The Zero app has become the gold standard for intermittent fasting tracking, particularly among keto dieters who combine fasting with low-carb eating for enhanced results.
Download Zero and select your fasting protocol — 16:8 is recommended for beginners. Set your fasting start time to match when you typically finish dinner. The app will calculate your window automatically.
Real-time fasting timer with colour phases (blue for metabolic shift, orange for ketosis, yellow for peak fat burning at 12+ hours). Weekly streak tracking. Integration with Apple Health for sleep and activity data.
Hours 0–4: Digestion and absorption. Hours 4–8: Glycogen depletion begins. Hours 8–12: Transition to fat burning. Hours 12+: Peak fat burning and ketosis. Hours 16+: Autophagy increases. Zero’s visual phases help you understand what your body is doing.
When you break your fast on keto, the transition back to fat-burning mode is almost immediate (versus hours for carb-eaters). This means your eating window on keto-IF is more metabolically productive. Break your fast with our keto breakfast options and close your window with satisfying keto dinner recipes.
Zero is simple, beautiful, and remarkably motivating. Download it today and start building your fasting habit.