# The 5:2 Diet Explained: Weekly Schedule & 600-Calorie Fast Day Menu

> The 5:2 intermittent energy restriction protocol lets you eat at normal maintenance calories 5 days a week while dropping to 500–600 high-protein, high-volume calories on two non-consecutive days (such as Monday and Thursday), creating a 3,000 kcal weekly deficit.

## Nutrition & Protocol Benchmarks

- Target Calories: 600 kcal
- Protein Target: 75g
- Prep Time: 15 minutes
- Fasting Window: 5:2

## Meal Benchmarks & Nutrition Scores

- **Fast Day Lunch (1:00 PM): 2 Boiled Eggs + 100g Curd Cheese + Big Green Salad** (350 g plate, 255 kcal, 31g protein, Score 96/100): Delivers 31g protein for just 255 kcal.
- **Fast Day Dinner (7:00 PM): 180g Grilled Chicken Breast + Steamed Broccoli** (380 g plate, 330 kcal, 44g protein, Score 97/100): Completes the 585 kcal fast day with 75g total protein.
- **Normal Day Meal (5 Days/Wk): Mediterranean Fish, Bulgur & Olive Oil Greens** (450 g plate, 640 kcal, 45g protein, Score 94/100): Eat normal maintenance calories on the other 5 days.

## Protocol Summary & Metabolic Foundation

The 5:2 intermittent energy restriction protocol lets you eat at normal maintenance calories 5 days a week while dropping to 500–600 high-protein, high-volume calories on two non-consecutive days (such as Monday and Thursday), creating a 3,000 kcal weekly deficit.

Intermittent fasting is not a starvation diet—it is a structured **Time-Restricted Eating (TRE)** schedule that gives your digestive tract, pancreatic insulin secretion, and cellular repair pathways dedicated daily rest. In this guide to **The 5:2 Diet Explained: Weekly Schedule & 600-Calorie Fast Day Menu**, we focus on the **5:2** framework and **non-consecutive 600 kcal protein-sparing fast days (Mon/Thu) and weekly energy deficit math** so you can maximize fat oxidation while protecting lean muscle tissue.

## Fasting Window & Meal Benchmark Comparison

What you consume during both your fasting hours and your feeding window determines your physiological outcome:

| Window / Meal Benchmark | Portion / Timing | Calories | Protein | MewBite Score | Physiological Impact |
| :--- | :--- | :--- | :--- | :--- | :--- |
| **Fast Day Lunch (1:00 PM): 2 Boiled Eggs + 100g Curd Cheese + Big Green Salad** | 350 g plate | 255 kcal | 31 g | **96/100** | Delivers 31g protein for just 255 kcal. |
| **Fast Day Dinner (7:00 PM): 180g Grilled Chicken Breast + Steamed Broccoli** | 380 g plate | 330 kcal | 44 g | **97/100** | Completes the 585 kcal fast day with 75g total protein. |
| **Normal Day Meal (5 Days/Wk): Mediterranean Fish, Bulgur & Olive Oil Greens** | 450 g plate | 640 kcal | 45 g | **94/100** | Eat normal maintenance calories on the other 5 days. |

Comparing **Fast Day Lunch (1:00 PM): 2 Boiled Eggs + 100g Curd Cheese + Big Green Salad** (255 kcal, Score: 96/100) against **Normal Day Meal (5 Days/Wk): Mediterranean Fish, Bulgur & Olive Oil Greens** (640 kcal, Score: 94/100) highlights the exact boundary between staying in a fat-burning fasted state versus triggering an insulin excursion.

## Hour-by-Hour Physiology: Inside the Fasted State

1. **Hours 0–4 (Postprandial Absorptive Phase):** Nutrients from your final meal are digested and absorbed while insulin gradually begins to decline.
2. **Hours 4–12 (Glycogen Utilization & Gut Motility):** Pancreatic insulin drops toward baseline, the small intestine's **Migrating Motor Complex (MMC)** sweeps the digestive tract clean, and liver glycogen (~100g) fuels blood glucose.
3. **Hours 12–16 (The Metabolic Switch & Lipolysis):** Low insulin unlocks hormone-sensitive lipase (HSL), mobilizing free fatty acids and mild nutritional ketones (beta-hydroxybutyrate) for clean energy.
4. **Hours 16+ (AMPK Activation & Autophagy):** Rising AMPK and suppressed mTOR signaling accelerate cellular recycling and mitochondrial renewal.

## Step-by-Step Execution & Electrolyte/Muscle Rules

* **Prioritize Fasting Electrolytes:** Falling insulin signals your kidneys to excrete sodium and water ('natriuresis of fasting'). Prevent headaches and fatigue by drinking **2–2.5 L of water**, **sparkling mineral water**, and unsweetened black coffee or tea.
* **Break Your Fast Gently with Protein and Fiber:** Avoid opening your eating window with refined sugar or white flour; anchor Meal #1 with **Fast Day Dinner (7:00 PM): 180g Grilled Chicken Breast + Steamed Broccoli** and explore our [Nutrition Guides](/en/nutrition) and [High-Protein Recipes](/en/recipes) for meal inspiration.
* **Track Effortlessly in MewBite:** Use the built-in **MewBite Fasting Timer** alongside 3-second AI photo logging to coordinate your fasting hours, hydration, and daily protein rings in one place.

## Track & Personalize This in 3 Seconds with the MewBite iPhone App

You don’t need a kitchen scale or tedious spreadsheets to put this guide into action. **[Download MewBite on the App Store](https://apps.apple.com/app/mewbite/id6741752794)** to automate your entire fat-loss workflow:

- **3-Second AI Photo & Voice Logging:** Snap a picture of your plate or speak what you ate—MewBite instantly calculates calories, protein, carbs, fat, and your **0–100 Nutrition Quality Score**.
- **Live Intermittent Fasting & Hydration Timer:** Track 14:10, 16:8, or 18:6 windows in real time and see the exact hour you enter fat oxidation and autophagy.
- **Zero-Shame Habit Companion (Mew):** Replace punitive red calorie warnings with positive reinforcement—every logged meal and glass of water restores your 9-heart virtual cat **Mew**, while **Chef Mew** suggests high-protein meals tailored to your remaining daily macros.
- Want to check your personal TDEE calorie deficit right now? Try our interactive **[Macro Lab Calculator](/en#macro-lab)** on the homepage.

## FAQ

### Should the two fast days on the 5:2 diet be consecutive?

No—spacing them out on non-consecutive days (like Monday and Thursday) prevents fatigue and keeps workout intensity high.

### Can I eat unlimited calories on the 5 normal days?

You should eat around your normal maintenance TDEE on the 5 feed days so the 3,000 kcal deficit from your two fast days translates directly into fat loss.

### How can I track these meals and macros fastest in the MewBite app?

Simply snap a 3-second photo of your plate with the MewBite AI camera to automatically log portion weights, calories, protein, carbs, fats, and your 0–100 Nutrition Score without needing a kitchen scale.


## Sources

- [New England Journal of Medicine — Effects of Intermittent Fasting on Health, Aging, and Disease](https://www.nejm.org/doi/full/10.1056/NEJMra1905136)
- [Cell Metabolism — Clinical Trials on Time-Restricted Eating & Circadian Rhythms](https://www.cell.com/cell-metabolism/home)
- [Nobel Prize in Physiology or Medicine — Mechanisms for Autophagy (Yoshinori Ohsumi)](https://www.nobelprize.org/prizes/medicine/2016/press-release/)