FASTING PROTOCOLS

15:9 Intermittent Fasting: The Ideal Protocol for Working Professionals

📅 September 21, 2026 ⏱️ 1 min read
🩺 Medically Reviewed & Fact-Checked by FastingTracker Medical Board • Written by Aly Owen • Updated: September 21, 2026
15:9 Intermittent Fasting: The Ideal Protocol for Working Professionals

✨ Key Takeaways

  • Learn the best practices of intermittent fasting for optimal health.
  • Understand how to track your fasting windows effectively.
  • Discover the science-backed metabolic benefits of fasting.

15:9

Fast: 15h | Eat: 9h

Eating window: 9:00 AM–6:00 PM

15:9 IF (eating 9 AM–6 PM) fits perfectly into office routines and aligns with circadian rhythm research for maximum metabolic benefit.

🔬 Expert Note: Circadian research shows eating within 9–10 hours aligned to daylight produces the strongest metabolic benefits per fasting hour — 15:9 is perfectly aligned.
Aly Owen - Nutritionist
🩺 Medically Reviewed & Fact-Checked

Aly Owen ✓ Verified

Certified Nutritionist & Intermittent Fasting Expert

Aly Owen is a certified nutritionist specializing in metabolic health, intermittent fasting protocols, and sustainable weight loss with over 8 years of clinical experience. All guidance is verified against peer-reviewed literature.

Certified Nutritionist (CN) • Metabolic Health Specialist • View Full Bio & Credentials →

📚 Scientific Studies & Medical References (5 Sources) ▼

FastingTracker adheres to strict editorial standards, citing peer-reviewed clinical trials and authoritative medical institutions.

  1. New England Journal of Medicine (2019): de Cabo R, Mattson MP. Effects of Intermittent Fasting on Health, Aging, and Disease. N Engl J Med. 381(26):2541-2551. PubMed 31881139 • DOI
  2. Cell Metabolism (2014): Levine ME, Suarez JA, Brandhorst S, et al. Low Protein Intake and Periodic Fasting Promote Longevity and Autophagy. Cell Metab. 19(3):407-417. PubMed 24606898 • DOI
  3. Obesity (Silver Spring, 2018): Anton SD, Moehl K, Donahoo WT, et al. Flipping the Metabolic Switch: Understanding and Applying Health Benefits of Fasting. Obesity. 26(2):254-268. PubMed 29086496 • DOI
  4. Annual Review of Nutrition (2017): Patterson RE, Sears DD. Metabolic Effects of Intermittent Fasting. Annu Rev Nutr. 37:371-393. PubMed 28715993 • DOI
  5. Autophagy (2010): Alirezaei M, Kemball CC, Flynn CT, et al. Short-term fasting induces profound neuronal and systemic autophagy. Autophagy. 6(6):702-710. PubMed 20534972 • DOI
Aly Owen, MS, CNS

Aly Owen, MS, CNS

✓ Medically Reviewed & Fact-Checked
Lead Clinical Nutritionist & Fasting Specialist

Aly Owen, MS, CNS, specializes in metabolic health, circadian fasting schedules, and nutritional biochemistry with over 8 years of clinical experience. She directs FastingTracker’s medical review board and scientific fact-checking.

⚠️ Medical Disclaimer: This article is for informational and educational purposes only and does not substitute professional medical diagnosis, advice, or treatment. Consult a physician before undertaking significant fasting.
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