"I do not eat that much, but I still cannot lose weight." If this sounds familiar, your metabolism has probably come up in conversation — and someone may have suggested it is "slow". The reality is more nuanced. Your metabolic rate is partly genetic, but it is also significantly influenced by your lifestyle. That offers more room for change than most people realise.
Key takeaways
- Your basal metabolic rate (BMR) accounts for 60 to 75 percent of your total energy expenditure — and muscle mass is the biggest controllable factor.
- Protein has a thermic effect of 20 to 30 percent: your body burns calories just to digest it.
- Strength training raises your BMR by building muscle — which burns more calories than fat tissue, even at rest.
- HIIT training creates an afterburn effect (EPOC) that can persist for up to 48 hours post-workout.
- Poor sleep reduces insulin sensitivity and increases appetite — both of which work against your metabolism.
- There is no single fix: combining lifestyle factors produces the most consistent results.
What is your metabolism?
Your metabolism — or metabolic rate — is the sum of all chemical processes in your body that produce and use energy. It has three components:
- Basal metabolic rate (BMR): the energy you burn at complete rest — for breathing, heartbeat, cell maintenance. This accounts for 60 to 75 percent of total daily energy expenditure.
- Thermic effect of food (TEF): the energy burned digesting and processing food. Around 10 percent of total expenditure on average.
- Activity expenditure: everything above rest — exercise, walking, fidgeting, standing.
Your BMR is the largest component — and it is strongly influenced by your muscle mass.
12 evidence-based ways to support your metabolism
1. Eat more protein
Protein has the highest thermic effect of all macronutrients: 20 to 30 percent of its calories are used just in digestion. That means for every 100 calories from protein, only 70 to 80 are actually available. Carbohydrates score 5 to 10 percent; fats just 0 to 3 percent. Higher protein intake also increases satiety, which helps regulate total calorie intake.
2. Strength training
Muscle is metabolically more active than fat tissue — it burns more calories even at rest. Each kilogram of muscle is estimated to burn around 13 calories per day at rest, compared to around 4 calories for fat tissue. Strength training two to three times per week is the most effective way to raise your BMR over the long term.
3. HIIT training
High-intensity interval training (HIIT) triggers the EPOC effect (Excess Post-exercise Oxygen Consumption): your body continues consuming oxygen — and burning calories — to recover after the workout, sometimes for up to 48 hours. HIIT is time-efficient: 20 to 30 minutes is typically sufficient.
4. Prioritise quality sleep
Poor sleep is one of the most underestimated metabolic disruptors. Sleep deprivation raises ghrelin (the hunger hormone) and lowers leptin (the satiety hormone) — you eat more without burning more. It also reduces insulin sensitivity, which promotes fat storage. Aim for 7 to 9 hours per night.
5. Do not eat too little
This sounds counterintuitive, but severely restricting calories slows your metabolism. Your body adapts to a large calorie deficit by lowering your BMR — an evolutionary survival mechanism. Crash diets backfire in the long run. A moderate deficit of 300 to 500 calories per day produces more sustainable results.
6. Move more outside of structured exercise (NEAT)
Non-exercise activity thermogenesis (NEAT) — the energy you burn outside of formal workouts — varies enormously between people. Standing versus sitting, taking stairs instead of the lift, walking during calls, fidgeting: small activities accumulate. Research suggests NEAT can differ by up to 2,000 calories per day between individuals.
7. Drink cold water
Drinking 500ml of cold water may temporarily increase metabolic rate by 24 to 30 percent for approximately one hour — your body uses energy to warm the water to body temperature. The absolute effect is modest, but consistently demonstrated in studies. Cold showers activate brown fat tissue, which generates heat by burning calories.
8. Green tea and coffee
Green tea contains catechins that may support fat oxidation. Caffeine temporarily raises metabolism by 3 to 11 percent. Both effects diminish with habitual use — but if you already drink coffee or tea, these are useful incidental benefits.
9. Spicy food (capsaicin)
Capsaicin — the active compound in chilli and cayenne pepper — can temporarily raise metabolic rate. The effect is small (50 to 100 extra calories per day with regular consumption), but a genuinely effortless bonus for those who enjoy spicy food.
10. Manage stress
Chronic stress elevates cortisol. Cortisol promotes fat storage — particularly abdominal fat — and impairs fat metabolism. Breathing exercises, meditation, physical movement, and adequate recovery can reduce cortisol levels. The metabolic benefit is indirect but real.
11. Eat regular meals (avoid extreme fasting windows)
For most people, a consistent meal pattern works better than extended fasting periods. Prolonged fasting can trigger the body's conservation response. That said, moderate intermittent fasting (16:8 or 5:2) has no proven negative effect on resting metabolic rate for most adults.
12. Track what you eat
Awareness is the foundation of everything else. People who track their food intake tend to eat more deliberately and consume less unintentionally. Moveno lets you photograph a meal and instantly see the nutritional breakdown — calories, protein, carbohydrates, fats — so you can make targeted adjustments to support your metabolic goals.
What does not work?
Many metabolism claims are overstated or unsupported by evidence:
- Metabolism-boosting supplements rarely have meaningful scientific backing.
- Many small meals throughout the day do not raise metabolism more than three larger meals — total intake is what matters.
- Detox programmes have no demonstrated effect on metabolic rate.
Start with the three pillars
If you take one thing away: building muscle mass, sleeping well, and eating sufficient protein are the three highest-impact factors for your long-term metabolic rate. To make concrete progress on weight loss, learn to calculate your calorie deficit. For optimal protein intake — the key driver of your BMR — read our guide on high-protein foods. Everything else is supplementary. Start small, build consistency, and track your progress.
Sources
- Happy Healthy — 14 evidence-based ways to boost metabolism — summary of scientifically supported metabolic methods
- Victor Mooren — Boosting metabolism — thermic effect of protein and EPOC explained
- aHealthylife — Ways to boost your metabolism — evidence on water intake and caffeine effects on metabolic rate
