![]() If the CO2 in your breath is low, you’re burning fat for fuel. If you have a lot of CO2 in your breath, this means you’re burning carbs for fuel. ![]() This information has previously only been available to people with access to a metabolic cart or chamber, which I can assure you, is pretty much nobody. Using a CO2 sensor, the device will calculate your RER – respiratory exchange ratio – and tell you whether you’re using fat or carbs for fuel. To use Lumen, you breathe into the device. So, I’m assuming that they have the knowledge and understanding to develop a device like this.īut is it useful, and for who? How does Lumen work? Lumen was invented by two Israeli sisters who are physiology PhDs as well as triathletes. But what am I going to do with that information? Lumen can theoretically tell me things about my metabolism, but what can I use that information for? Like, it’s interesting to know that airplane turbofan blades are made out of titanium. It’s important to note that in life, some information is interesting, but not all information is useful. ![]() It sounds like a really cool, almost futuristic concept: blow into a handheld machine, which will measure your metabolism and then tell you what to eat.īut just like with gut microbiome testing and DNA diets, are we overreaching with the science here? Full disclosure: I haven’t tried Lumen myself, but have gone over the science and sales pitch behind the device in depth in order to let you know if it’s a concept worth exploring. Ads for the very sleek Lumen device are all over my social feeds, and so many of you have asked me to review it.
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