3-Day Fast - 72h Water Fast

The only fasting app built specifically for 72-hour water fasts. Most fasting apps are designed for 16:8 intermittent fasting with extended fasting bolted on as an afterthought. 3-Day Fast is different — it's purpose-built for the 72-hour water fast, the protocol backed by research on autophagy, immune reset, and metabolic renewal. REAL-TIME PHASE TRACKING Follow your body through 8 distinct fasting phases — from post-meal to deep autophagy. Know exactly what's happening inside your body at every hour, backed by published research. SUPPLEMENT GUIDANCE Not sure what's safe to take during a fast? We tell you. Magnesium, electrolytes, creatine — what's fine and what breaks your fast. No more guessing. SMART PREPARATION Get a step-by-step prep checklist so you're set up for success before you start. Know what to eat, what to buy, and what to expect. SAFE REFEEDING PROTOCOL Breaking a 72-hour fast incorrectly can cause refeeding syndrome. Our guided protocol walks you through exactly what to eat in the first 24 hours after your fast. MILESTONE CELEBRATIONS Hit 24h, 48h, and 72h markers with visual milestones. Track your fasting journey over time and see how far you've come. WORKS OFFLINE The timer keeps running even without internet. Your data stays on your device. WHO THIS APP IS FOR • People doing their first extended water fast • Experienced fasters who want proper phase tracking • Biohackers interested in autophagy optimization • Anyone following the Valter Longo or Peter Attia fasting protocols SAFETY FIRST Extended fasting affects blood sugar, blood pressure, and electrolyte balance. Always consult a healthcare provider before fasting, especially if you have medical conditions, take medications, or have a history of eating disorders. Built by Mindful Apps Studio.