Not sure if 16/8 fasting is right for you?

Sep 7, 2025, 3:10 PM•lumen

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Why 16/8 fasts aren’t the answer for everyone

Tailor your fasting window to your body’s needs

While 16/8 fasting is a popular choice, it doesn’t suit everyone. If it leaves you fatigued or hungry, finding a fasting window synced to your metabolism is the real solution.

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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