I’m going to decipher the truth about the whole slow metabolism thing! Does it make you gain weight?
Does your metabolism slow down as you get older?
What’s the truth about metabolism? Is a slow metabolism a myth or is it true?
Is metabolism really to blame?
Can you speed up your metabolism to burn more calories?
These questions are very common, so I decided to answer them based on science for you.
Is it true that metabolism is linked to weight?
Yes! But contrary to common belief, a slow metabolism is rarely the cause of excessive weight gain.
While your metabolism influences your body’s basic energy needs, how much you eat and drink along with the amount of physical activity you do are the things that determine your weight.

Metabolism: Converting Food into Energy
Metabolism is the process by which your body converts what you eat and drink into energy. During this complex process, calories from food and beverages are combined with oxygen to release the energy your body needs to function.
Even when you’re at rest, your body needs energy for all its functions, such as breathing, blood circulation, hormone level adjustments, and cell growth and repair.
The number of calories your body uses to perform these basic functions is known as your basal metabolic rate – what you might call metabolism. Several factors determine your individual basal metabolism, including:
- Your size and body composition: People who are larger or have more muscle burn more calories even at rest;
- Your sex: Men generally have less body fat and more muscle than women of the same age and weight, which means men burn more calories;
- Your age: As you age, the amount of muscle tends to decrease and fat accounts for more weight, reducing calorie burning.
The energy needs for your body’s basic functions remain fairly consistent and are not easily changed.
In addition to your basal metabolic rate, two other factors determine how many calories your body burns per day.

Burning Calories Beyond Metabolism!
- Food processing (thermogenesis): Digesting, absorbing, transporting, and storing the food you consume also consumes calories. About 10% of the calories from carbohydrates and proteins you eat are used during the digestion and absorption of food and nutrients.Scientists call the activity you do throughout the day that isn’t deliberate exercise “non-exercise activity thermogenesis.”This activity includes walking from room to room, activities like gardening, and even fidgeting. Thermogenesis is responsible for about 100 to 800 calories used daily.
- Physical activity and exercise – such as playing tennis, walking to the store, chasing after a dog, and any other movement – account for the rest of the calories your body burns each day. Physical activity is by far the most variable of the factors determining how many calories you burn per day.
Exercise is even better, as it’s systematic, with duration, volume, and intensity!

Metabolism and Weight
It might be tempting to blame your metabolism for weight gain. But since metabolism is a natural process, your body has many mechanisms that regulate it to meet your individual needs.
Only in rare cases do you experience excessive weight gain due to a medical issue that slows down metabolism, such as Cushing’s syndrome or an underactive thyroid gland (hypothyroidism).
Unfortunately, weight gain is a complicated process. It’s likely a combination of:
- Genetic composition;
- Hormonal controls;
- Diet composition; and
- Environmental impact on your lifestyle.
Including sleep, physical activity, and stress.
All these factors result in an energy imbalance. You gain weight when you eat more calories than you burn – or burn fewer calories than you eat.
While it’s true that some people seem to be able to lose weight more quickly and easily than others, everyone loses weight when they burn more calories than they consume.
To lose weight, you need to create an energy deficit by eating fewer calories or increasing the number of calories you burn through physical activity, or both.
Supplements aren’t miraculous, but with well-guided workouts and a simple diet, they can be the icing on the cake.
Now, I’ll repeat. Don’t forget the foundation:
Consume fewer calories than you burn, and you’ll lose weight. It’s that simple.
American guidelines recommend cutting calories by 500 to 700 calories per day to lose 0.5 to 0.7 kg per week.
If you have questions about carbohydrate, protein, and fat intake, send me a message, and I can analyze it for you through my coaching in training and nutrition.
You’ll receive a plan tailored to your needs and goals.
If you want a guide to decreasing bloating and water retention, you should definitely check out my detox guide. I created the best strategy for you to follow for 10 days. Super easy and practical to make you lose up to 10 kilos!