Methods

The Warrior Diet: Complete 20:4 Fasting Guide

Discover the Warrior Diet, a 20:4 intermittent fasting method. Learn how it works, what to eat, and whether this ancient eating pattern is right for you.

13 min readUpdated January 2, 2026

The Warrior Diet is a form of intermittent fasting based on the eating patterns of ancient warriors. It involves a 20-hour fasting period with a 4-hour eating window, typically in the evening.

How the Warrior Diet Works

During the 20-hour undereating phase, you can consume small amounts of raw fruits, vegetables, or light protein. The 4-hour overeating phase allows you to eat one large meal or several smaller meals.

The Three Phases

  1. Detox Phase (Week 1): Focus on detoxifying foods, avoid grains and starches
  2. High Fat Phase (Week 2): Add healthy fats, still minimize carbs
  3. Concluding Phase (Week 3+): Cycle between high-carb and high-protein days

Benefits of the Warrior Diet

  • Extended fasting benefits (20 hours)
  • Aligns with natural circadian rhythms
  • One main meal simplifies food prep
  • Enhanced nighttime digestion
  • Potential for improved energy during the day
  • Evening eating fits social schedules
Not for BeginnersThe Warrior Diet is challenging. Build up to it gradually through 16:8 and 18:6 fasting before attempting 20:4.

Related Topics

warrior diet20:4 fasting20 4 intermittent fasting4 hour eating window

Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. Always consult with a qualified healthcare provider before starting any fasting regimen.

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