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.

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.

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

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

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:
- Intermittent Feast By Nate Miyaki
- Fast 5
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.
Dear Keith, love your articles! I’ve been doing IF for the most part for a year and a half and the best thing about it is the positive affect it’s had on my immune system and energy level. I didn’t exercise or really cut any calories and I didn’t follow a specific plan I would just fast some days 20 hours and some days less and a few days 16 hours but calorie intake was high from alcohol during week endsl. I’m 5 foot 3, weigh 145 pounds, 42 years old and I really want to be at my normal weight of around 120. So…I’ve been doing IF the past 3 days fasting for 18 to 20 hours a day and reduced my calories to 900 and on weekends I am planning to fast at least 14 hours but not reduce calories because I know I will be eating more and drinking…usually vodka soda or bubbly with nothing else added…will I still be able to lose weight? I read on Dr. Sara Soloman site that on days when you increase your calories they shouldn’t be consecutive days but for me the weekends are when I increase my calories do to social activities….would appreciate your advice. In addition, I’m planning to start exercising and once I do then I will increase my calories on fasting days as well….your advice is highly appreciated.
if you don’t reduce cals, you won’t lose weight.
Would fasting for three days straight be pushing it?
yes
Hi what about alcohol and IF?
read this – https://www.fitmole.org/workout-90-minutes-a-week-eat-cookies-and-get-wasted-the-rebel-guide-to-getting-a-summer-beach-body/
i lost 8 lbs after 2 months then i started to cheat and now i gained 8 lbs wtf back to 176……grrrrrr
how much did you cheat?
I used to fast a lot but I’ve been going through a lot with family loss and what not. Now I’m 60lbs overweight. What do you think would be the best one for me?
Sorry about the loss, but what does that have to do with your ability to use IF?
I fell off the wagon i guess and got really lazy. I want to change that and I really want to do the warrior diet. When it comes to fasting I am determined and take it very seriously. I usually take C-4 and I want to know if I have to workout on an empty stomach like the other fast. Or can I take my pre workout while I’m fasting and workout?
you can take preworkout, that’s fine.
I really want to try the leangains IF method to lose weight but is it really necessary to lift weights inorder to retain muscle mass since I’m young and don’t really want to lift right now?
yes, you will lose muscle if you don’t lift. How young are you? If you are under 18, you shouldn’t be fasting.
Hi, I was just wondering would I lose much if i fasted 16-24 hours a day and ate only 700-800 calories a day without exercising. Im 5″ 8′ and i weigh 11 and a half stone (161 pounds) and I seriously need to lose weight, at least a stone, would i be able to lose that much from fasting? Thanks for your help
that’s way too few calories. I recommend at least 1700 calories per day right now for you.
Okay, thank you for the help
do i have to continue IF forever, will i be able to stop for awhile like 2 or 3 days or a week then restart it, the question is must IF be continuos.
and also i read somewhere that we need to calculate net fasting, meaning if we fast for 16hrs, then its only 10 hrs we are fasting, the 5 0r 6hrs are glycogen usage before we enter the fasted state, meaning less fasting time
don’t worry about net fasting.
Hey Keith,
I started basically the warrior diet on monday. I’ve got a hard deadline of june to hit my goal.
I did the math for my calorie deficit I need to hit it within the time frame. I just wanted to ask about another article that relates to this.
You say you can go on 800 calories a day for 7 days, but you didn’t recommend going any longer than that, is that purely for physcological reasons, or is there something physiological about that?
(supposing I set it up to hit my macros and supplement with micros)
As for the 24 hour fast a day, I personally think it’s amazing. Trying to eat several times a day causes really bad hunger pains when I’m restricting calories.
I really don’t feel hungry when I fast and every meal tastes great.
I just make it lunch, so when I start to crave food at night I just go to sleep.
Because I don’t have much money, ever since I got to Uni I have been fasting during the day, and just eating at night when I got back home (sometimes in the mornings too). I did it only to save money I did’t know this was a method, yet all these years I have kept myself between 110 and 115 pounds being 5’2, I thought I was just naturally slim, until recently while living abroad I gained 33 pounds in 3 months! Now I’m back home &I went back to my old routine, and have a calorie intake of 1000 calories a day. Is it enough to lose weight? How much time will it take to lose 33 pounds? Is it bad if half of my calorie intake is beer? (well not always, but some people like chocolate, I like beer) Thanks!
Realistically, prob around 3-4 months.
I have lost almost 200 lbs and still have more to go and the hardest thing to fight has been my metabolism. I have done IF a few different ways. If I workout in the morning I always do it fasted. And other times I do the 16 hour fast and workout at end of fast. But then rest of day I was taking in 800-1000 Calories. I was making great progress then hit a wall. Had to switch to eating every few hours. My metabolism is so slow and I don’t know what else I can do. I like fasting and I like having control over my food because a big issue of mine has been food addiction. I will binge, so taking control by fasting is wonderful and I like the feeling. I workout six days a week heavy and lift and do endurance training. Any advice on type of fasting or calorie intake after I’m done fasting. I definitely don’t like going to bed on an empty stomach. And when I don’t feel hungry I find that’s a week where I won’t loose a lot and it’s a sign of a slow metabolism. Help? I’m still 175 and 5’4. Mind you I have about 20 lbs of skin and I’m 22% fat left.
800-1000 is way too little at your weight, that will absolutely cause metabolic damage. I recommend taking a week eating in a slight surplus.
Hi, I’m 5’7 weigh 470 lbs and am a 34 year old female. I just happened to stumble across your article. I’m want to lose 300 lbs total. After reading your article I am thinking of doing 800 calories a day, Fasting every day for 16 hrs 7 days a week…. I’m very interested in knowing your opinion and would greatly appreciate any helpful input. Thanks
470 puts you in the morbidly obese category. I would consult a doctor before anything.
Hello,
Im currently 250 lbs and 5’11 and a female i have lost 50lbs and would like to lose 50 more i have never used IF before but am very interested. Im in the gym at least an hour a day 6 days a week. Which IF do you think i should try first?
Honestly, doesn’t matter.
IF is not a quick fix. Seems like you need to make some major lifestyle changes before anything else. So start by improving your overall diet and just try to eat healthier first.
hey, I’ve tried this in the past with just brisk walk, I fasted for 24hours once a week and I would eat every 14- 18hours everyday but I consume a lot of water and it help with my weight loss . but I didn’t change my diet..
now im back on that same method but this time I will use a lot of fruits. and push in brisk walking when I can
i weigh 85kgs (187 pounds)….i have been fasting for 23 hours daily for two months….i havent weighed myself yet, but i can see that my stomach is improving. i eat 1 meal a day and i dont count the calories. i dont drink and i rarely eat dessert. how much weigh do you presume i will lose….my target is to be 70 kgs. (i also do exercise)
if you aren’t tracking calories, I have no idea.
If you aren’t tracking, you’re just firing blind.
Hi there, I’m a little confused with the IF process in terms of how many calories should be consumed after fasting. I’ve read that after fasting, you can eat what you’d like without counting calories because your body will be in fat burning mode. However, I’ve also read that even after your fasting, you must still make sure to eat at below maintenance calories in order to lose weight. Can you help clarify this?
no not true at all.
You simply have a more calories to eat in a smaller window so you feel fuller overall. But it isn’t a “free for all” once the fast is over.
Hi,
I need to lose 15lbs in 2 months. I dont workout but I would like to know which method would work best?
Thanks!
lifting weights. Something like a 3 day full body split is good.