What Can You Drink While Intermittent Fasting? The Definitive List (2026)
✨ 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.
During your fasting window, you can freely drink plain water, sparkling mineral water, unsweetened black coffee, and plain green or herbal tea. The fundamental rule of fasting hydration is zero calories and zero glycemic impact: any beverage containing carbohydrates, protein, or caloric additives triggers an insulin response that halts fat oxidation and breaks your fast.
⚡ Fasting Drinks Cheat Sheet
- ✅ 100% Safe (Green Light): Filtered water, mineral water, black coffee, green tea, black tea, peppermint/chamomile tea, apple cider vinegar (1 tbsp in water).
- ⚠️ Grey Area (“Dirty Fasting”): Bone broth (under 40 kcal), BCAAs, diet sodas with artificial sweeteners.
- ❌ Breaks Fast (Red Light): Fruit juice, milk, oat milk, almond milk, coffee creamers, sugary drinks, alcohol, coconut water.
Complete Fasting Beverage Guide & Matrix
Track Your Fasting Fluids
Calculate your exact hydration requirements with our Water Intake Calculator and track your fasts seamlessly with FastingTracker.
Download Fasting Tracker for iOS →Medical References
- Pietrocola F et al. (2014). Coffee induces autophagy in vivo. Cell Cycle.
- Dulloo AG et al. (1989). Normal caffeine consumption and thermogenesis. Am J Clin Nutr.
📚 Scientific Studies & Medical References (5 Sources) ▼
FastingTracker adheres to strict editorial standards, citing peer-reviewed clinical trials and authoritative medical institutions.
- 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
- 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
- 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
- Annual Review of Nutrition (2017): Patterson RE, Sears DD. Metabolic Effects of Intermittent Fasting. Annu Rev Nutr. 37:371-393. PubMed 28715993 • DOI
- 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
Join over 50,000+ people using Fasting Tracker to time eating windows, calculate ketosis stages, and hit your target weight.
Find Your Ideal Fasting Protocol
Answer 3 quick questions to calculate the safest and most effective intermittent fasting schedule for your body.
