How to know if you're burning fat or carbs

Lumen is the first portable device that measures your metabolism. Lumen provides you with a nutrition plan and other insights and tips to improve your metabolism and reach your health goals.

Thomas DeLauer is a health expert that brings nutrition and fitness tips and information to the busiest people around the world.

[BWT]

I bought the Lumen because of Thomas. But I'm heavy into my Keto process right now so the Lumen is a bit confusing for Keto peeps.

[tonymorse]

I would suggest, that people read the reviews on this device, before parting with any money.

[chelseamikail]

What should I do when the Lumen says I am burning carbs? What do I do with that information?

[singing]

the beginning of the video he makes a link between CO2 and fats, but actually the link should be between CO2 and Carbs.. the more CO2 in exhalation means more Carbs burning rather than fat. so the beginning of the video confuses the whole concept for no reason whatsoever just to get more confused around a very clear simple principle of how this device operates.

[TKim]

Did you guys basically screen record his video?

[lettingyouknow]

I wonder what the Lumen reading will be after consuming L-Carnitine which apparently promotes fat usage instead of carbs.

[Justkeepswimming-re]

I don't get it. If burning carbs how do you burn fat? What if I just walk daily with no hard core stuff?