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What is Basal Metabolism?

Basal metabolism is the minimum amount of energy a human body expends when it is at complete rest, meaning it is performing no physical activity, its digestive system is not working, and it is only sustaining life support functions.
In other words, it is the calories your body consumes to breathe, pump blood, renew cells, maintain body temperature, and sustain brain functions, even if you lie completely still in bed doing nothing all day.

Key Details About Basal Metabolism

Here are the key details you need to know about basal metabolism:
1. Largest Part of Daily Energy: Approximately 60% to 75% of our Total Daily Energy Expenditure (TDEE) is consumed by basal metabolism. This means that even if you don’t move, your organs consume the most energy to function.
2. BMR (Basal Metabolic Rate): In scientific literature, basal metabolic rate is referred to by its English initials, BMR.

Factors Affecting Basal Metabolism

Factors affecting basal metabolism:
1. Genetics and Age: As age advances (typically after the 30s), the basal metabolic rate slows down due to a natural decrease in muscle mass.
2. Gender: Since men generally have higher muscle mass than women, their basal metabolic rates are also higher on average.
3. Body Composition: Muscle tissue burns significantly more calories than fat tissue, even at rest. Therefore, individuals with a higher muscle ratio have a faster basal metabolism.
4. Body Surface and Size: As body weight and surface area increase, the amount of energy required to sustain the body also increases.
5. Hormones: Especially the under- or over-activity of the thyroid glands (thyroxine hormone) directly and seriously affects basal metabolism.

How to Speed Up a Slow Basal Metabolism?

It is not possible to directly “double” your basal metabolic rate overnight with a magic pill; because this rate largely depends on genetic structure, height, age, and gender. However, there are several scientifically proven effective ways to permanently increase the amount of calories the body expends at rest and “ignite” metabolism:

1. Increase Muscle Mass (The Most Effective Way)

   • While fat tissue expends very little energy at rest, muscle tissue is metabolically extremely active and burns significant calories even when stationary.
   • Regular resistance training (weightlifting or bodyweight calisthenics) directly increases your basal metabolic rate by increasing your muscle mass.
   • The stronger your muscles, the more calories your body consumes at rest.

2. Pay Attention to Protein Intake (Thermic Effect of Food)

   • Our body expends energy even to digest, absorb, and metabolize the foods we eat. This is called the Thermic Effect of Food (TEF).
   • While carbohydrates and fats require less energy for digestion, the body burns much more calories for protein digestion (approximately 20-30% of the protein calories you consume are expended during digestion).
   • Furthermore, protein is vital for maintaining and developing muscle mass.

3. Increase Daily Activity (NEAT)

   • Beyond basal metabolism, movements we make unconsciously throughout the day (standing, walking, climbing stairs, fidgeting) are called NEAT (Non-Exercise Activity Thermogenesis).
   • A sedentary lifestyle slows down metabolism. Being more active during the day directly increases your total calorie expenditure.

4. Drink Enough Water

   • All chemical reactions in the body (including metabolic processes) occur in a water environment. Research shows that drinking cold water, in particular, can temporarily speed up metabolism to balance body temperature. Dehydration can slow down metabolic processes.

5. Quality and Sufficient Sleep

   • Lack of sleep increases stress hormones (cortisol) in the body and negatively affects appetite control hormones (ghrelin and leptin). Long-term poor sleep quality or deficiency disrupts the body’s energy balance and has a metabolism-slowing effect.

6. Avoid Crash Diets

   • Suddenly drastically reducing daily calorie intake (extremely low-calorie crash diets) triggers the body’s survival mechanism. The body, perceiving a “famine period,” intentionally slows down energy expenditure (basal metabolism) and starts burning muscle tissue. Therefore, sustainable and adequate nutrition is essential.