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How to do Intermittent Fasting for Fat Loss


For me, skipping breakfast and eating big meals in the evening is the key to easy fat loss.

I first learned about Intermittent Fasting in the summer of 2013 when I came across Kinobody. Greg was doing it for a few years and I decided to give it a shot. After trying IF for one week, I never went back to eating in the morning.

In this post you’ll learn pretty much everything you need to know about Intermittent Fasting:

  • why it makes cutting easier
  • how to use it for fat loss
  • how to structure your meals around training
  • how IF affects muscle growth, muscle retention and metabolic rate

Let’s get started !

The Benefits of Intermittent Fasting for Fat Loss

Let’s first get one thing straight.

The calorie deficit is what produces fat loss, not intermittent fasting.

I often get questions like these: “I’m no longer losing weight on IF ! I don’t eat until 3 PM, why am I not losing fat!?”

Fat loss is all about your calorie intake. Fasting for a few hours every day doesn’t burn body fat if a calorie deficit is not present.

Check out the hierarchy of importance for cutting for a visual presentation:

cutting hierarchy of importance1

As you can see results come from sticking to the macros and strength training. Nutrient timing (where Intermittent Fasting fits into) is close to the top of the pyramid – it doesn’t affect results in and of itself.


The great benefit of IF is that it helps you better manage your hunger and cravings. By skipping breakfast we take advantage of the fact that most people are not hungry in the morning and can save more calories for the second part of the day. Ironically, short-term fasting actually blunts appetite and you can easily go a few hours without food in the morning.

Eating most of our food in the second part of the day helps a lot with comfort and satiety.

Most people are genetically and socially inclined to eat more in the evening. You never hear of someone saying they binged like crazy in the morning or afternoon. No. Binge eating happens at night.

Some researchers speculate that this is the way our species evolved – we would hunt or gather food during the morning hours and only get to eat in the second part of the day. If you think about it, this way of eating also fits our lifestyle today. In the morning and noon we go to work, or school and are generally busy. Only in the second part of the day we have time to cook and eat a good meal.

Moreover, almost every social event we attend (weddings, parties, dinner with the family or friends, going to movies, etc) happens in the evening. That is why it makes sense to save a good portion of our calorie budget for the evening meal.

So Intermittent Fasting makes sticking to the deficit easier. But it’s not what produces fat loss. You can read more about this in the article Meal Frequency & Food Distribution when Cutting

In short, the benefits you get out of doing IF are these:

  1. Better hunger control because of the fasting period
  2. You’ll find it harder to overeat because your eating window is only a few hours long
  3. You have more calories to work with for each meal which means more satisfying meals
  4. Less time spent preparing and eating food – more productivity
  5. You can save enough calories for the evening meal to allow eating out
  6. Eliminates the need for cheat-meals. You can make your meals so large they feel like cheat meals

How to do Intermittent Fasting for Fat Loss

You’ve learned the benefits of IF, now let’s see how to actually do it.

The Intermittent Fasting style I recommend you follow is the Kinobody Guide to Intermittent Fasting. This is what I do myself.

In short this is how you do it:

  1. Don’t eat for 4-6 hours after waking up.
    You don’t need to break your fast at the same time every day, you just need to push your first meal back a few hours.
  2. Drink a few tall glasses of water and a cup of coffee during the fast.
    Studies suggest that thirst is most of the time confused with hunger. Most people living in developed countries are actually chronically dehydrated but they don’t realize it. We end up consuming food when in fact we need water. By getting into the habit of drinking water as soon as you wake up, you eliminate that false sensation of hunger we have in the morning.
    Sparkling water works great during the fast because it fills you up a little. Whatever hunger you had will be completely eliminated.
    Then about 2 hours after waking up have a cup of black coffee. Coffee without sugar or milk is a powerful appetite suppressant. The combination sparkling water and black coffee makes fasting 4-6 hours completely effortless (I’d even say enjoyable!).
  3. Have 2-3 meals in the second part of the day – what you’d call the feeding window. I recommend using any one of the 3 templates below to get started.Personally, I use template 1 the most.Template 1:12-2 PM – First meal of the day (30% of daily calories)
    4-6 PM – Second meal (30% of calories)
    8-9 PM – Final meal (40% of calories)Template 2:12-2 PM – First meal of the day (15% of daily calories)
    4-6 PM – Second meal (60% of calories)
    8-9 PM – Final meal (25% of calories)Template 3:12-2 PM – First meal of the day (40% of daily calories)
    6-9 PM – Final meal (60% of calories)
  4. Experiment and see how you like to split your macros for each meal.
    Enjoying your fat loss diet almost guarantees that you’ll get as lean as you want. I spent 2 years experimenting to see what meal pattern satisfies me the most in a deficit.
    What I discovered I enjoy most is this:
    In my first meal I have lean protein and veggies – medium protein, medium fiber, low carb, low fat
    In my second meal I get high fat foods or desserts – low protein, high fat, medium carb
    And in my last meal I get most of my protein and carbs – high protein, high carb, low fat, low fiber
    This way every meal has something special. You can do this too, but also experiment and see what you like most.
  5. Workout anytime after your first meal or immediately before it.
    Intermittent Fasting and training is a long subject so let’s address it separately in the next section.

This is how Greg and I do Intermittent Fasting. It’s simple and effective.

When to work out while doing Intermittent Fasting

Workout anytime after your first meal or immediately before it. This is the only guideline for training.

Recent evidence shows that nutrient timing and protein timing around your workouts is not as important for muscle growth as we initially thought. Hitting your macronutrient targets for the day is way, way more important than when you eat.

However, to maximize results it is recommended that you don’t delay your post-workout meal more than 2 hours if you didn’t have a pre-workout meal that day.

With IF you can train anytime you want after your first meal. You can even train after your last meal as you’d have all the nutrients in your body, they wouldn’t have been digested and absorbed yet. By the time you finish your workout you’ll have a lot of amino-acids in your blood and protein synthesis can start.

But if you train early in the morning, it’s not ideal to delay eating until lunch. You will still make gains of course.  Protein synthesis starts to climb 3-4 hours after training, peaks at the 24 hour mark and then steadily decreases until it goes back to baseline 36-48 hours after training. But if you’re an experienced lifter that is close to his genetic potential, delaying your post workout meal may compromise the rate of muscle growth a little.

If you must train early in the morning, then I recommend having a protein shake after your workout. You wouldn’t be fasting anymore but you’d still save most of your calories for the evening meal – reaping the adherence benefits.

Should I workout fasted while doing Intermittent Fasting?

It’s not mandatory or beneficial. Based on what I know and experienced, fasted training is not much different from fed training when training volume is relatively low.

Fasted training is slightly superior for fat mobilization.

Fed training is definitely superior for doing high volume workouts.

I personally workout both fasted and fed, depending on my schedule. In all my workout videos I am fasted because we film in the morning when the gym is empty. When we’re not filming I workout after my first meal, around 4 PM. I make good gains regardless.

I would say this decision is up to you. If you like training fasted do it. If you like training in the evening, do that instead.

Intermittent Fasting and Body Composition

Fasting for 4-6 hours in the morning doesn’t have any negative effects on body composition, muscle growth, or metabolic rate. You can learn why by reading Martin Berkhan’s epic article Top 10 Fasting Myths Debunked.

Small meals do not ramp up the metabolism neither are they better for appetite control, eating in the evening doesn’t make you fat, short-term fasting doesn’t lead to muscle loss and you don’t need to eat protein every three hours to maintain your muscle mass.

Meal frequency and food distribution don’t affect fat loss and body composition. 2-8 meals per day will yield pretty much the same results for fat loss and muscle retention.

Problems start to appear when you go the extremes. Eating only one meal a day will cause you to develop unhealthy relationships with food where you train yourself to consume enormous amount of calories at each sitting. On the other hand, eating more than 6 meals a day creates the opposite problem. You think about food all the time because you’re having very little meals every hour or two that don’t satisfy you. Either end of the spectrum makes adherence to the calorie deficit more difficult.

Recently, the awesome researchers Alan Aragon, Brad Schoenfeld and James Krieger recently did a meta-analysis that looked at the effect of meal frequency on body composition. They found no difference. Their conclusion was this: Given that adherence is of primary concern with respect to nutritional prescription, the number of daily meals consumed should come down to personal choice if one’s goal is to improve body composition.


What’s your take on Intermittent Fasting for Fat Loss? Do you have any questions? Anything else to add? Leave a comment below and let me know! 

The Aggressive Fat Loss Program

This is best diet Intermittent Fasting diet I know and the program I’m using right now.

Some of you asked me why I don’t create my own fat loss program. It’s because I haven’t found a way to improve this one. I’m not going to rip Greg off.

His approach is unique:

  • fasting 4-8 hours in the morning
  • black coffee during the fast
  • sparkling water to fill you up
  • fruit snaking to delay meals
  • splitting your protein and carbs in your big meal to maximize satiety

At first glance these seem like unimportant things but believe me they make a world of difference.

I highly recommend you check out this program. You can learn more about it here.


  1. Alex on February 10, 2016 at 11:08 am

    So if i do intermittent fasting but eat the same amount of food, there will be no changes, right??

    • Radu Antoniu on February 27, 2016 at 4:41 pm

      In terms of fat loss probably not. But IF makes it much more enjoyable to eat in a deficit

  2. chris on February 10, 2016 at 2:20 pm

    Hello Radu. Chris here, I wanted to ask you what is your opinion zero calorie coke. Can i have it after a meal or it raises insulin because of the Aspartame leading me to store fat?

    • Radu Antoniu on February 27, 2016 at 4:43 pm

      Hey Chris,

      Zero calorie beverages don’t lead to fat gain. You can have zero coke and not get fat. However, until we have more research on the long term health effects of artificial sweeteners I would avoid them. Personally I have zero coke 4-5 times a month

  3. Jennifer on February 26, 2016 at 11:49 am

    I really enjoyed reading he information that you have provided on IF and have downloaded your free materials. I wonder if you have more information gear to woman and how we can also achieve a lean body of 11%- 15% BF. I am a mother of 2 (15 & 12 years old), 5 feet 2 inches. I am about 120 Lbs. My BF is about 22%. My waist measurement id 26 inches. Any advice and information you can provide would be helpful. Thanks!

    • Radu Antoniu on February 28, 2016 at 5:00 pm

      Thanks Jennifer! Glad you liked it!

      At the moment I only provide content for men. Maybe I’ll write from women too in the future 🙂

  4. Jennifer on February 26, 2016 at 5:57 pm

    I really enjoyed reading the information you have provided on IF and have downloaded your free materials. I wonder if you have more information gears to woman and how we can also achieve a lean body of 11%- 15% BF. I am a 46 years old mother of 2 (15 & 12 years old), 5 feet 2 inches. I am about 120 Lbs. My BF is about 22% from the reading of the machine at the gym (the one that you step on to measure your BF). My waist measurement go from 25.5 to 26 inches. I go to the gym 6 days/week, doing 3 days of strength training and 3 days of cardio. I have also started IF about 4 weeks ago with fasting to 24 hrs from one to two days. I see little progress in gaining lean muscle, especially in my triceps area. Any advice and information you can provide would be helpful. Thanks!

  5. David on February 27, 2016 at 11:38 am

    Hi Radu, I’m enjoying your videos, simple and straightforward!
    Im going to start intermittent fasting, i have a 9-5 office job so i’m concerned my 1st big meal at 12-2pm is going to put me to sleep e.g blood sugar spike and drowsiness. Have you experienced this? and have you got any tips?

    • Radu Antoniu on February 28, 2016 at 5:03 pm

      Thanks David!

      Make the 12-2pm small. I get sleepy if I eat a lot at lunch too. I solved the issue by having a meal that is only 500-700kcal and includes very little carbs. I recommend making that meal mostly protein and veggies.

  6. Andrei on February 29, 2016 at 10:21 am

    Hey Radu, do you mind helping me decide what my next step is?
    This is my current condition and I am 150 lbs at 5’8″. I asked most people and they are telling me to move to GGP but I feel like maybe I am not lean enough at 10%? (I feel maybe I am at 12-13% now) I dont have to be crazy shredded but I do want my bulk to be longer term and I really would like to get vascularity and be at a healthy BF! What do you think I should do? Thanks a lot for your help!

  7. Vlad on March 7, 2016 at 8:23 pm

    Hy ! How should I do my Intermittent Fasting if my wake up time its alternate day by day ? Should i have a specific time when i take the first meal or should i fast for 6-7 hours before i take the first meal every day( but this means that one day i will eat between 01-02 pm and the other day between 03-04) ? Could you give some sugestion ? Thank you

  8. duncon on March 16, 2016 at 7:26 am

    I tried IF for almost 3 years and start following MEGA Training. I’m loosing weight and getting small and skinny but my lower abs and side obliques still sagging and bloating (don’t know if fat or skin). What should I do? I’m already eating below my maintenance calories and my muscle shrink too. Please help me

  9. Shiv on May 14, 2016 at 5:34 am

    Hi Radu.

    Great work as usual from yourself.

    My question: if training fasted in the morning after a large meal the night before (so train 8-10 hours after meal) and then staying fasted after workout until evening (also maybe using low calorie bcaa’s during and after workout, and having water and black coffee during fast)….

    does this approach above increase/suit fat loss more, as being fasted longer during the day especially after a workout (please note my my main focus currently is losing fat and weight)…?

    Thanks bro.


  10. Ralph on May 20, 2016 at 9:44 am

    Hello Radu , Love your videos – I’m a fan from Dubai.
    I’ve just commenced IF and wanted to know if it’s okay to have a protein shake right after my workout – which I do first thing , early in the morning. I have come across quite a lot of articles saying that – the Idea for IF is not to consume anything , however on the other hand I’ve read people saying to give it a try since everyone’s body is different in it’s own way. Do let me know Radu , when you can – I’ve tried many times to shed my excess bf however I have been unsuccesful.
    Thanks & looking forward to hearing from you.

  11. Leon on June 6, 2016 at 9:30 am

    Hi Radu, I like your view that IF is great for managing hunger. I agree that many people aren’t that hungry in the morning, so skipping breakfast is easier than other times. Also, people are too busy in the morning sometimes, so they skip breakfast anyway even if they weren’t fasting. Might as well get some health benefits out of it, right? 😉

  12. Kamal on August 9, 2016 at 8:51 am

    But black coffee got me acidity and stomach pain during the fasting period. No one else faced this?

  13. Niharika on February 5, 2017 at 7:57 pm

    A splash of milk in coffee along with a pinch of sugar free natura break my fast ?

    • Radu Antoniu on February 8, 2017 at 4:56 pm

      Nope, that’s perfectly fine!

  14. lincoln on February 27, 2017 at 8:49 am

    hi! just purchased Kinobody and saw this thread.

    My question is regarding post workout meals. In your video @ 4:03 you had mentioned not recommending holding off on your post workout meal until lunch. I’m not sure if I understand what you are saying.

    Ex- if I wake at 8:00 am and start my workout at 8:30 am should I consume any food for my post workout or no? Do I wait for to feed four hours after I wake? sorry just trying to get the basics down before I start IF.

    Thank you for the awesome content.

  15. Bulwark on April 20, 2017 at 10:00 am

    So I have been doing this for a few days now, It’s really good and super helpful to reduce the urge to overeat. I split up my daily 1500 calories into 2 large meals, (still having a few calories left over for something else). But this doesn’t really change anything apart from satiety and mental satisfaction right?because it really does feel like cheating

  16. Sergio on May 4, 2017 at 2:03 pm

    Let´s see. I sleep around 10 – 10.30pm awake 4.30am to go to train I ran from 5 – 6 am plus 1 hr of bike or core workouts plus 1 hr of swimming. Can I break the fast until 1 pm with all that previus work ??? I´m aiming to a 2150Kcal/day with allready deficit of 30% Do you see logic in that or am I missing something? I have really enjoy all of your videos..

  17. Ab on July 17, 2017 at 6:09 pm

    Hi Radu,

    From what I thought I knew, skipping breakfast was the worst meal to skip if you’re trying to cut, because if you don’t eat in the first hour of being awake your body responds as if to a famine and starts to drastically conserve body fat (switching to muscle as the main energy source). So I thought missing breakfast would have a completely negative affect on your metabolism and make you less able to burn fat and maintain muscle mass…

    Any thoughts on this?

    Love your youtube vids btw man, keep it up!

  18. TRISTAN JAMES on August 22, 2017 at 12:35 pm

    Hi Radu, i just ready your article regarding for Intermittent Fasting for Fat loss same as Greg. But i have a question, im out in the Office around 6pm night is it okay to train that time then after that eat may 3rd (last) meal of the day?

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