helped Me Improve My Metabolic Flexibility
Lumen is basically like having a tiny metabolic coach in your pocket. You breathe into it, and it tells you if you’re burning carbs or fat based on the CO2 levels in your breath. Simple, but super effective. Here’s how it helped me completely change my metabolism.

1. I Learned How to Eat Smarter
One of the biggest things Lumen taught me was how to structure my meals based on what my metabolism actually needed. If I woke up in carb-burning mode, I knew I had extra stored energy and could focus on protein and healthy fats to encourage fat-burning. If I woke up in fat-burning mode, I could keep that going by staying mindful of my carb intake.
Before Lumen, I was just eating whatever I thought was “healthy,” but now I actually eat in a way that supports metabolic flexibility—and I have way more energy because of it.
2. My Workouts Became So Much More Effective
I used to think that fasted workouts were the key to burning fat, but that’s not always true. Lumen showed me that my body wasn’t actually in fat-burning mode most mornings, so working out on an empty stomach wasn’t really helping.
Now, I check my metabolic state before a workout and adjust accordingly. If I’m in carb-burning mode, I take that as a sign to push harder with high-intensity training. If I’m in fat-burning mode, I know a steady-state cardio session will be the best way to maximize results. It’s completely changed how I train, and I’m actually seeing better results now.
3. No More Energy Crashes or Random Cravings
This was a huge one for me. Before using Lumen, I’d get hit with random energy crashes in the middle of the day, no matter how much coffee I drank. Now, I understand that those crashes were because my metabolism wasn’t efficiently switching between fuel sources.
Since improving my metabolic flexibility, I don’t have those crazy highs and lows anymore. My energy stays way more stable throughout the day, and I’m not constantly reaching for snacks just to function. Plus, I finally feel like I’m fuelling my body the right way instead of just reacting to my hunger.
The Best Part? It’s So Easy to Use
The best thing about Lumen is that it takes, like, 30 seconds to use. One quick breath test in the morning, and I know exactly what my body is doing. Over time, I started seeing patterns, and now I feel completely in control of my metabolism.
If you’re tired of feeling like your metabolism is working against you, Lumen is 100% worth it. And if you’re ready to try it, don’t forget to use our discount code GYMFLUENCER10 for 10% off your order.