Intermittent Fasting 101: The Basics On Fasting To Lose Weight

July 18, 2018 | 447 Comments


fasting to lose weight

Quick, if you told anyone that you were fasting to lose weight, they would probably think:

a) You’re crazy

or

b) You’re crazy

It’s sad, but anytime you tell someone that you’re fasting, the only acceptable reasons for doing so are for medical or religious reasons. If you even mention the words “weight loss” and “fasting” in the sentence, then you’re in for a world of hurt.

But in my opinion, fasting for the sake of weight loss isn’t crazy. Not at all.

In fact, strategically fasting everyday for 16 or even 24 hours can provide a whole host of benefits over the conventional “eat breakfast and 6 meals per day” saying.

fasting to lose weight
Couldn’t find a relevant picture, so um… here’s a hot dog.

Basics of intermittent fasting

So what exactly is intermittent fasting (IF)?

Simply put, IF is the act alternating periods of fasting (not eating) and eating. While there is no official IF program, most programs range from 12-24 hours of fasting.

So why is Intermittent Fasting awesome?

Well lets see:

  • You get to eat bigger meals
  • You get more work done since you’re not eating as often
  • You have more energy since you’re not bogged down by food
  • You get to stick your middle finger at every single fitness guru who says eating every 2-3 hours is absolutely necessary for good health

I could go on and on.

Is IF unsafe?

In short, IF is safe.

However, just like everything else in life, if you overdo it and take it to the extreme, then it will become dangerous. If an intermittent fasting program tells you to fast for 16 hours, you shouldn’t disregard that and decide to fast for 100 hours.

As long as you don’t do anything crazy like that, then there’s really nothing dangerous about IF.

But won’t fasting make me fat?

I never really saw the logic in this statement, but since when the hell did not eating make you fat?

But anyways, many people have this ludicrous belief that fasting will make them fat. This belief originates from mainstream media where they constantly promote the fallacy that fasting will force your body hold onto its body fat and make it burn muscle instead which is just incredibly stupid.

Will IF make me lose muscle mass?

When it comes to fasting, another popular myth that people believe is that fasting will make you lose all your hard earned muscle mass.  This is simply not true and as long as you perform of heavy resistance training 2-3 times per week, then you shouldn’t fear about losing any muscle mass.

If you need further proof, check out this research study. In it, scientists showed that even when people ate a super low calorie diet (800 calories per day), they were able to maintain all their muscle by lifting weights. The reason behind this is because the act of lifting weights sends a signal to your brain that you want to preserve all your muscle mass.

But don’t you need to eat more often to have more energy?

This is exactly what food companies thrive off of. They create all these products that target people who need a “quick energy boost” or a quick afternoon “pick me up”.

But in reality, these people probably don’t even need these products. They buy them because they fear that they’re suddenly going to crash and burn when in reality nothing is really going to happen.

If you just give your body a chance to experience what it’s like be without food every 2-3 hours you’ll realize that you’ll actually have more energy than ever.

Just give it a shot.

IF is just another way to eat

Even though I love IF and would NEVER go back to eating 6 times per day again, I have to admit, it’s just another tool. It’s another tool to help you lose/maintain weight.

Unlike most fitness professionals, I’m not going to tell you that it’s 100% necessary to do something. I’m not going to tell you that it’s absolutely mandatory to do IF because honestly, it’s not for everyone.

Some people just love to eat small meals every 2-3 hours, and if you’re one of those people, then that’s cool. I’m not gonna judge you.

But if intermittent fasting sounds good to you, then check out the 3 most popular IF programs below.

A look at various IF programs

Over the past couple of years, more and more fasting programs have come into the market. IF is slowly growing in popularity, but here are the 3 most popular forms of IF:

1) Eat Stop Eat

Eat Stop Eat was created by Brad Pilon is now arguably the most well known form of intermittent fasting. I’ve been using this program for the past 3 years, and if you read my blog often then you know that I absolutely love this program.

Brad Pilon
Brad Pilon – creator of Eat Stop Eat

Eat Stop Eat requires you to fast for 24 hours (e.g. 7pm on Sunday till 7pm on Monday) 1-2 times per week. On the other 5-6 days of the week, your main goal is to simply eat normal (maintenance calories).

The whole goal of fasting 1-2 times per week is to let those days create a calorie deficit of 10-15%.

Important Eat Stop Eat notes:

  • Even though you’re fasting for an entire 24 hours, this doesn’t mean you get a free pass to the all you can eat buffet. The main goal is to simply eat normal after each fast. Don’t over or under compensate for anything.
  • Despite fasting for 24 hours, you still get to eat every single day. So for example, if you start a fast on Wednesday night and end it on Thursday night, that means you get to eat a meal on Thursday night. Awesome, huh?
  • Eat Stop Eat is more of a lifestyle change than an actual diet since you’re only eating less for 1-2 days of the week.

You can red my review of Eat Stop Eat here.

2) Leangains

Leangains - Martin Berkhan
As you can see, fasting has made Martin a very fat man

And now we have Leangains created by the oh so famous Martin Berkhan (seen above).

But unlike Eat Stop Eat, Leangains has a much larger focus on pre/post workout nutrition and macronutrients.

With Leangains, you’re fasting every single day. Men will fast for 16 hours and women will fast for 14 hours.

While many people have effectively used Leangains to lose weight, many people have also used it to effectively pack on muscle mass. But not only is this muscle mass, it’s lean muscle, meaning minimal fat gains hence the term “Lean” gains. This is achieved though calorie and macronutrient cycling. If you’re ever looking for a program that lets you pack on muscle with minimal amounts of fat, then this one’s for you.

There are a couple different variations on Leangains, but all every one has you taking 10 grams BCAA before workouts.

I don’t want to delve into the rest of the details but if you’re interested in the rest of the Leangains protocol you can read the Leangains guide here.

3) Warrior Diet

Warrior diet
Ori hofmekler – creator of Warrior Diet

And lastly, we have the Warrior Diet created by Ori Hofmekler.

This form of fasting to lose weight isn’t as popular as the first two, but it was the first form of IF I tried and till this day, I still use it from time to time.

The Warrior Diet has you fasting for 20-24 hours every single day, so it’s similar to Eat Stop Eat in terms of the fasting length.

During your fasts you can still drink water and zero calorie drinks like tea, coffee, and diet soda.

But the main difference here is that you’re eating all your calories in 1 massive meal per day. The mainstream media will probably never promote this way of eating, but hey, it works.

I’ve done it in the past, and you really don’t feel hungry while fasting. Plus, every day is like a mini feast since you get to eat a crap ton of calories in one sitting.

4) Honorable mentions

Some other great intermittent fasting programs include:

So which program is best?

Whew, all this fasting talk has gotten me a little hot. And hopefully I’ve gotten you a little bit excited too, maybe even got your nipples hard.

But if you had to choose, which of the above 3 is the best intermittent fasting program.

Well… I don’t know.

It’s really a personal preference. I’m not going say that Eat Stop Eat is the absolute best IF program out there because it’s not. It’s one of the best, but it’s not the absolute best.

Some people don’t like to fast for 24 hours and that’s fine. In that case, you should try something more along the lines of Leangains.

And if someone likes to come home from work every day and just stuff their face with food, then the Warrior Diet is probably best for them.

In the end it all comes down to choosing a program that fits your lifestyle.

Fasting to lose weight = not crazy

Seriously guys, fasting is not as crazy as you think. You’re simply waiting longer between meals.

But to be able to effectively use intermittent fasting, you need to have an open mind.

You need to be able to let everything that you thought you knew about nutrition and dieting  behind and be able to step into this new world of “not eating”.

But trust me, once you starting fasting, you’ll never want to go back.

Have you ever tried fasting to lose weight? Did you like it? Let me know in the comments below.

447 Comments - Leave Your Thoughts

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  1. I fasted one to 2-4 days a week. And then ate my maintenance calories.on my other days.

    I did Chest, Shoulders, Tris on Monday, Tuesday I’d rest. Wednesday I’d do Back, Bi’s and Forearms, Thursday Rest, Friday legs, rest Sat and Sun then rinse and repeat.

    I also did my best to do alternating ab workouts 1 set x 30 reps every hour on the hour (where I could)

    This was after months of binge drinking and eating after the bars, etc for a few years. Took it’s toll.

    With that regimen I just mentioned, I legitimately lost 25-30 pounds a month. I was back in shape within 2 months. Only cardio I did was a 5 minute warm-up to get my blood/testosterone flowing and my heart rate up.

    This is about the 5th post of your’s I have read on your site and you are 5 for 5.

  2. im a 13 year old girl who is extremely into nutrtition and fitness and i fast usually once a week and i can say it builds self control as well, you learn to stop when you are full and your eating habits progress with intermittent fasting 🙂

        1. no 13 is super young. Your body is still developing so you shouldn’t be doing something hardcore like fasting to lose weight.

  3. Hi Keith,

    I’ve tried just having an 8 hour window (8 hour diet) and that seemed to work at first, but my body seemed to get used to it and I actually started gaining weight. It made me form a bit of a binge eating habit. I’m currently doing Warrior style dieting, but on days where I feel like I have a lot to deal with I don’t exaggerate either the under eating or overeating phases (in other words some days I eat SLIGHTLY more during the undereating phase (like for example two boiled eggs, a carrot and a fruit as my food for the undereating phase) and then eat slightly less during the “over eating” phase. So far so good on the Warrior diet (or atleast my loose version of it). Early days yet but I’ve already lost about 3 kgs in less than a week.

    1. you didn’t gain weight b/c your body got used to it.

      Like you said, you formed a binging habit, THAT’s why you ganined weight.

  4. I unknowingly practiced IF back in college. Would work for a cafeteria, and had very little money, so I’d pack a ton of food (probably 2500 to 3000 calories) onto my plate for my one free meal everyday at lunch or dinner. Never ate breakfast, and if I ate another meal during the day it wasn’t very heavy at all. I’d I’d kept working out, I probably would have had more muscle mass, but I went from 145lbs all the way down to 115lbs (I’m 155lbs now and just a smidge doughy). I had a ton of energy, but I would have gotten more out of it I’d I had been more knowledgeable and worked out. Walking about 10 miles a day wore me down a little too in the weight department. I’ll definitely try a more systematic approach and see how what works best, probably more fun when it’s not out of necessity.

  5. Hi Keith,

    So I have been doing basically 16/8 fasting for 3 weeks now. I have just been eating around maintenance and it’s been awesome. I can basically eat huge meals of anything I want and I don’t gain weight! I love it. However on January 5th (after all the holidays) my plan is to continue maintenance calories with the 16/8 fasting on 4 days per week, then the other 3 non consecutive day I will eat about 25 % of maintenance at 1 meal. So like 600 calories. What do you think? not to extreme? just lifting weight 3 days per week.

  6. I am 14 years old and abit over weight but, 5’7 180-178
    I am starting to eat breakfast at usually 6:30 am and lunch at 12:50 – 1 pm in the afternoon.

    I am still in school so i eat the school lunch (They serve healthy food that always has brown rice or another choice) and after that i don’t eat anymore and repeat the next day So basically i fast for 17 hours. Is that ok?

    Also i get home from school at 3:20 and drink green tea before i workout at the gym at 4:15pm till 5:30. And after i’m done working out, I drink another green tea at 6:00 or coffee with no sugar at 6:00 pm.

    I am losing a fair amount of weight by doing this but hopefully i don’t lose my puny gains. I also have strength in my body aswell! 😀

    Any suggestions? Please reply! I really appreciate you reading this!

      1. I barely fast trust me. I do it three times a week or 4 + im a guy lol
        I mean to say im 15* btw sorry typos!

        But bascially im 15 yrs old 178 and 5’7, I really wanna burn fat and get some small gains at first, My meals are basically mostly protein and small carbs from the brown rice i eat!

        Any tips?

        Does it affect my stomach in any way?

  7. I’m on IF(skipping b-fast) for a month now and lost 22 lbs. I feel great, full of energy. I can finally do some of my gymnastic routines I wasn’t able to do with my pork belly. 20 lbs to go!

  8. Great information! I came across your page to get more details on IF because I am looking to incorporate this way of eating into my life style. I wasn’t going to leave a comment but I just wanted to thank you for being responsible when it comes to the children seeking your advice. You could easily encourage them to follow us adults but instead you say “no, don’t do it” – not something most adults have the courage to say to our teens these days! They are still growing and this way of eating can be dangerous for them. Thank you!

      1. Hey Keith,

        I have a lot of kids asking me about things like this as well. I’m honest with them about what I’m doing, but don’t want them to do it (For the same reasons you’ve stated).

        Is there an post about this? I know there could be a LOT of problems with writing a post for kids. But is there one that is written for the adult that wants to help an over weight kid lose some weight? Like what a parent can do if their child is asking them about this. I don’t want to just tell them, “don’t do it”. I am looking for a good plan that will not stop their growth.

        Thanks!!

        1. Yes you have no idea how many 13-15 year old kids email and comment asking me if they can do this. It’s crazy.

          You should write one, I don’t think anyone has yet, but the same goes for any diet.

  9. Hey Keith. I’ve been reading a lot of your articles about superhero workouts and eating to loose weight and what not. I have a few questions, but first want to give you a little background. Last year, I completed my Spartan Trifecta. Being the fitness guru you are, I’m sure you know what this is, but just incase… It’s an obstacle course race that has 5 different distances. When you complete their 3+, 8+, and 12+ mile courses, you are awarded the trifecta medal. It was quite the accomplishment for me since I weigh 270 pounds. And even though I have a lot of fat on my body, I also have a lot of muscle and I attribute that to a lot of my high weight numbers. I still want to compete in these races because they force me to train for them, however I also want to drop my weight at least 50 lbs. (that pesky rope climb is a bitch when you weigh as much as I do no matter how strong you are). To be able to train, I still have to run long distances. Would the IF diets you list allow me to safely do this? Should I diet first then train? Will running help me loose weight as well, or will I just get better at running? I appreciate these articles you write and have them all bookmarked. Thank you for putting this information out there for people like me to read.

    1. How do you know you have a lot of muscle? You can’t have a lot of muscle simply because yuo have a high bodyweight. You should diet and train at the same time. I don’t advocate running on my site, I don’t believe it’s optimal for weight loss. You should be lifting weights and using something like IF to create a calorie deficit. But you can do the Spartan trifecta for fun.

      1. I guess you’re right. I don’t KNOW that I have a lot of muscle. I do know that I’ve seen guys who weigh 220 and are complete flabs of dough and can’t curl more than 20 lbs. I weigh 275, but I can flip 400 lb. tires, curl 100 lbs, bench 200 lbs. You get the point. I am an avid gym goer so I know I’m not all fat. It’s just a large layer on top of the muscle I already have. And I know you don’t advocate running on your site. I’m not asking about it for weight loss. It’s vital to my training to be able to run long distances. Should I be able to keep up the training while doing an IF life change?

  10. I have had success losing weight using the Stanley Burroughs Master Cleanse of Type B Maple Syrup and Lemons for up to 2 weeks. While having that I miss the pleasure of food (I love to eat!) I am not hungry when doing this.

    What I want to try is to do this Mon, Tue, Wed and Thur each week (so that will be about 400 calories each day) and then eat normally on Friday, Saturday and Sunday. This would be a net calorie reduction of maybe 8000 less calories per week, and allow me to eat yummy food three full days every week.

    I haven’t seen this strategy discussed, but it seems similar to the intermittent fasting idea. I too have read that starvation diets can cause metabolism to slow down and warnings about reduction only being muscle mass or water weight and not fat. If after 4 days o 400 calories my metabolism slowed down so that all calories on Friday Sat and Sun were not burned off then it could be counter productive.

    I am giving it a try now, but do you have any opinion or suggestions on what might be a needed tweek to this strategy? I like the lemonaide rather than nothing because I am not hungry when doing and as I said I have lost a lot of weight when doing it for 2 full weeks. I just think that 2 full weeks is too long for a long term strategy. Thanks!

      1. Thank you! Okay, how about 2 days, or 3 days and eating normally 4 or 5 days? I can bump the calories on the liquid days to 600 calories by having 4 cups of beef broth soup with spinach, mushrooms and onions for dinner. Is it too extreme because of the hours in a row with low calories or too extreme based on the number of days per week?

  11. Hi keith,
    during the holidays I went on an eating spree and gained like 5 kilos in the last month .so should I gradually decrease my calorie intake or just drop the intake sudden?

  12. One of my instructors from nursing school fasted every other day. So she had a day she would eat, then a day she would not. She had medical reasons for doing this, the biggest reason was to regulate blood sugar.

    Being a night shift worker, metabolism issues come with the territory, and fasting seemed like a good way to manage that. My instructor’s every other day fasting didn’t seem doable; I need my brain, and I don’t function well at 20 hours of no food.

    So I’ve been doing daily 12 hour fasts from midnight to noon, and not only has it helped regulate my metabolism and appetite, but it has helped my overall mood and functioning. I have no set wake/eat/sleep schedule, so having that one constant (midnight to noon fasting), has really helped me establish a daily rhythm. (Plus, when I’m sleeping during the day, that 12 hour fast often becomes 16 or 17 hours with no extra effort on my part.)

    I’m eating less, exercising more, and losing weight!

  13. I started IM about 2 weeks ago after reading a lot of material on line. It seems doable and logical to me. I know I should be incorporating weights/workouts too, but I really suck at exercise. I’m not really overweight, but want to slim down my belly and fit into the clothes I’ve recently outgrown. My plan is to eat during a window of 6-8 hours each day on weekdays (low calories, all veggies/fruit/protein with minimal carbs), then splurge a but on weekends. I typically drink a glass or 2 of beer or wine after work and I’m stopping that too. So far, I’m drinking more water during fast times and find I’m sleeping better. When I do eat, I feel fuller faster with less food.

    Can IM help me lose 20 lbs by May? This is my goal weight. I do hope to incorporate more exercise as I begin to see results and get inspired. I’m new to all this, totally driven and open to advice/feedback. This girl needs all the help she can get!

  14. Need urgent help.. a friend of mine is considering full fasting for 6 days a week to lose weight… I know its dangerous but will it actually make her lose any weight at all?

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