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See it in action
Your metabolism reveals how long you should fast. With Lumen, you can measure exactly when your body reaches peak fat burn, which occurs when you shift from burning fat to carbs.
For example, you could measure your metabolism after 12 hours of fasting. If you’re in fat burn, gradually extend your fast and recheck every 1–2 hours.
Continued fat burn means your glycogen is depleting effectively. But once you switch back to carb burn, that’s your sign to stop fasting and refuel to avoid muscle breakdown.
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