I always wondered whether fasting before exercise was actually a good idea or just another fitness myth. I’d heard people rave about the benefits, but I wasn’t sure if it would work for me or just leave me feeling weak and cranky. Then I started using Lumen, and let me tell you, it completely changed the way I look at fuelling my workouts. If you’ve ever questioned whether fasting before exercise is right for you, Lumen takes all the guesswork out of it. And if you’re thinking of trying it, don’t forget you can grab 10% off with our discount code GYMFLUENCER10.
How Fasting Before Exercise Affects Your Body
When you work out on an empty stomach, your body has to rely on stored energy instead of the food you’ve just eaten. In theory, that means you’ll burn more fat. But the tricky part is that not everyone’s metabolism reacts the same way. Some people thrive on fasted workouts, while others feel sluggish and drained.
This is where Lumen came in for me. I wanted to see how my metabolism actually responded to fasting before exercise, rather than just following random advice. After tracking my metabolism for a few weeks, I started seeing clear patterns in how my body switched between burning carbs and fat.
What Lumen Showed Me About Fasting Before Exercise
Lumen gave me daily feedback on whether I was burning fat or carbs, and that helped me understand exactly when fasting before exercise worked best for me. Here’s what I learned:
- If I woke up in fat-burning mode, I knew I could handle a fasted workout without feeling like I was running on fumes. Those were the days when my body was already primed to burn fat, so I leaned into it.
- On days when I was in carb-burning mode, fasted workouts felt like a struggle. That was my sign to have a small pre-workout snack instead of forcing myself through a miserable session.
- Strength training and high-intensity workouts were harder in a fasted state, but low-intensity steady-state cardio was totally fine. This was a game-changer because it meant I could time my fasted workouts based on what my metabolism actually needed.

How I Adjusted My Routine
Once I had the data, I stopped guessing and started making real changes. Instead of randomly deciding to fast before workouts, I let my Lumen readings guide me. If I was in fat-burning mode, I’d go for a fasted workout. If I was burning carbs, I’d have a little fuel beforehand.
I also started experimenting with how long I fasted before exercise. Sometimes 12 hours was enough, while other days, stretching it to 14 or 16 hours felt even better. Lumen helped me fine-tune my fasting window so I could get the best results without feeling depleted.
The Biggest Takeaways From Using Lumen
The biggest thing Lumen taught me is that fasting before exercise isn’t a one-size-fits-all approach. It can be amazing for fat-burning, but only if your body is ready for it. Some days, fasting gave me insane energy and focus. Other days, I needed a bit of food first to perform at my best.
The best part? I no longer feel like I’m just guessing. I have real data to back up my choices, and I can adjust in real time based on what my metabolism is actually doing.
If you’re curious about how fasting before exercise works for you, Lumen is honestly the best way to find out. And if you’re thinking about giving it a go, don’t forget to use the discount code GYMFLUENCER10 for 10% off. Trust me, once you see how much easier it is to understand your metabolism, you’ll never go back to guessing again.



