Sardines Fasting

Autophagy without muscle loss

Only for iPhone

Free · In‑App Purchases

iPhone

Reach autophagy on sardines without losing muscle. 35+ peer-reviewed studies, 5 protocols from 24h to 21 days, 36 languages. SardinesFasting guides you through structured sardine fasts — 24 hours to 21 days where you eat only sardines, water, coffee or tea. Protein and omega-3 preserve lean mass while insulin stays low enough to trigger autophagy. WHY SARDINES, NOT WATER A water-only fast eventually burns muscle. Sardines are 22-25 g of protein and 1.5 g of EPA/DHA omega-3 per can, low in mercury, calcium-rich (bone-in). You get the metabolic switch, ketosis and autophagy of a water fast — without the lean-mass cost. FIVE BUILT-IN PROTOCOLS • 24h Sardine Reset — beginner, one-day metabolic switch • 3-Day Insulin Reset — intermediate, crushes insulin, surges ketones • 5-Day Repair — advanced, deeper autophagy and stem-cell signaling • 21-Day Advanced N=1 — extended self-experiment (medical supervision required) • 17h Hybrid IF — sustainable daily protocol LIVE TRACKING • Hour-by-hour fasting timer that shows your active phase: digestion → glycogen depletion → metabolic switch → ketosis → autophagy → deep repair → stem-cell window • Manual or CGM/CKM logging of glucose and ketones (SiBio, NutriSense, HealthKit) • Automatic Glucose-Ketone Ratio (GK Ratio) and GKI calculator • Visceral-fat and waist tracking • Streak, autophagy-days-this-month, sleep, mood BUILT ON PEER-REVIEWED SCIENCE 35+ scientific references across autophagy (Takeshige 1992, Mizushima 2007), intermittent fasting (de Cabo & Mattson NEJM 2019, Longo 2014), ketosis (Newman & Verdin 2017, Veech 2004), omega-3 nutrition (Mozaffarian JAMA 2006), insulin resistance reversal (Hallberg 2018), and prolonged-fasting stem-cell biology (Cheng 2014). Every claim links to a paper you can verify. CYCLE-AWARE FOR WOMEN Long fasts in the luteal phase backfire. The onboarding asks about your cycle and concentrates deeper protocols in the follicular phase. COMMUNITY Share your progress, join structured group challenges (3-Day Insulin Reset, Sardine September, cycle-aware fasting), see a weekly leaderboard ranked by autophagy hours. Posts are moderated. SAFETY FIRST Risk-assessment questionnaire flags contraindications (pregnancy, eating-disorder history, diabetes medication, low BMI). Explicit watch-outs for refeeding syndrome on extended fasts. LOCAL-FIRST PRIVACY Logs stay on your phone. No account required. Optional HealthKit sync. The AI coach (Pro) processes your data in-memory and discards it. 36 LANGUAGES Full UI translation across 36 languages — metabolic health shouldn't be paywalled behind English. PRO €4.99/month or €49/year, billed automatically. Pro adds: AI coach with cycle-aware adjustments, automatic CGM/CKM sync, hour-by-hour autophagy phase tracking, doctor-ready PDF reports. Cancel anytime in Settings → Apple ID → Subscriptions. Not medical advice. Talk to your doctor before any extended fast. Terms of Use (EULA): https://sardinesfasting.com/legal/terms/

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What's new in this version: • A brand-new app icon and refreshed visual identity • More reliable Apple Health connection • Clearer subscription pricing on the upgrade screen • Performance and stability improvements Thank you for fasting with us. Questions or feedback are always welcome from the in-app settings.

Version 1.1

The developer, Stephane Sprauer, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    LyteFast
    Size
    5.2 MB
    Category
    Health & Fitness
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    Languages
    English and 32 more
    • English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
    Age Rating
    16+
    • 16+
    • Learn More
    • Frequent
      Medical Treatment information

      Contains
      Health or Wellness Topics
    In-App Purchases
    Yes
    • SardinesFasting Pro — Monthly $4.99
    • SardinesFasting Pro — Annual $49.99
    • Learn More
    Copyright
    © 2026 LyteFast
  • Developer Website
  • Privacy Policy
  • License Agreement

    • More by Stephane Sprauer

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