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A simple first step in understanding how calories work and how they influence weight loss. This guide breaks down what calories are, how to calculate your calorie needs, and how to set a safe and sustainable calorie target for weight loss.
How many calories should you eat to lose weight? With so many diet plans and nutrition tips out there, it can be hard to know where to begin. A simple first step is understanding how calories work and how they influence weight loss.
This guide breaks down what calories are, how to calculate your calorie needs, and how to set a safe and sustainable calorie target for weight loss.
Quick summary:
- A calorie deficit of around 300--500 kcal per day is a safe, sustainable starting point for most people.
- BMR is the energy your body needs at rest; TDEE is your total daily energy burn, including movement and exercise.
- Your calorie needs depend on your age, sex, weight, height and activity levels, and they change as you lose weight.
- Nutrient-dense foods (protein, veg, wholegrains, healthy fats) help you feel fuller and energised on fewer calories.
- Extreme calorie restriction can stall progress and affect well-being. Always prioritise fuel, recovery and balance.
Is An Understanding of Calories Essential For Weight Loss?
Here at PureGym we're keen to support you in your health and fitness journey. If weight loss is part of your goals, we believe it's best to approach this in a gradual and sustainable way, combining healthy diet changes and exercise to keep your body in tip-top shape.
Very low calorie plans might promise fast results, but lasting change usually comes from healthier habits: modest calorie reductions, nutrient-dense foods, and routines you can stick to without compromising your physical or mental well-being.
Calorie tracking can be a useful tool for understanding your intake, but it isn't right for everyone. If you have concerns about your weight or eating habits, speak with a GP, dietician, or nutritionist who can help you find an approach that suits your needs.
Once a famous person said You are what you eat!
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What Are Calories?
Calories are a measure of the energy that food and drink provide to our bodies. This provides the vital fuel we need to function, from our brain to our biceps. Food is made up of macronutrients known as protein, carbohydrates and fats, which all play a different role within your body. They all have different energy values, which influence how many calories of energy we get when we consume them.
How Do Calories Affect Weight Loss?
If we regularly consume more calories than we burn, our body will store those additional calories as fat. A repeated excess of around 500+ calories over your daily burn number is likely to lead to gradual weight gain. Likewise, cutting your calories to around 500 calories below your daily burn amount is likely to lead to a healthy and steady amount of weight loss.
However, do bear in mind, these numbers are a guideline figure only and will differ depending on your current build, health and genetic make-up.
The first step in determining how many calories you may want to aim towards for weight loss is understanding your BMR and TDEE - read on to find out more.
What is Basal Metabolic Rate (BMR)?
Even without including workouts or additional exercise, your body will burn a certain number of calories just by carrying out its basic functions, such as thinking, breathing, digesting or pumping blood around your body. This is known as your Basal Metabolic Rate or BMR.
BMR varies person-to-person depending on your age, gender, height and weight.It can even be affected by your genetics, medications and environmental factors like temperature.
The quickest and easiest way to discover this number is to use an online BMR calculator, but the number is still an approximation, not an exact measurement.
What is Total Daily Energy Expenditure (TDEE)?
Your Total Daily Energy Expenditure (TDEE) is the total amount of energy you burn in a day. It includes:
- BMR - calories your body needs at rest
- Physical activity - intentional exercise like walking, running or strength training
- NEAT (Non-Exercise Activity Thermogenesis) - everyday movement such as standing, fidgeting, housework or commuting
- TEF (Thermic Effect of Food) - a small number of calories burned through digestion
Many people estimate their TDEE using online calculators or fitness trackers. Trackers can help you spot patterns but aren't perfectly accurate - they often overestimate calorie burn, sometimes by a few hundred calories. Treat the numbers as guidelines, not precise targets.
Understanding your TDEE can help you find a calorie range that supports your goals, whether that's maintenance, muscle gain or weight loss.
Learn more about NEAT and how to maximise its benefits with our guide.
How Many Calories Should You Eat to Lose Weight?
Your daily calorie needs depend on your age, sex, weight, height, and activity levels. To lose weight safely and sustainably, the NHS recommends creating a moderate calorie deficit rather than following very low calorie diets, which can be unsafe for most people.
Daily calorie needs for men
Most adult men need more calories than women due to higher average muscle mass and basal metabolic rate. The NHS uses 2,500 kcal per day as a general guideline for maintenance, but individual needs vary.
Maintenance calorie ranges for men:
- Sedentary (little structured exercise): approx 2,200-2,600 kcal
- Moderately active (3--4 workouts per week): approx 2,400-2,900 kcal
- Active (intense exercise 5--7 days per week): approx 2,800-3,200+ kcal
Weight loss calorie ranges for men:
A typical sustainable deficit is 300--500 kcal per day. For many men, that means:
- Sedentary: approx 1,700-2,100 kcal
- Moderately active: approx 1,900-2,400 kcal
- Active: ~2,300-2,700 kcal
Daily calorie needs for women
The NHS uses 2,000 kcal per day as a general maintenance estimate for women, although individual needs vary with muscle mass, height, and activity levels.
Maintenance calorie ranges for women:
- Sedentary: around 1,700-2,000 kcal
- Moderately active: around 1,900-2,200 kcal
- Active: around 2,100-2,500+ kcal
Weight loss calorie ranges for women:
- Sedentary: between 1,200-1,600 kcal
- Moderately active: between 1,400-1,800 kcal
- Active: between 1,600-2,000 kcal
The lower end shouldn't be taken further without medical supervision.
How To Calculate A Safe Calorie Deficit
A calorie deficit means eating slightly fewer calories than your body uses each day. The aim is to create enough of a reduction to support steady fat loss, while still giving your body the fuel it needs to feel energised and stay healthy.
1. Start with your maintenance calories
Begin by working out roughly how many calories you need to maintain your current weight. You can use an online calculator or compare your stats to typical activity-level calorie ranges.
2. Aim for a moderate reduction
Most people do well with a 300--500 kcal daily deficit. This level of reduction is generally considered safe and supports gradual, sustainable progress.
A moderate deficit helps:
- Support a steady rate of fat loss
- Protect muscle mass
- Reduce hunger and fatigue
- Make healthy eating habits easier to maintain
The NHS has guidance about this on their calorie counting page.
3. Avoid going too low
Cutting calories too aggressively can leave you low on energy, increase the risk of nutrient gaps, and make your plan harder to stick to. Very low calorie diets (typically under 800 kcal per day) should only be followed with medical supervision.
4. Consider your activity levels
If you train regularly, you may need a slightly smaller deficit to stay well-fuelled for workouts. If you're less active, a standard 300--500 kcal reduction is usually a good starting point.
5. Review as your body changes
Calorie needs naturally shift as you lose weight. Checking in with your progress, hunger levels, and energy every few weeks can help ensure your deficit remains appropriate.
How Calorie Deficits Work For Different Body Types
A calorie deficit affects everyone in slightly different ways. Factors like sex, muscle mass, and body composition influence how many calories you burn each day, and therefore how quickly you may lose weight.
Gender differences in calorie burn
On average, men tend to burn more calories than women at rest, as shown by studies like this in the National Library of Medicine. This is largely due to a generally higher proportion of lean muscle tissue, which uses more energy than fat. As a result, typical maintenance calories are often higher for men, and they may be able to sustain a slightly larger calorie deficit without feeling too fatigued.
These differences are averages rather than rules. Body size, age, lifestyle, and fitness level all play a part, regardless of gender.
Impact of muscle mass and body composition
Muscle tissue is metabolically active, meaning it requires more energy to maintain than body fat. The more lean muscle you have, the higher your resting metabolic rate (RMR), and the more calories your body burns even when you're not exercising.
This is one reason strength training is helpful during weight loss - building or maintaining muscle can support a higher daily energy expenditure, making it easier to maintain a moderate deficit.