Intermittent fasting (IF) is not a diet — it is a schedule for when you eat. The simplest version, 16:8, means fasting for 16 hours and eating within an 8-hour window. Here is how to build your own plan.
The Popular Protocols
| Protocol | Fast | Eat | Best For |
|---|---|---|---|
| 12:12 | 12 h | 12 h | Beginners |
| 14:10 | 14 h | 10 h | Easy entry |
| 16:8 | 16 h | 8 h | Most people |
| 18:6 | 18 h | 6 h | Experienced |
| 20:4 | 20 h | 4 h | Warrior diet |
| 24 h (OMAD) | 24 h | 1 meal | Advanced |
How Fasting Works in Your Body
After your last meal, insulin drops over a few hours. Roughly 8–12 hours into a fast, glycogen stores run low and your body shifts toward burning stored fat — the metabolic state of fat oxidation. Deeper in, ketone production rises.
Building Your Schedule
Pick a fast start time that fits your sleep. Example: last meal at 20:00, fasting 16 hours → first meal at 12:00 the next day.
A sample 16:8 day looks like this:
- 12:00 — first meal (lunch)
- 16:00 — light snack
- 20:00 — dinner, last food of the day
- 20:00 → 12:00 — fasting (includes sleep)
The beauty: 7–8 of your fasting hours happen while you sleep.
What You Can Consume While Fasting
Calories break the fast, but these are fine:
- Water, black coffee, plain tea — zero-calorie, don't spike insulin
- Electrolytes — salt water helps avoid headaches
- Avoid — milk, sugar, juice, and even some sweeteners
Does IF Really Help You Lose Weight?
Only if it creates a calorie deficit. IF works for most people because it naturally removes evening snacking and makes portion control easier. It is not magic — it is a structured way to eat less.
💡 Pro Tip: Start with 14:10 for the first week, then step up to 16:8. Jumping straight into OMAD is how people quit on day two. Consistency beats intensity.
Try Our Tools
- Intermittent Fasting Calculator — get your exact schedule
- Calorie Calculator — find your TDEE for the eating window
- Sleep Calculator — align your fast with quality sleep
*Build your fasting schedule in seconds with our free Intermittent Fasting Calculator.*
