Calories: What They Are & Do You Need to Count Them?
Calories have acquired a slightly strange reputation.
Some people obsess over them.
Some people insist they don't matter.
Some people seem personally offended by their existence.
In reality, a calorie is simply a unit of energy.
Food and drink provide energy. Your body uses energy to keep you alive, move around, digest food, regulate temperature, exercise and generally go about your day.
Understanding that relationship can be incredibly useful—without necessarily counting every calorie you eat.
ENERGY BALANCE
Changes in body weight are governed by energy balance.
Put simply:
If you consistently consume more energy than you expend, your body weight tends to increase.
If you consistently consume less energy than you expend, your body weight tends to decrease.
If energy intake and expenditure are roughly matched over time, your body weight tends to remain relatively stable.
That's the basic principle.
But there's an important phrase in there:
Over time.
Your body isn't a spreadsheet that resets itself at midnight.
BODY WEIGHT DOESN'T MOVE PERFECTLY WITH CALORIES
You could be in a calorie deficit and weigh more tomorrow morning.
That doesn't mean energy balance has stopped working.
Your scale weight also includes:
Water
Glycogen
Food travelling through your digestive system
Waste
Body tissue
Training, carbohydrate intake, salt, hydration and numerous other factors can change these from one day to another.
So if fat loss or weight gain is your goal, look at the trend across weeks, rather than panicking about individual weigh-ins.
YOU DON'T NEED TO "BURN OFF" YOUR FOOD
One thing I'd avoid is thinking:
"I burned 400 calories training, so I can eat 400 calories."
Firstly, estimates of calories burned during exercise aren't perfectly accurate.
More importantly, exercise isn't simply a transaction where you exchange burpees for biscuits.
Your total daily energy expenditure includes much more than formal exercise.
There's the energy required simply to keep you alive, the energy involved in digesting food, your everyday movement and activity, and your training.
All of this contributes to your total expenditure.
Think about overall energy balance, rather than trying to match individual foods with individual workouts.
CALORIES AND FOOD QUALITY ARE DIFFERENT THINGS
If two diets provide the same amount of energy, they don't necessarily provide the same nutrition.
Calories tell us about energy.
They don't tell us everything about:
Protein
Fibre
Vitamins and minerals
Essential fatty acids
How filling a food is
How enjoyable it is
How convenient it is
How it affects your training
This is why both food quantity and food quality matter.
If you're trying to lose body fat, energy intake matters.
If you're trying to be healthy, strong and perform well, what that energy comes from matters too.
CALORIE DENSITY
Some foods contain considerably more calories for their size than others.
This is known as energy density.
Fat provides around 9 calories per gram, while carbohydrate and protein provide around 4 calories per gram. Water contributes volume without providing calories.
This is one reason foods containing lots of water and fibre—such as many fruits and vegetables—can provide a large volume of food for relatively few calories.
Compare 100 calories of chocolate with 100 calories of broccoli and you'll have dramatically different amounts of food in front of you.
That doesn't make chocolate bad.
It just means that if you're trying to eat fewer calories while managing hunger, food volume can be useful.
HIGH-CALORIE DOESN'T MEAN UNHEALTHY
This is worth making clear.
Nuts are calorie-dense.
Olive oil is calorie-dense.
Avocado is relatively calorie-dense.
None of them becomes a bad food because of that.
Likewise, processing doesn't automatically make a food high in calories or nutritionally poor.
The useful question isn't:
"Is this food fattening?"
It's:
"How does this food fit into my overall diet and goals?"
WHAT ABOUT "EMPTY CALORIES"?
I don't particularly like the term.
Alcohol, sugary drinks, sweets and similar foods can provide plenty of energy while contributing relatively little protein, fibre or micronutrition.
That's useful to understand.
But they aren't literally empty.
They contain calories, and sometimes enjoyment, convenience, cultural significance or a social role.
If fat loss is your goal, reducing calorie-containing drinks, alcohol or foods that provide lots of calories without making you particularly full can be an easy way to reduce your overall intake.
That doesn't necessarily mean eliminating them.
DO YOU NEED TO COUNT CALORIES?
No.
Calorie tracking is a tool, not a requirement.
I've successfully coached plenty of people who never weighed a gram of food.
For many people, our hand-portion method is enough.
You might start with something like:
1–2 palms of protein
1–2 fists of fruit or vegetables
1–2 cupped hands of carbohydrate
1–2 thumbs of fat
Then adjust those portions according to your goals, appetite, activity and progress.
It's deliberately approximate.
And sometimes approximate is all you need.
WHEN CALORIE TRACKING CAN BE USEFUL
Some people prefer numbers.
Tracking food can give you a much clearer picture of how much energy and protein you're actually consuming.
That can be particularly useful when:
Your progress has stalled.
You want greater precision.
You're learning about the calorie content of different foods.
You have a specific performance or body-composition goal.
Or you simply enjoy working with data.
You might weigh food and log it using an app, then work towards a calorie and macronutrient target.
This requires more effort, but provides more information.
CALORIE TRACKING ISN'T MORE DISCIPLINED
I would definitely change this part of the original.
Tracking calories doesn't make somebody more disciplined than someone using portions.
And not tracking doesn't mean someone lacks discipline.
They're simply different methods of managing the same underlying thing.
One person might love numbers and find tracking incredibly easy.
Another might become completely fed up with weighing peanut butter within three days.
If hand portions get you where you want to go, brilliant.
If calorie tracking makes the process easier, use it.
If you need more precision temporarily, track for a while and reassess.
Use the least complicated method that reliably produces the result you need.
CALORIE TARGETS ARE ESTIMATES
Even when we calculate someone's calorie requirements, we're still starting with an estimate.
Equations can give us a sensible starting point, but they don't know exactly how much you move, how your activity changes between days or how your body responds.
Food labels and tracking apps aren't perfectly precise either.
So don't treat a calculated target like an instruction handed down on a stone tablet.
Start somewhere sensible.
Follow it consistently.
Monitor what happens.
Then adjust.
FAT LOSS
To lose body fat, you need to maintain an energy deficit over time.
That doesn't mean:
Eat as little as possible.
A larger deficit isn't automatically better.
You still want enough food to support your health, training, recovery and ability to actually stick to the plan.
The goal isn't to discover how few calories you can survive on.
It's to find an intake that produces appropriate progress while allowing you to live and train reasonably well.
GAINING WEIGHT AND MUSCLE
If you want to gain weight, the principle works in the opposite direction.
You need enough energy to support an increase in body mass.
If the goal is specifically to build muscle, that should be combined with progressive resistance training and sufficient protein.
Eating an enormous calorie surplus doesn't automatically build muscle faster.
At some point you're simply gaining additional body fat.
Again:
More isn't automatically better.
IN CLOSING
Calories matter.
But that doesn't mean everybody needs to count them.
Energy balance determines whether body energy stores increase or decrease over time, while food quality, protein, fibre, training, activity, sleep and behaviour all influence how successfully you can achieve your goals.
You can manage your intake using calorie tracking.
You can manage it using portions.
You can sometimes manage it simply by changing a few consistent eating habits.
The underlying physiology doesn't change.
The best method is the simplest one that gives you enough control to get where you want to go.