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A calorie deficit is the key to losing weight. When you burn more calories than you consume, your body starts using stored fat reserves to cover its energy needs. But how do you reach this deficit in a healthy and sustainable way? In this blog post you'll learn everything you need to know to get into a calorie deficit successfully and safely.
Before we start, let me briefly introduce myself: my name is Marco Laterza, I'm a personal trainer from Zurich. I offer my clients support in sport, nutrition and mindset. A holistic approach to health and fitness matters to me, and it's a concept I want to pass on to everyone. If you're interested in working together, feel free to get in touch anytime.
What is a calorie deficit?
A calorie deficit occurs when the amount of calories you consume is lower than the amount of calories you burn. Calories are a unit of energy that our body gets from food. When you burn more calories than you consume, your body starts breaking down stored fat to cover the missing energy.
Example:
- Calorie intake: 2000 kcal per day
- Calorie expenditure: 2500 kcal per day
- Deficit: 500 kcal per day
A daily deficit of 500 calories leads, long term, to a weight loss of roughly 0.5 kg per week.
Determine your calorie needs
Before you can aim for a calorie deficit, you need to know how many calories your body needs each day. This is called your Total Daily Energy Expenditure (TDEE), and it's made up of your Basal Metabolic Rate (BMR) plus your activity expenditure.
Basal Metabolic Rate (BMR)
Your basal metabolic rate is the amount of energy your body needs at rest to maintain basic functions like breathing, blood circulation and cell repair.
There are various formulas for calculating BMR; a common one is the Harris-Benedict formula:
- Men: BMR = 88.36 + (13.4 x weight in kg) + (4.8 x height in cm) - (5.7 x age in years)
- Women: BMR = 447.6 + (9.2 x weight in kg) + (3.1 x height in cm) - (4.3 x age in years)
Activity expenditure
Your activity expenditure depends on your daily activity. This includes sport, work, housework and any other form of movement. Activity expenditure is calculated using an activity factor (PAL value):
- Sedentary, little movement: PAL 1.2–1.5
- Moderately active (e.g. office work + light activity): PAL 1.6–1.8
- Active (e.g. physical work, intense sport): PAL 1.9–2.4
Total Daily Energy Expenditure (TDEE) = BMR x PAL value
How big should your calorie deficit be?
To lose weight sustainably and healthily, it's recommended to aim for a moderate calorie deficit. A deficit of 500 to 1000 calories per day typically leads to a weight loss of 0.5 to 1 kg per week.
Careful: Too large a deficit can lead to muscle loss, nutrient deficiencies and a slowed metabolism. It's important to find the right balance and not rush your weight loss.
Reducing calorie intake: tips for calorie-conscious eating
Count calories
The simplest method for reaching a calorie deficit is counting the calories you consume. Use apps or online tools to get an overview of your daily calorie intake.
Prioritise nutrient-dense foods
Fill your meal plan with foods that are rich in nutrients but low in calories. These include:
- Vegetables and fruit: Low in calories and rich in vitamins, minerals and fibre.
- Lean protein: Chicken breast, fish, tofu and legumes keep you full and support muscle maintenance.
- Whole grain products: Rich in fibre, which keeps you full for longer.
Avoiding liquid calories
Drinks like soda, fruit juice and alcoholic beverages can be a hidden calorie trap. Go for water, unsweetened tea or black coffee instead.
Control your portion sizes
Even healthy foods can lead to a calorie surplus if portions are too large. Pay attention to how much you eat and use smaller plates to reduce your portion size.
Increasing calorie expenditure: tips for boosting your activity
Alongside reducing your calorie intake, it helps to increase your calorie expenditure through movement.
Regular exercise
- Strength training: Builds muscle mass and increases your basal metabolic rate, since muscle burns more energy than fat tissue.
- Endurance training: Burns calories and improves cardiovascular health. Activities like running, cycling or swimming are especially effective.
Increasing everyday activity
Small changes in everyday life can also lead to higher calorie expenditure:
- Stairs instead of the lift: Every movement counts.
- Walk or cycle to work: Combine movement with your daily routine.
- Stand more instead of sitting: Increase your energy expenditure by reducing sitting time.
NEAT (Non-Exercise Activity Thermogenesis)
NEAT refers to the calories you burn through everyday activities that don't explicitly count as exercise, such as walking, cleaning or gardening. Try to build these activities into your daily life to increase your overall energy expenditure.
Monitoring and adjusting your progress
If you really want to lose a lot of weight, you need to prepare for a long journey. A training plan or a nutrition plan alone isn't enough. To make sure you're constantly making progress, keep the following aspects in mind:
- Weigh yourself regularly to check your progress. Once a week at the same time, ideally in the morning right after getting up, gives you a consistent picture.
- Sometimes the scale doesn't show your full success. Body measurements and progress photos can help you notice changes that come from building muscle and losing fat.
- If your weight loss stalls, consider whether you can increase your calorie deficit by slightly reducing your calorie intake or increasing your activity. However, make sure you continue to eat a balanced diet and have enough energy for your everyday life.
My conclusion on the calorie deficit
Reaching and maintaining a calorie deficit takes planning, discipline and patience. It's a long-term process based on sustainable habits and a healthy lifestyle. Avoid crash diets and extreme calorie restriction to secure long-term success and protect your health.
Stay motivated, monitor your progress and be ready to make adjustments. With the right strategy and a positive mindset, you'll reach your goals and maintain a healthy weight.