Intermittent Fasting Phases Explained Visually
Your Body's Metabolic Timeline
Understanding the phases turns "starving" into "healing."
Phase 1: Blood Sugar Drop (0-12 Hours)
Your body finishes processing your last meal. Energy shifts to stored glycogen.
Phase 2: Fat Burning / Ketosis (12-18 Hours)
The "Magic Zone." Your body begins using fat as a primary fuel source. Atara’s glowing circle turns deep green here.
Phase 3: Autophagy (18-24+ Hours)
Cellular cleanup. Old cells are recycled. This is peak metabolic efficiency.
Frequently Asked Questions
When does fat burning start?
Usually around hour 12 for most people.
What is autophagy?
A cellular 'recycling' process that peaks after 18-24 hours.
Start your fasting journey today
Install the Atara PWA in seconds. No App Store required. 100% private.
Open App