16:8 Intermittent Fasting: Complete Guide, Benefits & Meal Plan
✨ 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.
In This Article
16:8
Fast: 16h | Eat: 8h
Eating window: 12:00 PM–8:00 PM
The 16:8 intermittent fasting method — also called the Leangains protocol — is the most popular form of time-restricted eating (TRE). You fast for 16 hours and eat within an 8-hour window.
Science-Backed Benefits of 16:8 Fasting
- Fat loss: A 2020 study in Cell Metabolism found 16:8 reduced body weight by 3% and visceral fat by 4% in 12 weeks without calorie restriction.
- Insulin sensitivity: Fasting lowers fasting insulin by 20–31%, reducing type 2 diabetes risk.
- Autophagy: After 14–16 hours of fasting, cellular self-cleaning activates — the mechanism that won the 2016 Nobel Prize.
- Brain health: 16:8 increases BDNF by up to 400%, sharpening memory and focus.
- Heart health: Reduces LDL cholesterol, triglycerides, and inflammatory markers.
How to Start: Step-by-Step
- Week 1: 12:12 — eat 7 AM to 7 PM.
- Week 2: 14:10 — push breakfast to 9 AM.
- Week 3: 16:8 — eat 12 PM to 8 PM.
- Drink 2–3L of water daily.
- Break your fast with protein-rich foods.
Sample 16:8 Meal Plan (1,600 kcal)
12:00 PM: Oatmeal crepe with smoked salmon + avocado — 380 kcal
3:00 PM: Quinoa bowl with grilled chicken + vegetables — 450 kcal
6:00 PM: Greek yogurt + walnuts + berries — 200 kcal
7:30 PM: Baked salmon + steamed broccoli + asparagus — 370 kcal
Common Mistakes to Avoid
- Breaking fast with sugar or refined carbs
- Eating too few calories — minimum 1,200 kcal (women) / 1,500 kcal (men)
- Not staying hydrated
- Giving up in week 1 — hunger normalizes in 7–14 days
📚 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
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