Metabolism Explained: How Your Body Burns Calories

Metabolism is the process by which your body converts food into energy. Understanding how it works helps you make informed nutrition decisions.

What Is Metabolism?

Metabolism encompasses all chemical processes that maintain life. It includes:

• Basal Metabolic Rate (BMR): calories burned at rest
• Thermic Effect of Food (TEF): calories burned digesting food
• Activity Energy Expenditure (AEE): calories burned through movement

Basal Metabolic Rate (BMR)

BMR is the number of calories your body burns at rest. It depends on:

• Age (decreases with age)
• Sex (men typically have higher BMR)
• Body composition (muscle burns more calories)
• Genetics
• Hormones

Factors Affecting Metabolism

Age

Metabolism naturally slows with age, approximately 2-8% per decade after 30.

Muscle Mass

Muscle tissue burns more calories than fat tissue. Building muscle through strength training increases BMR.

Hormones

• Thyroid hormones regulate metabolism
• Cortisol affects fat storage
• Insulin influences energy utilization

Nutrition

• Adequate protein supports muscle maintenance
• Nutrient deficiencies can slow metabolism
• Regular eating patterns support metabolic health

Boosting Metabolism

• Build muscle through resistance training
• Eat adequate protein
• Stay hydrated
• Get sufficient sleep
• Manage stress levels
• Include regular physical activity

Metabolism and Weight Loss

Understanding metabolism helps set realistic weight loss expectations. A moderate deficit combined with lifestyle changes produces sustainable results.

Conclusion

Metabolism is complex and individual. Rather than trying to "boost" it dramatically, focus on sustainable habits that support overall health.