Ease Into It: How to Start Intermittent Fasting

Intermittent fasting (IF) is one of the most powerful ways you can lose fat, gain muscle and live a generally healthier, more productive life.  Sounds too good to be true, huh? Well, it's not. By simply restricting the times you eat and eating a mostly healthy foods when you do eat, you can get into the best shape of your life.

But you already know this. That's why you're reading this article. (If you don't know about IF and want to learn more, read this.) You're here because you want to learn about how to IF. The best way is to embrace it as a lifestyle change, as opposed to a diet. We know, we know: everyone flogging any type of dietary change says this and the phrase has lost all meaning.

Here's what we mean when we say IF is a lifestyle. It means you're not going to IF all the time; there are days you're going to eat outside your feeding window, because you have to or are just too damned tired, stressed, and human to be perfect all the time. And that's cool. You don't have to IF every day to lose weight. In fact, people see results intermittent fasting as little as two days a week.

What embracing IF as a lifestyle also means is that you don't have to restrict the foods you eat unless you want or have to. You can eat meat. You can eat carbs. You can eat chips and cookies and cake. As long as you eat mostly healthy foods (80%+ whole, healthy), you'll see results. A flawlessly clean diet isn't necessary. A balanced diet is.

So, you're going to make a lifestyle change and you're going to do it gradually. The most common (and our preferred) kind of IF is 16:8. This means you fast 16 hours a day, and eat for 8. During the periods of fasting, you can drink water, black coffee or tea, but you cannot eat or drink anything with caloric value or anything that can affect your blood sugar levels. It's easier than you may think, especially because most of us sleep for at least half of the 16 hours of fasting.

How to Start Intermittent Fasting

Step 1: Find Your Windows

First thing you have to do is find your feeding and fasting windows. They can be whenever you want. That’s right: whenever. There’s no proof eating late at night causes weight gain unless you are eating too many calories in general, so, as long as you are limiting your feeding window to 8 consecutive hours a day, it doesn’t matter when the window is open.

Our best advice for finding the right windows for you is to take a good, long look at your life and decide what would work realistically for you. For example, if you are a night owl and rarely go to sleep before midnight (or later), your fast could start around 10pm and go until 2pm the next day. If you are getting a decent sleep, this only gives you approximately 6 hours when you’re awake the next day and not eating. That’s it.

Another example: you go to bed each night around 9pm. In this case, you could stop eating at 6pm and eat the next day at 10am. Again, you get to pick your fasting and eating slots to suit your life.

Step 2: Stagger Your Start

While a good many people do IF every single day (or close to it), you don’t have to IF every day to see results. In fact, if you have never fasted before (beyond the usual overnight fast when you sleep), it’s a good idea not to throw yourself into IF. Instead, try IF for one or two nights, then take a night off. See how you feel. Adjust times if necessary. Some studies suggest that because of hormones, women may have a harder time fasting for 16 hours. Try for 14 hours if you’re feeling really hungry and agitated or lightheaded. Or 12. There’s absolutely nothing wrong with working your way up to 16. Or sticking to 14. Or sticking to 14 most of the time and pushing to 16 once or twice a week.

If you are having no trouble fasting for 16 hours off the hop, go for it! But keep reading: the next step is crucial.

Step 3: EAT During Your Eating Window

You only have 8 hours to eat, and while this may seem like a lot of time, it isn’t. You’re going to have to make sure you eat frequently during your feeding window. Because you want to get in all your macronutrients and micronutrients during this time, it’s important to eat predominately whole, clean foods. These are the foods full of the fibre, whole grain carbs, proteins and healthy fats that will keep you fuller, longer. Yes, like in any balanced diet there is room for treats, but again, these should constitute a small percentage of your overall diet.

There is no prescribed number of times you should eat during your feeding window. Two snacks and one big meal. Five little meals. Three medium sized meals. The choice is yours.

Step 4: Get Your Mind Right

One of the most challenging aspects of IF is learning the difference between real hunger and psychological hunger. Psychological hunger is a conditioned or external response rather than a real, physiological need. You want to eat because you've been conditioned to eat at a certain time or because you're sad or tired or angry or happy or just because there's delicious food in front of you. But what you are not is truly hungry.

When you IF, and if you are doing it properly and eating enough good, clean food during your feeding window (and yes, an indulgence now and then), you will never go hungry. However, you may feel hungry  — especially during the first few days of IF while your body adjusts. But it will adjust. Thank increased willpower due to clearer cognitive function and a change in your body’s secretion of ghrelin, the hunger hormone. The more you can avoid answering the urge to eat, the more your ghrelin timing and production will adjust. As a result, you’ll condition your body and brain to embrace the new fasting schedule.

Step 5: Stick to HIIT

HIIT and IF are a match made in fat loss heaven. Any healthy lifestyle necessitates activity. IF is no exception. What is different about IF is the intensity and type of activity that best compliments the practice  — and this difference is refreshing. Unlike other programs that call for rigorous, prolonged activity almost every day of the week, the exercise that best suits an IF lifestyle is wonderfully minimal and rewardingly effective.

3-4 days a week

That’s all you need to do. Three or four days a  week of short, intense periods of training. No cardio sessions necessary. We’re talking HIIT. HIIT workouts and intermittent fasting work beautifully together to help you lose fat, gain muscle, increase aerobic and anaerobic capacity, and keep your hormones in check.

Ready to start? Of course you are  — and we’re here to help. Soon we are launching our NEW Fasting Guide, where you'll be able to find all this information. It’ll be everything you need to help transition into a long-term IF lifestyle, offering recipes, guidance, tips and the science behind IF.  


Wonderful and informative article. I was hoping to read more, but the link in the second paragraph leads to an error message and no article.

Noreen May 03, 2019

IF is also one of the documented life extension protocols.
The extra health benefits occur thru a process called autophagy.
Both IF and HIIT work in the same way to induce autophagy.

phil April 08, 2019

How can I incorporate IF when I do my workouts in the mornings (6-7am). I need my post PROTIEN shake for recovery. Could that still work? Can I still take it without affecting IF and not eat an actual meal until it’s time?
Thank you!
Love your articles! :)

Jessica April 08, 2019

My husband tried IF a few years ago and lost 15 lb very quickly, but felt like he was weaker lifting weights so he stopped. he does it every now and again. My only dilemma in trying it is that I prefer to work out in the mornings, and there’s NO WAY I can do bodyrock fasting. I’ll faint for sure! Or just feel weak and tired and not be able to get through it.

Gilda V April 04, 2019

This is great info Team BodyRock!!
I practice intermittent fasting Mondays, Wednesdays, Fridays, I fast 12:12 and on Tuesdays and Thursdays I go for 24 hours. On these days I do my SweatFlix workouts using the drop weight training method.
On the weekend I don’t fast but I still never go crazy with eating or trying to compensate by filling my stomach with unnecessary/unhealthy calories.
IF is always hard at the beginning. The deficit of calories mixed in with exercise may tend to cause weakness, diziness and hunger pains for some beginners. It did for me 8 months ago.
So, PLEASE listen to this article and start slowly and listen to what your body tells you.
For me a protein heavy meal or a protein shake is how I break my fast. This manages to keep me full for quite a while. I am a pescatarian and eat a heavily plant based diet. Yes, your type of diet is a big contribution towards what the benefits of IF can do for your health and your body. (Not to mention the changes you will see through training/workouts in your body)
In conclusion, in my experience I have gotten leaner, and getting toned to acheive muscular gains has never been easier.
IF ROCKS and so worth it!!!! 😁😘😉

Tenecia April 04, 2019

I have done IF in the past and have found that it, surprisingly, is quite ‘easy’ to work into. Does anyone have any advice, though, for an eating window for someone who does the majority of their weight training workouts in the morning (completed by 7 am)? Is it okay to wait until 10 am to eat when the recommendation has always been to have a balanced carbs/protein meal within 30 mins of completing your workout? Thanks :)

Jenn April 04, 2019

I’m so Freaking Pumped. I have been waiting for this launch since BR started talking about it. I can hardly wait to have the axcess to learn more, and START….

Thank you BR for always being there.

TASHA OLER April 04, 2019

I love IF. I’ve been on it for a couple years now. It works for me because I’ve never been a breakfast eater and not eating all day has never been hard for me. I follow IF more during the week because my time is more regimented. I drop it on the weekends and just try to watch what I eat. It has helped me maintain my weight through the winter and lose those extra pounds in the Summer when I’m able to just be more active outside as well as my usual workouts. I follow a little stricter IF window of 20:4. 10pm to 6pm the next day. I’ve always felt sleepy after eating as well, so this type of eating regimen has allowed me to stay alert and not feel sluggish or tired during the day. It’s certainly not for everyone and I understand that but if you’re able to, it’s a great way to shed those extra pounds and feel great in the process.

TRINA MEYER April 04, 2019

I’m ready

John Marks April 04, 2019

I have been trying this IE for over 200days now, started to exercise but no change on my scales or measures. I eat clean, trying to avoid process food but I think it is stress which does not let me get leaner. :(

Martina Pastorková April 04, 2019

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