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In order to be a calorie deficit, you need to;

  1. Estimate your maintenance calories
  2. Based on that, set a daily/weekly calorie target
  3. Stick to that target consistently 
  4. Monitor weight, activity and calories consistently so you know when/if you need to reduce your calorie target to lose more weight


A calorie deficit is a state where you’re taking in fewer calories than you burn, over a given period of time.

So, if on a given day you burned 3000 calories, but only ate 2000 calories, you’d be a calorie deficit of 1000 calories. The bigger deficit you’re in, and the longer you maintain that deficit, the more weight you’ll lose.

When we say ‘burn’, we don’t just mean through ‘formal’ exercise (e.g. running/cycling), we mean your total TDEE (Total Energy Expenditure), which is made up of several factors.

These factors are;

  • Your RMR (Resting Metabolic rate) i.e. how many calories you’d burn if you just layed down all day N.B. this is also known as BMR (Basal Metabolic Rate)
  • Your Formal Exercise, i.e. how many calories you burn through formal exercise like lifting weights or running
  • NEAT (Non-Exercise Activity Thermogenesis) – how many calories you burn through stuff like walking around, fidgeting, or doing the housework
  • TEF (Thermic Effect of Food) – how many calories you burn through the digestion of food. Some food takes more calories to digest than others, for example, protein requires more effort to digest than fat

The sum of these four aspects will determine the total amount of calories you burn each day

metabolism (NEAT, BMR, etc)


If you burn more calories than you eat over a given period of time, you will lose weight.

Let’s use the above example.

If you burned 3,000 calories, but only fed your body 2,000, the energy for that other 1,000 has to come from somewhere – of course, the desire for most people will be that this 1,000 calories will come from bodyfat, and the likelihood is that most of it will, but some may come from muscle.

What does a 1,000 calorie deficit in a day actually mean for weight loss?

Well, if you were in a 1000 calorie deficit everyday, it would take 3.5 days to burn 1lb of fat (or 7.7 days to burn 1kg of fat). This is because 1lb of fat contains 3,500 calories (1kg of fat contains 7,700 calories).

If you want to lose more weight, you simply increase the size of the calorie deficit.

Let’s say you wanted to lose 10lbs (4.5kg) of body fat. That means creating a calorie deficit of 35,000.

If you wanted to do that over a 3 month period that would mean an average daily calorie deficit of 389 calories.

If you currently maintain your weight on 2,000 calories, that would mean that you need to eat an average of 1,611 calories per day for 3 months.

Simple maths.

Except we’re talking about the biochemistry of the human body, psychology and behaviour so it’s not always quite that simple…



But calories in do affect calories outso although you might assume you’re in a deficit of 389 calories per day (using the example above), you may not be.

When you drop your calories, your activity levels will subconsciously drop – this is because your body notices a decrease in energy intake, and so will dop energy expenditure to compensate. This may be small stuff like fidgeting, stretching or walking around the house, but it all adds up over time.

Let’s take a look at an example of how energy intake can affect energy output.

We’ll use a completely made up person – this is Anne, 42 from London. Anne maintains her weight on 2000 calories, and decides to start dieting on week 4.

Average Daily Energy Intake (calories)Average Daily Energy Output (calories)Size of Deficit
Week 1200020000
Week 2200020000
Week 3200020000
Week 4 (start of diet)18002000-200
Week 518002000-200
Week 616002000-400
Week 716002000-400
Week 816001900-300
Week 916001900-300
Week 1016001800-200
Week 1116001800-200
Week 1216001700-100

In this example, you can see that Anne reduces her calorie intake to 1800 calories at the start of her diet, creating a 200 calorie deficit, in week 6, she reduces it by a further 200 calories, creating an even bigger deficit (400 calories).

But there’s a plot twist, in week 8, her average daily energy output falls by 100 calories, meaning the size of the deficit is reduced.

A deficit still exists, so weight loss will still happen, but it’s smaller than before, so the weight loss will happen a slower rate.

The graph below represent this in a more visual way – the yellow line (size of the deficit) reduces as the energy output reduces (red line) BECAUSE energy intake has been reduced (blue line).

All of this means that weight loss isn’t necessarily a linear, predictable process because there are so many moving parts.

You can do all of the calculations in the world, but your body may not respond to a certain amount of calories the way you suspect.

Does this mean that trying to calculate a calorie deficit is pointless?

Absolutely not – but it does mean that you can’t just set a target, stick to it and expect a consistent level of weight loss, you need to continually track and monitor your progress so you know when to adjust your calorie intake based on your rate of weight loss.

Anyone can do this themselves with a bit of hard work and patience, but hiring a weight loss coach will make the process a lot easier.


So now we’re armed with the knowledge of what a calorie deficit actually is and how it works, how can we go about actually creating a calorie deficit?

The first step is to calculate our maintenance calories, otherwise known as our TDEE or total daily energy expenditure.

There are many different ways to do this and while some people may claim that one is the most accurate, none of them can be 100%, so be aware whatever method you use will be an estimate.

If you want a free e-book guide for calculating maintenance calories, stick your email below and I’ll send you one.


Once you’ve got your maintenance calories (remember this is an ESTIMATE), you can then go and set a calorie target target for yourself.

This should be based on two things;

  1. How Much Weight You Want to Lose
  1. How Quickly you want to lose it

Let’s say you want to lose 10lbs (4.5kg). You then need to establish how quickly you want to lose it

As we established above, 10lbs of weight requires a 35,000 calorie deficit (in theory), so the sooner you want to lose it, the more aggressive your diet would need to be.

Let’s also assume our maintenance calories are 2000 per day.

Here’s how many calories you’d need to eat per day on average to lose 10lbs across different timeframes

TimeframeRequired Daily Calorie Intake
1 month333
2 months1417
3 months1611
4 months1708
5 months1767
6 months1806

Clearly, as the timeframe increases, the severity of the required deficit reduces.

Which timeframe should you pick? It depends how aggressive you’re prepared to go with calories, and what your willpower is like.

I certainly wouldn’t recommend that ANYONE try to lose 10lbs in a month; sticking to 333 calories everyday simply won’t be sustainable.

The more calories you give yourself, the easier it’ll be to stick to, so I’d recommend trying to strike a balance between speed and sustainability – sustainability will always trump speed however.


Well, if you can’t stick to your target calories,  you likely won’t end up losing any weight. Better to take things slow and get the result rather than rush, and give up because it’s too difficult.

If you’d rather just use a calculator to work out what your deficit should be, try this one;



You don’t HAVE to count calories to to be a deficit. But regardless of whether you do count calories, calories still count.

The reason that counting calories is a great idea is that it gives you more certainty that you are in a deficit, meaning you’re safe in the knowledge that you’re leaving no stone unturned.

On the other hand, you may simply HATE the thought of tracking everything you eat and drink (it’s really not that difficult), so if you want to lose weight, but calorie counting is something you categorically DON’T want to do, then you don’t have to.


Of course, the beauty of counting calories that you can pretty much be in the mindset that you can eat whatever you like, within reason, so long as you’re hitting your calorie calorie goal.

If you DON’T count calories, you need to put a lot more rules and structure in place to make it as likely as possible that you’re going to be in a deficit.

These rules might be;

  1. Prioritise Low Calorie Dense, High Volume Foods

These are foods that weigh a lot (so they’ll fill you up), but contain relatively low calories (so it’s more likely you’ll be in a deficit. These include vegetables (how did you guess?), fruit, lean proteins (chicken, turkey, white fish, lean red meats) and low fat diary (cottage cheese, milk, yogurt).

2. Intermittent Fast

Intermittent fasting is just a fancy way to say ‘skip a meal’. Most intermittent fasting protocols dictate that you eat in a 16:8 pattern, this means only eating within an 8-hour window.

For most people, the most convenient time to do this is between 12 midday and 8 pm; this is essentially the same thing as skipping breakfast and means that if you usually have 500 calories at breakfast, you be having 500 calories fewer per day.

Of course, the trick is to ensure that you don’t get so hungry that you eat an additional 500 calories later in the day!

3. Walk More

In my opinion walking is the best form of exercise if weight loss is the goal.


Because it’s easy to do consistently.

Yes HIIT burns more calories in the same time frame, but how many times per week are you going to be motivated to do it? And for how long for, a few weeks? A few months? You can walk pretty much everyday for the rest of your life!

How many you should do daly to lose weight depends on how much you’re eating, but I’d start by doing a consistent number each week, then you can adjust from there if you’re not losing weight at the rate you want.

4. Eat More Protein

Protein is kind of magic.

It helps build and maintain muscle (trust me, you want more muscle).

It helps keep you fuller than foods that are predominantly carbohydrate or fat.

Best of all, you actually burn more calories digesting protein than you do digesting carbs or fat. This means that the higher proportion of your diet is made up of protein, the fewer calories you’ll store as fat.

5. Avoid High Calorie Dense Foods

This is basically the opposite of point #1.

Avoid foods that contain a lot of calories for very little weight. Examples of these types of foods are Butter, oils, peanut butter, nuts, Nutella and full fat dairy like cheese and cream (or anything cream or oil-based like Mayonnaise for example).

Foods like this will take up very little room on your stomach (so they won’t fill you up) but contain a LOT of calories.


So, should you count calories or not?

Often the answer isn’t clear cut, so lets’ look at the pros and cons;


  • You can eat in an ‘IIFYM’ style, i.e. eat pretty much whatever you want, as long as it fits with your calories
  • It’s very liberating; you don’t have to worry anymore about certain foods being ‘bad’ or ‘good’, each food has a calorie value and that’s that
  • You’ll educate yourself about calories, so at some point you’ll be able to eat intuitively, knowing the rough calorie content of most popular foods as you can just manage your weight ‘on the fly’


  • When you start out, it can be time consuming to learn how to use My Fitness Pal
  • It can detract you from eating nutrient dense foods; if you’re just hitting a target, and you can do that with low nutrient density foods like cakes, candy, cereal chips and crisps then you probably will
  • It can lead to obsessive behaviours that disrupt your lifestyle e.g. skipping social events because you’ve already hit your calorie target for that day


There’s no right answer to this question, it really depends on the individual.

If you have a hard target for your weight loss (e.g. a wedding or holiday) then you’re kind of backed into a corner.

If there’s no hard target, you can take this a bit slower (although you should still set an end date).

How long you give yourself will depend on how hard you can diet.

If you’re a busy professional that’s always on their feet and out for lunches, dinners and drinks then an aggressive calorie deficit may simply be too difficult to stick to.

If you work from home and have a relatively consistent daily schedule, it’ll probably be a lot easier.

This ultimately comes down to you.

What I wouldn’t advise is setting an arbitrary figure. A 500 calorie deficit is a number that seems to be thrown around quite a bit and while it’s a nice round number, it won’t suit everyone.

Let’s say you’re a small female weighing 50kg and you currently eat and maintain your weight on 1500 calories per day, 500 is a huge and very noticeable chunk to cut out (33%) of your calories.On the other hand, if you’re an active 90kg male you might maintain your weight on 4000 calories per day, in which case, 500 isn’t a huge amount to take out (12.5% of daily calories).

Use the methods described above if you have a clear amount of weight you want to lose in a predetermined time frame. If not, make sure the size of your calorie deficit is proportionate to your current maintenance calories.

Overall, I’d recommend a deficit of no more than 500 calories per day. This amounts to 3,500 calories per week and would technically result in a loss of approximately 1kg per week. Most of my clients are relatively comfortable at this level of weight loss. Some people can handle dropping weight at a faster rate, but the faster you go, the more difficult it’s going to be, and the less likely you are to adhere to it.


As a general rule, I wouldn’t recommend a larger deficit than 1000 per day. This would mean a 7000 calorie deficit per week which is roughly equal to 1kg of weight loss. Many of my clients have been able to maintain this for several weeks but the more you lose, the more difficult it gets to lose more. A more manageable deficit is around 500 per week which equates to roughly 0.5kg per week.

The degree of the calorie deficit any one person can handle however is highly dependant on the person and their lifestyle. Those with a busy life may find a large calorie deficit difficult to maintain for a long period of time. Others that have very little else to focus on may find it easier.

If your rate of weight loss does slow down, this isn’t because you’ve gone to ‘starvation mode’ – this is a myth. What is actually happening is metabolic adaptation; your new lighter body requires fewer calories to keep itself alive than before, and therefore fewer calories to lose more weight.

If you do hit a plateau, the best thing to do is take a diet break so you’re at maintenance calories for a week or so. This will allow your satiety hormone (leptin) to return to normal, and stabilise your metabolic rate somewhat, it also provides a psychological break, allowing you to go all-in again.


The short answer is yes, you can.

The caveat is, if you eat in an IIFYM style, (i.e. filling up your calorie target with donuts, cakes, chocolate and candy), you’re probably not going to feel great, especially if you train at the gym or play sport.

You’re probably also not going to be that helathy because you won’t be getting a wide enough range of votamins and monerals.

For most people, the best approach is a balanced one, with a diet consisting of 75% low-calorie dense foods (food that contains a lot of volume or weight, for relatively few calories) and 25% higher calorie-dense foods (or what people might call ‘junk’).

The higher calorie-dense food IS important though, we ALL like high fat, high sugar foods, so allowing yourself some of this will help keep you on track.


As you can see above, the math around creating a calorie deficit is quite simple, the difficult part is creating that calorie deficit in a sustainable way, i.e. in a way that fits into your lifestyle and you can maintain for a long time.

There are many well-known diets out there that help you create a calorie deficit and lose weight. The problem is, most of these diets are NOT sustainable.

Let’s look a couple of examples;

Weight Watchers

Weight Watchers is a dieting ‘club’ in the UK with an in-person community aspect and ‘leaders’ that will conduct weekly weigh-in sessions. This is highly motivating for many, and I personally know lots of people that have lost weight during their membership.

But what happens when you stop your membership? Weight Watchers assign ‘syn’ values to food that are essentially made up (as opposed to just focusing on calories, which are real). You don’t know how to eat in a way that maintains your weight, so you’ll most likely put it all back on.


This is a method of dieting which bans pretty much all carbs.

And guess what? It works for a lot of people.


Because carbs make up a large part of most people’s daily calories (fruit, bread, rice, pasta etc), if you get rid of them, you eliminate a lot of calories so you’ll lose weight.

But this is because of the CALORIE reduction rather than the CARB reduction. If you reduced fat or protein you’d see similar results.

So what happens when you stop doing Keto? You regain all of the weight you lost because you don’t know how to maintain your weight while eating carbs.

And let’s be realistic, NO ONE is going to stop eating carbs for the rest of their life.

So, how can you create a calorie deficit, that will help you lose and MAINTAIN your weight in a sustainable (i.e. you can do it forever) way?

Weekly rather than daily calorie targets

Having a calorie target will give you something to aim for, but daily targets can be quite restrictive – if you go over your calories one day you might feel like you’ve screwed up your diet and give up.

This is why weekly targets are much easier to stick to. Look at the two examples below, which looks more like a ‘normal’ lifestyle;

Daily Targets:


Weekly Targets:


Both examples have a total of 14,000 calories taken in throughout the week, but the person with weekly targets has much more flexibility, which allows them to up their intake on Saturday to account for a takeaway and drinks (for example).

Food Volume

Just eating ‘what you want’ while sticking to a prescribed amount of calories sounds great – and it can be as long as you ensure you’re eating a way that will make you feel full and energised enough to go about your life.

While you theoretically CAN lose weight just eating chocolate and cake and cheese, I wouldn’t recommend it.


Those foods won’t fill you up, and if you’re hungry all the time, you’re going to feel like trash.

You’re far better off prioritising low calorie dense foods – i.e. food that weighs a significant amount, but doesn’t contain a lot of calories, this means it’ll take up room in your gut and make you feel full and satisfied.

Great examples of these foods are vegetables, fruits, beans/legumes, yogurts and lean meats like chicken, turkey, certain cuts of pork and white fish. Here’s a list of some low calorie dense foods (the nearer the top of the list, the lower the calorie density).

Prioritise Protein

Protein is the most important macronutrient in your diet.

This is because it helps to maintain and/or build muscle, helps you feel fuller, has a high thermic effect (it takes more calories to digest) and it contains (depending on the source) many other beneficial micronutrients.

You should look to base each of your meals around a protein source. E.g.

Breakfast – Eggs or Yogurt

Lunch – Deli meats like sliced turkey or ham

Dinner – Chicken, Steak, Pork, Salmon, White Fish etc

Snacks – Jerky, Protein Bars, Boiled Eggs, Milk

Aim to get at least 1.5g of protein per kg of bodyweight. This means that if you weigh 80kg, you should aim for a minimum of 120g of protein per day


You’ll never be able to calculate exactly how many calories you should be eating for weight loss, but you do at least need something to aim for.

Once you have that, you can track your calories, activity and weight everyday. This will tell you if the amount of calories you’re eating is low enough to produce weight loss, or whether you need to lower it some more.

Remember to eat in a way that means you’ll feel full and satisfied, while leaving room for the odd treat here and there.

It’s simple, but not easy.

Joe is an online weight loss coach and qualified personal trainer of 15 years who helps busy, professional men and women lose fat and build muscle.

Having a 9-5 desk-job, Joe understands the struggles of juggling a hectic life with trying to maintain a good physique.

If you want to know more, check out the about page, or get in touch

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