10/17/2026
Can you train your body to burn both fat and carbohydrates for energy?
Coach Maria shares how she uses Lumen, a device that analyzes your breath to estimate whether your body is primarily using fat or carbs for fuel.
But here's something interesting.
Maria explains how Lumen includes a “boost day” in her routine after several consecutive days of fat-burning readings. The idea is to increase carbohydrate intake and help the body continue practicing the switch between different fuel sources.
This is what metabolic flexibility is all about: your body's ability to adapt between using fat and carbohydrates for energy.
The goal isn't just to burn fat. It's to understand how your body uses fuel.
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