The smart fasting companion with real-time fat burn tracking, Garmin Connect sync, and super personalized health insights based on your unique body data.
Fully autonomous tracking powered by your wearable. Syncs with all major health platforms. Science-backed, deeply personal.
Beautiful 24-hour cycle with 14 scientific milestones. Watch your body shift from glycogen to fat burning to deep autophagy in real-time.
Live speedometer showing grams of fat oxidized per hour. Based on the Mifflin-St Jeor equation, validated by metabolic chamber studies.
Garmin, Google Fit, Apple Health, Fitbit, Strava, Samsung Health, Whoop — weight, sleep, heart rate, steps, calories. Fully automatic.
"You fast longer after good sleep." "Carb spike yesterday = harder fast today." "Your weight drops faster on keto weeks." Intelligence unique to you.
Auto-sync macros from your nutrition app. Keto zone alerts under 50g carbs. Protein, fat, fiber — all tracked and charted for you.
Weight trends, sleep architecture, resting heart rate, stress, body composition, fasting records — 11 interactive charts, one beautiful view.
No complicated setup. No credit card. Just create an account and start.
Sign up with your email. Confirm your inbox. Done.
Target weight, fasting style (OMAD, 16:8, extended), macro goals. 30 seconds.
Hit start. Watch your fat burn in real-time. Get insights. Reach your goals.
All calculations and metabolic models in this app are based on peer-reviewed clinical studies.
My Fasting Journal is an informational and tracking tool only. It does not provide medical advice, diagnosis, or treatment. All metabolic calculations are estimates based on population-level studies and may not reflect your individual physiology.
Always consult a healthcare professional before starting any fasting regimen, especially if you have diabetes, eating disorders, are pregnant/nursing, or take medication. Extended fasts (over 24 hours) should only be done under medical supervision.
Fat oxidation estimates use the Mifflin-St Jeor equation for BMR and substrate oxidation ratios from metabolic chamber studies. These are approximations — actual results vary based on genetics, fitness level, diet history, and hormonal status.
Scientific Sources:
Patel et al. (2023) — 60h fasting metabolic chamber study, Clinical Nutrition Wang et al. (2024) — 21-day fasting physiological changes, Scientific Reports Effects of Fasting on Metabolic Hormones (2024), PMC Narrative Review Critical Assessment of Fasting for Metabolic Health (2025), Endocrine Reviews Mifflin et al. (1990) — Predictive equation for resting energy expenditureNo ads. No premium tier. No data selling. We believe health tools should be accessible to everyone.
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