Key takeaways
- Daily calorie burn comes from resting metabolism, digestion and physical activity.
- Resting metabolism makes up the largest share, around 60–70%.
- Research in Science shows metabolism stays stable from about age 20 to 60.
- More muscle, more daily movement, enough protein and good sleep help you burn more.
Understanding your metabolism starts with knowing where your daily calories go. Once you see the full picture, it becomes clear which parts you can change and which habits make the biggest impact.
Where Your Daily Calories Go
Your total daily energy expenditure is made up of three parts.
- Basal metabolic rate: the energy needed for breathing, circulation, brain activity and cell maintenance, roughly 60% to 70% of the total.
- Thermic effect of food: about 10% of calories are used to digest, absorb and store nutrients. Protein takes the most effort to process.
- Physical activity: both exercise and NEAT, the energy from everyday movement like walking, cleaning and standing. It's the most adjustable component.
Does Metabolism Really Slow Down With Age?
Much less than people think, at least before 60. In 2021, a research team led by Herman Pontzer published findings in Science from more than 6,400 participants across 29 countries. Their analysis showed that, after accounting for body size, metabolic rate is remarkably steady between ages 20 and 60. After 60, it declines by roughly 0.7% per year.
So why do many people gain weight in midlife? Usually because of gradual muscle loss, lower activity levels, more stress and less sleep. Each of these is something you can work on.
Muscle is active tissue that uses energy even at rest. Preserving muscle with strength training is one of the most reliable ways to support your metabolism long term.
Natural Ways to Support Your Metabolism
Build and keep muscle
Strength-train all major muscle groups at least twice a week, progressively increasing weight or repetitions.
Move more all day
Increase NEAT by walking more, standing up regularly and choosing active options whenever possible.
Eat enough protein
Protein supports muscle, keeps you full and increases the calories your body uses for digestion.
Prioritize sleep
Seven to nine hours of sleep supports hormone balance, recovery and the energy to move more.
Where Supplements Fit
Supplements can add support to a healthy routine. Green tea catechins and caffeine have been studied for supporting thermogenesis, and chromium helps the body use carbohydrates normally. Check with your doctor if you take medication or are caffeine-sensitive.
Want simple daily support to go with these habits?
Learn About ChocotideSources
- Pontzer et al., “Daily energy expenditure through the human life course,” Science, 2021.
- Mayo Clinic, “Metabolism and weight loss: How you burn calories.”
- Hursel et al., “The effects of green tea on weight loss and weight maintenance: a meta-analysis,” International Journal of Obesity, 2009.
- U.S. Department of Health and Human Services, Physical Activity Guidelines for Americans, 2nd edition.
This article is for general educational purposes and summarizes publicly available information. It is not medical advice and does not describe the effects of any specific product.