If you’ve ever wondered why some people seem to burn calories faster than others, the answer lies in one word: metabolism. Your metabolism is the collection of processes that convert food into energy. It’s what keeps you alive—powering your brain, muscles, and every organ in between. When you understand how your metabolism works, you can start influencing it in ways that help you feel better, manage your weight, and reach your health goals more efficiently. The Basics of Metabolism At its core, your metabolism is the rate at which your body burns energy, also called energy expenditure. This includes your Basal Metabolic Rate (BMR)—the calories you burn at rest—and your Total Daily Energy Expenditure (TDEE), which includes activity like walking, working, and exercise. Your BMR accounts for about 60–75% of your total calorie burn, so even when you’re not moving, your body is working hard to keep you alive. Several factors influence how fast your metabolism runs, including age, gender, lean body mass, genetics, hormones, and overall lifestyle. Lean Muscle Mass and Metabolism The biggest controllable factor in boosting metabolism is skeletal muscle. Muscle tissue burns more calories than adipose tissue (body fat), even at rest. That means increasing your lean body mass through strength training or resistance exercise can naturally raise your resting metabolic rate. You don’t have to live in the gym to see results. A few consistent sessions per week focused on compound lifts or bodyweight exercises are enough to stimulate muscle growth and improve your energy burn throughout the day. Exercise and Energy Expenditure Physical activity contributes significantly to your TDEE. Both aerobic exercise (like running, cycling, or swimming) and anaerobic exercise (like sprinting or lifting weights) increase calorie burn during and after your workout. A phenomenon called specific dynamic action (or the thermic effect of activity) means that after intense exercise, your body continues to burn calories at a higher rate as it recovers—a process often called the “afterburn effect.” Nutrition and Hormones What you eat matters just as much as how much you move. Protein has the highest thermic effect of food, meaning your body uses more energy to digest and absorb it compared to carbohydrates or fats. This small boost adds up over time. A balanced diet rich in protein, complex carbohydrates, and healthy fats supports hormone regulation and prevents the metabolic slowdown that can happen with extreme calorie restriction or starvation diets. Lifestyle and Recovery Sleep, stress, and hydration also play key roles. Chronic stress increases cortisol, a hormone that can lead to fat storage and a slower metabolism. Lack of sleep impacts leptin and ghrelin, hormones that regulate appetite, often leading to overeating. Prioritising rest and managing stress helps your body maintain a stable energy balance and keeps your metabolism running efficiently. The Takeaway Boosting your metabolism isn’t about quick fixes or miracle supplements—it’s about creating a consistent routine that supports your body’s natural energy systems. Focus on building muscle, staying active, eating enough protein, and sleeping well. Over time, these habits will naturally increase your metabolic rate and help you maintain a healthy body composition.