What is a Carb-Cycling Diet? (And is it Right For You?)

What is a carb-cycling diet?Diet

In the most simplest terms, a carb-cycling diet typically involves alternating between high-carb eating days and low-carb eating days.

Now, my regular readers will know that I’m not particularly a fan of the word “diet”.

In my mind it conjures up images of restricting certain foods (or even entire food groups) for a set period of time in order to lose weight.

With that said, by following a “diet” strictly and to the letter you will actually lose weight.

Sounds great, right?

Whoa, hold your horses, if only it was that simple.

However, once a diet is over most people return to their “normal” way of eating and start piling the pounds back on (and often even more weight than before because of the impact that some diets have on our metabolism).

Nevertheless, carb cycling is something that I personally regularly adhere to.



I don’t follow a particularly strict protocol you understand, but I appreciate how carb cycling can be ideal for weight maintenance and indeed, weight loss.

So, I’d like to delve a little deeper into carb-cycling diets.

What is a Carb-Cycling Diet?

A Quick Word on Carbs

I think before I get into the nitty-gritty of carb cycling I just want to say that carbs aren’t the enemy, and they never have been.

We went through a period a few decades back when fats were considered to be the devil incarnate, but in the current millennium it seems that carbs are now evil, satanic offerings that should be avoided at all costs.

During the 1980s and 1990s everything was low-fat this and low-fat that, but now we have realised that only certain types of fats are bad for us, whereas others are actually very good for our health.

Atkins made an appearance towards the end of the last century before we started eating like our cavemen ancestors and Paleo became all the rage.Keto Diet

And as we go full-steam ahead and enter the third decade of the new millennium (it’s gone really quickly, hasn’t it?) Keto is all that anyone has been talking about for the last 5 years.

Basically, many of us are currently severely restricting carbs and even cutting them out completely.

I will say that eating too many carbs can contribute to you storing body fat and putting on weight.

However, carbs are required to fuel both the body and the brain.

We just don’t seem to focus on eating the right types of carbs, such as whole grains, plus certain fruits and vegetables.

No, we are far more attracted to the sugary and starchy carbs that taste so delicious, and we feel as though we simply can’t live without them.

Then once the pounds start piling on we immediately blame the entire food group, “carbs are bad”, without realising that it’s simply our choice of carbs that is at fault.

This is why for people who are looking to maintain their current weight, or lose weight and body fat, carb cycling may just be the happy medium.

Carb Cycling Explained

There are literally so many carb-cycling systems and diets out there it’s enough to make your head spin.

I guess it’s most commonly associated with serious athletes, especially bodybuilders.

Bodybuilders will typically know day-to-day exactly when they’re going to workout and how long for.

So, they will follow a weekly carb-cycling program.

This may involve eating a high number of carbs one day followed by two or three days of extremely low-carb eating.

They will specifically count the number of grams of carbs they are consuming each day based on their muscle mass, weight, activity levels and overall goals.

However, for us mere mortals, a great way to approach carb cycling is on a daily basis over a longer period of time.

So, let’s say that you workout really hard for 4 days a week.

This may involve heavy weight-lifting, high-intensity intervals, circuits, sprint workouts, etc.

On these particular days your body burns through carbs and fat for energy.

This means that your stores of protein are left alone and can be used for their actual purpose, building and powering your muscles.

So, for your workout days, or higher-intensity exercise days, it’s a good idea to get more of your calories from carbs.

You require more energy on these days, and your body will automatically use these “additional” carbs for energy.

However, on the days that you are either inactive, or you exercise at a lower intensity, e.g. yoga class, long walk, jogging (NO, LOL, I’m not a fan), then it may make sense to lower your carb intake.

CHECK THIS OUT====>Is Jogging Good For Losing Weight?

You see by eating the exact same number of carbs on your “inactive” days your body may store glucose from the additional carbs in your fat cells.

By consuming fewer carbs on these days your body will automatically use fat for energy, and this is how you either maintain your current weight or lose weight (depending on your overall calorie intake).

Carb Cycling and Your Weight

A simplified way to look at this would be:

  • To Lose Weight – Eat fewer carbs on your inactive days, but maintain the same amount of protein and fat.
  • To Maintain Weight – Eat fewer carbs on your inactive days, but eat more protein and vegetables (if you swap carbs for additional protein and vegetables on “rest” days it’s actually really hard to overeat – don’t believe me, try eating double the amount of chicken and broccoli compared to normal, it’s pretty much impossible).
  • To Gain Weight – Eat slightly fewer carbs on your inactive days, but eat more protein, vegetables, and “good” fats.

You’ll note that for putting on weight I’ve mentioned to “slightly” cut carbs on rest days.

The idea behind weight loss or weight gain is not to make wholesale changes, but to aim for small increments every week.

So, if you’re trying to lose weight, you may decide to cut your carbs in half on inactive days – so rather than a full bowl of A bowl of riceporridge, you’ll eat half.

Rather than a full portion of rice or pasta, you’ll eat half a portion.

And rather than eating a whole jacket potato, you eat half.


You could argue that if someone is looking to gain weight then they should just stick to eating the same macronutrient split (carbs, protein, fats) every day, regardless of whether they are exercising or not.

However, let’s not forget that eating too many carbs may lead to weight gain by storing fat.

The aim of putting on weight will be to do so in a healthy manner, which is best achieved by eating sensibly and looking to increase lean muscle mass (as opposed to fat).

What’s the Difference Between Carb Cycling and Keto?

The Ketogenic diet has some very specific rules about what you can eat and how much of it.

The basic idea of keto is to reduce carbs and increase fat so that the body is “fuelled” by ketones, as opposed to glucose (basically the body will use fat to burn for energy, which is why the diet requires you to dramatically increase your intake of fat).

However, the various forms of Keto will require you to eat less than 30-50g of carbs most days.

This is generally why people experience “keto-flu” for the first week after starting a ketogenic diet.

As the body tries to adjust to fewer carbs you may feel headaches, fatigue, irritability, difficulty sleeping, constipation, etc.

Just to confuse matters somewhat there is also a process known as Keto cycling, which allows for additional carbs on certain days.

But, that’s for discussion in another article entirely.

The way in which carb cycling differs to Keto is that even on your low-carb days you will still be eating a lot more carbs than on a Ketogenic diet.

For a basic rule of thumb you could say that on your “exercise days” you should be eating 2g of carbs per pound of bodyweight, and on your inactive days, you eat half this amount.

So, for a person weighing 170lb they would consume 340g of carbs on active days and 170g of carbs on inactive days.

As you can clearly see both days offer far more carbs than the restrictive 50g (or below) with Keto.

My “Rules” for Carb-Cycling

Firstly, I have to say that even though I follow a type of carb-cycling method, I’m not overly restrictive and I have learned to be flexible.

In fact, on inactive days it could be something as simple as losing the banana and honey from my morning oats, as well as having about three-quarters of the amount I usually would.

I won’t eat the two tangerines I like to enjoy mid-morning, and my evening meal will have about three-quarters of the carbs it Oats with peanut butternormally would.

In total, just these small changes account for about 125g in carbs.

However, being that I’d like to maintain my weight, I have a slight increase in protein, fat, and vegetables.

This could be as easy as “sweetening” my morning oats with an extra tablespoon (or two if I’m honest) of peanut butter, replacing the tangerines with a handful of nuts and seeds, and piling on the veg (and stealing extra portions of chicken, fish, etc. from someone else’s plate).

That’s it.

So, as you can see, pretty much everything stays the same, and I certainly don’t feel as though I’m restricting myself in any way (which is typically how most people feel when they’re on a “diet”).

You should also be aware that both protein and carbs have 4 calories per gram, whereas fat has 9 calories per gram.

Therefore, if I didn’t have the additional protein, fat, and vegetables on my rest days, the loss of 125g of carbs would equate to 500 calories.

Is losing weight without “dieting” every single day of your life becoming a little clearer now?

The “Rules” of a Carb-Cycling Diet

For those of you who are looking to lose weight via carb cycling it will require a little more planning, and you may even wish to weigh, measure, and count the actual grams that you’re consuming.

This does delve into the realms of being “restrictive” as far as I’m concerned, but with most carb-cycling diets, measuring is a requirement.

Firstly, you’ll need to know how many calories you need on a daily basis.

This is based around a number of factors, e.g. height, weight, age, activity levels, etc.

You can check out my article, How Many Calories Does the Average Person Burn in a Day?

You will find various calorie-calculators (I’ve included one just below), which will work out how many calories you are burning while at rest, as well as how many calories you are burning a day based on your levels of activity.

Once you know how many calories you are currently burning a day you simply need to consume fewer calories than this in order to lose weight.

I would suggest that a good starting point is to consume 300-500 calories less a day than you’re burning, and you’ll lose weight steadily, but healthily.

As for how you should split your macronutrients, once again many carb-cycling diets will require exact amounts, but I’ll make it a little easier for you.

In general, in order to maintain your weight, you can aim to eat 2g of carbs per pound of body weight, 1g of protein per pound of body weight, and make the rest up with healthy fats.

Calories, Carb Cycling & Weight Loss

Here’s an example using all the information above.

A man aged 25, 5ft 10, 170lbs, works in a moderately physical job, and performs heavy weight training regularly.

Using this calculator we know that his Basal Metabolic Rate (calories burned while at rest) is 1,833 calories.

However, based on his activity levels he would need to consume 3,116 calories a day in order to maintain his weight of 170lbs.

His macronutrient split would be:

340g of carbs (his weight x 2) x 4 (4 calories per gram of carbs) = 1,360 calories

170g of protein (his weight x 1) x 4 (4 calories per gram of protein) = 680 calories

A total of 2,040 calories.

The rest of his calories should be made up in healthy fats, i.e. 3,116 – 2,040 = 1,076 calories

1,076 / 9 (9 calories per gram of fat) = 120g of fat

This is the number of calories and macronutrient split that this man would require to maintain his weight.

This is also a very healthy macronutrient split of calories working out to 54% carbs, 27% protein, 19% fats.

In order to lose weight we will reduce this man’s calorie intake by 500 calories a day to 2,616 calories.

We will do this by decreasing 50g in carbs (200 calories), 15g in protein (60 calories), and approximately 27g in protein (243 calories), so 503 calories in total.

So, his new daily totals will be:

  • 290g carbs
  • 155g protein
  • 93g fat

This will still provide him with enough energy to live his active lifestyle, while building lean muscle, and losing weight.

On the days when he isn’t as active (not performing heavy weight training) he can “cycle” his carbs.

I would suggest cutting just 100g in carbs, thus reducing his calorie intake by a further 400 calories, so he is consuming 2,216 calories on his rest days.

This is a very rudimentary way to look at carb cycling and weight loss, but hopefully you understand it a little better now.

I would also say that if you are looking to follow a specific carb-cycling diet it is important to know these calculations, as it will typically be a requirement to follow these for yourself.

Is carb cycling right for you?

I guess this very much depends on the type of person you are and what you’re looking to achieve.

I definitely think there is a benefit to carb cycling in terms of simply consuming fewer carbs on the days when you are less active.

This is what I do and it works for me.

I don’t take any specific measurements, but through experience I have learned what is right for me.

Initially, this did take some working out, as I found there were days when I lacked energy or felt hungry because I hadn’t consumed enough carbs on a low-carb day.

There also happened to be days when I felt stuffed and full because I had overdone the carbs on my inactive days.

It’s just a simple process of working out what’s right for you.

As for whether you should try a more strict carb cycling diet – well that depends on whether you want to be measuring, weighing, counting, and perhaps lacking flexibility in what and when you can eat.

What I will say for anyone who is carb-cycling is that you should keep your low-carb days to an absolute minimum of 130g (your brain and body will still be required to function).

Plus focus more on dropping sugar and refined carbs, such as bagels, muffins, etc, and ensure that you stick with eating the carbs that have plenty of fibre, e.g. oats, apples, broccoli, etc.

Tessa’s Open & Honest Views on Carb Cycling


Final Thoughts

Hopefully, you’re now aware of what a carb-cycling diet is and how they work.

You may even now have decided whether you’re for or against carb cycling.

As I’ve mentioned, carb cycling is definitely something that I do, but I am flexible in my approach.

Simply put, on the days when I am highly energetic I consume a higher amount of carbs.

And on the occasional day when my activity levels are much lower I eat a few fewer carbs.

What are your thoughts on carb cycling?

I’d love to hear from you, so drop me a line in the comments section below.

Thank you for reading.

6 thoughts on “What is a Carb-Cycling Diet? (And is it Right For You?)”

  1. As soon as there is math involved I zone out, I have noticed. Not because I don’t want to do any math, although I don’t know what it is then. So maybe I have to conclude that it’s exactly that: I don’t want to do the math. 🙂

    In reality I guess that my way of eating already is a cycling. Some days we eat meat and vegetables for lunch, other days we eat rice, pasta or potatoes and vegetables. Oh, and some days we only eat vegetables.

    Ever since I lost a lot of weight (as you know it took me 1,5 to 2 years) I am staying at my present 63 to 65 kg. I don’t know what that is in English sizes. And indeed by just eating less.

    But given your explanation about feeling energized or stuffed, I’ll take better notice of what I ate that day to see if there is a connection. So as usual your article inspired me! 🙂

    • Haha Hannie,

      I actually recall from a previous article of mine that you don’t particularly enjoy maths.

      I probably shouldn’t tell you that as well as having a passion for exercise and nutrition, I also have a Finance degree, and my main career was in Banking. So, I guess you could say that Maths is my thing.

      I see, you do some type of food cycling, but I guess it’s more for variety than anything else, which is good of course.

      For myself, I’m not as strict as many people may be with carb cycling, but I know if there’s certain days that I take as a rest day, or if I happen to exercise less because I’m busy, I’ll automatically lower my carbs that day.

      I don’t take exact measurements or anything like that, I’ll just eat a smaller portion, or not add certain ingredients, as I’ve mentioned in my article.

      But yes that is the main thing – as long as you’re feelling properly energised for the day and can undertake your daily activities without any issues, then you have certainly taken on eough carbs.

      As I say, I had to play around with this for a bit, as there were some days I felt stuffed, whereas others I was extremely lethargic. So, it’s all about finding a happy medium.

      Ah, thank you for your kind words Hannie, that’s very sweet of you to say, and you always inspire me too.

      I enjoy visiting your website and reading and commenting on your various articles, plus I always learn and take something from it.


  2. Partha,

    I was surprised to even see an article with Diet in the title on your site, but I’m glad you wrote this. I’ve been having difficulty following my prescribed “Modified Keto” plan for the past months due to stress and illness.

    Anyway, to the point of my comment. I have a complicated medical history that includes Diabetes, a Heart Attack, and a Migraine Disorder that sometimes results in Seizures. Medication is controlling as much of the seizures as it can, and it has nearly stopped the Seizures, but my blood sugars recently have been WAY too high. The tress eating and illness haven’t helped of course, and I need to get back to the plan the nutritionist laid out for me.

    My prescribed diet includes 50-70 grams of carbs and a higher fruit and veggie allowance. The carb allowance changes based on blood glucose tests.

    My question is could I use Carb Cycling with a Modified Keto style diet, or should I avoid trying Carb Cycling?

    • Hi Sean,

      Good to hear from you.

      Firstly, I know you’re obviously not after sympathy, but I am extremely sorry to hear about your various conditions and illnesses.

      I have watched some of my loved ones suffer from many of the conditions you have mentioned here, and although you never actually know how someone else feels, you can certainly share their pain and difficulties.

      In a way you are already “cycling” as such because your carb intake will vary based on your blood glucose tests. As I’ve touched upon in the article, there is also a system known as “Keto-cycling”, which involves introducing a higher amount of carbs on different days, but this would still only increase intake by by 50-60g on those days.

      I would obviously advise you to speak to your medical practitioner and nutritionist before making any changes to your diet, but I will say that your nutrition plays a huge role in controlling many of your current conditions. Plus eating in a certain way could also help to even correct some illnesses.

      I note that you’ve mentioned that you have a “higher fruit and veggie allowance”. Are these fruits and vegetables that incorporate additional carbs?

      The reason I ask is because your prescribed carbs are still very low, even for a “modified Keto diet”, so I guessing that your healthcare providers believe that carbs need to be kept to an absolute minimum for your blood sugar levels. A carb intake of 130g or below would usually be considered on the low side, and many diabetics are “allowed” carb levels above this.

      So, just looking at your current carb intake, and when you talk of “higher fruits and veggies”, I’m wondering what types you are eating?

      For example, just adding one orange, one kiwi fruit, one portion of carrots, one portion of sweetcorn, and one portion of beetroot, will typically add another 70-80g of carbs to your daily allowance.

      I guess with everything going on with your health Sean it can sometimes feel a little soul-destroying to try to stick with a certain diet, but I feel you need to get back on track.

      As I say, speak to your doctor/nutrionist about the potential for carb-cycling, but I believe as your current carb intake is so low, plus the issues you’re having with your blood sugar levels, this isn’t something for you.

      Please do let me know what advice you are given by your healthcare professionals Sean, I’d be really interested to hear what they have to say.

      Take care and thanks for stopping by again.


  3. Partha,

    Thanks for the response!

    I have certain veggies that don’t “cost” against my carb count, the rule for veggies is everything except carrots since I see a spike in my sugars after them. I also am supposed to limit peas, but not as much. Other veggies are free and I don’t need to worry about counting the carbs too carefully. The same with fruits, oranges and tangerines, bananas, grapes, and watermelon are on the list to avoid there, so are a few others. Some high sugar fruits like berries and cherries are ok for me. I get those and apples free.

    The goal is to avoid lows, so I’m supposed to go to fruit first. We always have tangerines, bananas and grapes on hand in case I feel a low coming. They are safer than Orange Juice since they don’t result in a fast spike which can sometimes trigger a seizure.

    I’ll be setting an appointment with the doctor and nutritionist in January. I’ll come back and let you know what they say.

    Thanks for the response,

    • Hi Sean,

      Wow, well it certainly seems like you know exactly what you can and cannot have.

      Totally agree about carrots, as they are high in sugars anyway, so they will definitely cause a spike.

      Actually, I’m understanding the choice of fruit a lot more now. Even though many of the fruits you have mentioned would be considered “high-carb”, as you say they are slow-release, as opposed to something like juice, which typically means that they shouldn’t cause a spike in your blood sugar levels.

      I’m really pleased to hear that you’re setting up appointments for the new year, and please do let me know how you get on, I’ll be really interested in any other advice or recommendations you are offered. It’s also a good learning process for me.



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