HOW YOUR BREATH REVEALS YOUR METABOLISM

WHAT IT MEASURES

You actually breathe out a different amount of carbon dioxide when you’re burning mostly carbs than you do when you’re burning mostly fat. All carbs means you’re exhaling as much CO2 as oxygen you’re taking in.

Lab machines can estimate fuel usage by measuring oxygen and CO2, but Lumen measures CO2 alone. BEHIND THE NUMBERS

Changing what you eat will shift what you exhale, which can alter the score you see. On this test, you’re aiming for the middle – a mix of both carbs and fat. By knowing how your body rolls and adjusting for that, you can train your metabolism to be more flexible over time and avoid issues such as obesity and diabetes.