My Facebook feed has recently been full of adverts for the indiegogo crowdfunding page for a device called Lumen, which claims to measure and analyse the gasses in your breath, because the concentration of Co2 shows whether you are burning fat or carbs. Its Indiegogo rather than an actual product. Anyone have any idea whether this might be possible? Any comments? Anyone betatesting?
https://www.indiegogo.com/projects/lumen-hack-your-metabolism-lose-weight-apps-food#/
How does Lumen measure my metabolism through my breath?
When you breathe into the Lumen device, it measures and analyzes the various gases in your breath (especially Co2) through different sensors in the device.
The concentration of various gases in your breath tells Lumen what your cells are burning for energy - carbs or fats.