How to Speed Up Metabolism: 9 Science-Backed Ways to Burn More Calories

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What is metabolism and can you really speed it up?

Your metabolism is the process by which your body converts food into energy. Yourmetabolic rate determines how many calories you burn each day. While much of your metabolism is determined by genetics, age, and sex, there are scientifically proven ways to increase it. The key is understanding what actually works versus what is a myth.

1. Build and maintain muscle mass

Muscle tissue burns more calories at rest than fat tissue — about 6 calories per pound of muscle versus 2 calories per pound of fat per day. While this difference may seem small, it adds up. Building 5-10 pounds of muscle through strength training can increase your resting metabolism by 30-60 calories per day, which translates to 3-6 pounds of fat loss per year without any other changes.

2. Eat enough protein

Protein has the highest thermic effect of food (TEF) — your body burns 20-30% of the calories in protein just digesting it, compared to 5-10% for carbs and 0-3% for fat. Eating 100 calories of protein burns 20-30 calories during digestion. Aim for 1.2-1.6 g/kg of body weight. Use our Protein Calculator to find your target.

3. Stay hydrated

Even mild dehydration slows your metabolism. Studies show that drinking 500ml of water increases metabolic rate by 10-30% for about an hour. Drinking cold water may have a slight additional benefit as your body expends energy to warm it. Find your daily water target with our Water Intake Calculator.

4. Get enough sleep

Sleep deprivation reduces insulin sensitivity and disrupts hunger hormones, leading to increased appetite and reduced fat burning. Studies show that getting fewer than 6 hours of sleep per night can reduce metabolism by 5-8%. Aim for 7-9 hours of quality sleep per night.

5. Drink green tea or coffee

Green tea contains catechins and caffeine, which can boost metabolism by 4-5%. Coffee has a similar effect due to caffeine. These effects are modest but real — drinking 2-3 cups per day could burn an extra 50-100 calories.

6. Eat spicy foods

Capsaicin, the compound that gives chili peppers their heat, can temporarily boost metabolism by about 8%. Adding hot sauce or red pepper flakes to your meals is a simple way to get a small metabolic boost.

7. Do high-intensity interval training (HIIT)

HIIT workouts create an "afterburn" effect — your body continues burning calories at an elevated rate for up to 24 hours after the workout. Even 15-20 minutes of HIIT can be more effective for metabolism than 45 minutes of steady-state cardio.

8. Don't starve yourself

Severe calorie restriction causes metabolic adaptation — your body slows down to conserve energy. Eating too few calories can reduce your metabolism by up to 15-20%. A moderate deficit of 500-750 calories is safer and more sustainable. Use ourCalorie Deficit Calculator to find the right target.

9. Stand up and move more

Standing burns about 50% more calories than sitting. Using a standing desk, taking walking breaks, and increasing your daily steps can add 100-300 calories to your daily burn without formal exercise. This is called NEAT (non-exercise activity thermogenesis).

Metabolism myths to stop believing

• Myth: Eating many small meals boosts metabolism. Fact: Meal frequency has minimal effect on metabolic rate.
• Myth: Certain foods dramatically speed up metabolism. Fact: No single food has a meaningful impact.
• Myth: A slow metabolism is why most people are overweight. Fact: Lifestyle and diet play a much larger role.

When metabolism problems need medical attention

If you have symptoms of a slow metabolism — fatigue, cold intolerance, weight gain despite eating little — you may have an underlying condition like hypothyroidism or insulin resistance. For people with metabolic issues, GLP-1 medications can help by improving insulin sensitivity and supporting weight loss even when metabolism is sluggish.

Check your eligibility with our free GLP-1 Eligibility Calculator.

The bottom line

You can speed up your metabolism through strength training, adequate protein, hydration, quality sleep, and regular movement. Avoid extreme calorie restriction, which backfires by slowing your metabolism. For those with metabolic challenges, medical treatments can provide additional support.