How to Start Intermittent Fasting for Beginners (Step-by-Step)

Most people start intermittent fasting the wrong way — they jump straight to 16 hours on a Monday, feel awful by Wednesday, and conclude that fasting "isn't for them."

It's not that fasting didn't work. It's that they skipped the steps that make it work.

Here's the correct way to start.

Step 1: Fix Your Food First

This is the step most guides skip entirely — and it's the most important one.

Before you change when you eat, you need to change what you eat. Here's why: if your diet is full of bread, pasta, sugar, and processed food, your insulin levels stay high even hours after your last meal. When you try to fast, blood sugar crashes hard, triggering intense hunger, brain fog, and irritability.

Fix the food and fasting becomes natural. Keep eating junk and fasting feels like punishment — every single day.

What to eat:

• Healthy fats: ghee, butter, olive oil, avocado oil
• Quality protein: all meats, eggs, seafood
• Vegetables (all except potatoes)
• Fermented foods: kimchi, sauerkraut, plain yogurt
• Cheese and butter (no milk)

What to cut:

• Sugar in all forms
• Bread, pasta, rice, grains
• Packaged and processed foods
• Seed oils (vegetable, canola, sunflower)

Spend 3–5 days eating this way before you change your eating hours at all. Your body will already start shifting into a better metabolic state.

Step 2: Stop Snacking

If you're currently eating three meals plus snacks, the first move is simple: stop snacking.

Just eat three proper meals a day using the food formula above. Nothing in between. This alone starts to train your body to go longer without food and lets insulin come down between meals — something it can't do when you're snacking constantly.

Give this 2–3 days before moving to the next step.

Step 3: Gradually Push Your Eating Window

Now you start compressing when you eat — but gradually, not all at once.

Week 1: Push breakfast 2 hours later than usual. If you normally eat at 8 AM, move it to 10 AM. Keep your other meals roughly the same.

Week 2: Push breakfast to noon. You're now eating from 12 PM to 7 PM — a 7-hour eating window, 17-hour fast. For most people, this is where the real benefits begin.

Week 3: If you're ready, compress further — eat from 2 PM to 6 PM, or eventually just one meal a day.

There's no rush. Moving too fast causes unnecessary discomfort. Moving at the pace your body is ready for means you barely feel the transition.

Step 4: Know What to Expect in the First 10 Days

Days 1–3: Your body is still adapted to burning glucose. You may feel mild hunger, slight headaches, or low energy at your old meal times. This is normal — it's your body adjusting, not breaking.

Days 4–7: The hunger starts to calm. Energy stabilises. You may notice your mind feels clearer during the fasting window.

Days 8–14: Most people experience a clear shift here. The fasting window starts to feel natural. Hunger during fasting becomes mild or disappears. Many people report feeling more focused and energetic than they have in years.

The first week is the hardest. Push through it, and fasting becomes easy.

Step 5: Drink Correctly

During your fasting window, you can have:

• Water (still or sparkling, no flavouring)
• Black coffee (no milk, no sugar)
• Plain herbal or green tea

That's it. Anything else risks breaking the fast. See what you can drink during intermittent fasting for the full breakdown.

Step 6: Don't Announce It

This sounds strange but it's important. When you tell people you're fasting, their reactions — even well-meaning ones — create social friction that makes it harder to stay consistent. People question you, offer you food, or share their own strong opinions about skipping meals.

Keep it private for the first few weeks. Act like nothing special is happening. Let the results speak for themselves.

What Protocol Should You Start With?

Start with 14:10 (14-hour fast, 10-hour eating window). For most people eating three solid meals, this is barely a stretch — you're essentially extending overnight fasting by a few hours.

Once that feels easy, move to 16:8 (fast for 16 hours, eat within an 8-hour window). This is the most popular and well-researched protocol, and where most people get consistent results.

Don't start with OMAD (one meal a day) or 24-hour fasts. These are advanced protocols. Starting there guarantees a miserable first week and a high dropout rate.

For a more detailed look at choosing the right protocol, see what is intermittent fasting.

The Most Important Rule

Knowledge beats willpower every time. Most people who struggle with fasting are fighting against their own body chemistry because of what they're eating or how fast they jumped in. Fix those two things and fasting becomes the easiest lifestyle change you've ever made.

Want the complete system? Intermittent Fasting in Practice by Mehrdad Jamshidi walks you through exactly how to build a fasting routine that sticks — from your first week through months of consistent results. Get it on Amazon and claim 3 months free app access at /redeem.

Frequently Asked Questions

How many hours should a beginner fast? Start with 12–14 hours, which includes overnight sleep. Most people are already fasting 10–12 hours without realising it. Extend by 2 hours and you're already doing a meaningful fast.

Should I fast every day? Yes — consistency is what produces results and builds the habit. Fasting one day and not the next keeps your body in constant adjustment mode and makes it harder, not easier, over time.

Can I have coffee in the morning before I break my fast? Yes — black coffee only, no milk or sugar. It won't break your fast and can actually reduce hunger during the fasting window.

What if I feel dizzy or weak while fasting? This is usually dehydration or an electrolyte imbalance. Drink more water and consider adding a small pinch of sea salt. If it persists, you may be extending your fasting window too quickly — slow down.

How long until I see results? Most people notice changes in energy and hunger within 5–7 days. Visible body changes typically start appearing after 2–4 weeks of consistency. See how long until you see results with 16:8 for a realistic timeline.

This article is for informational purposes only and is not medical advice. Always consult a qualified healthcare professional before starting any fasting protocol, especially if you have an existing health condition.