Several foods and beverages can temporarily increase your metabolic rate, mostly by raising the energy your body spends digesting them or by stimulating heat production. The effects are real but modest. No single food will dramatically change your calorie burn on its own, but incorporating several of these into an overall balanced diet can add up over time.
Whole Grains and High-Fiber Foods
Swapping refined grains for whole grains is one of the more reliable ways to nudge your daily calorie burn upward. A study from Tufts University found that people eating whole grains lost close to an extra 100 calories per day compared to people eating refined grains. That’s roughly equivalent to a brisk 30-minute walk. The extra burn came from two sources: a higher resting metabolic rate and more calories passing through unabsorbed. Interestingly, the effect wasn’t just from the fiber itself. The fiber changed how efficiently the body absorbed calories from other foods eaten alongside it.
Practical choices here include oats, brown rice, quinoa, barley, and whole-wheat bread. Legumes like lentils and black beans also fit this category because they’re high in both fiber and protein, which increases the energy cost of digestion even further.
Protein-Rich Foods
Protein has the highest thermic effect of any macronutrient. Your body uses roughly 20 to 30 percent of the calories in protein just to digest and process it, compared to 5 to 10 percent for carbohydrates and 0 to 3 percent for fat. This means a meal centered on chicken breast, eggs, fish, Greek yogurt, or tofu costs your body more energy to break down than the same number of calories from pasta or bread.
Beyond the thermic effect, protein helps preserve muscle mass, which matters because muscle tissue burns more calories at rest than fat tissue does. If you’re losing weight and not eating enough protein, you’ll lose muscle along with fat, and your resting metabolic rate will drop. Spreading protein across meals rather than loading it all into dinner tends to keep that thermic boost more consistent throughout the day.
Chili Peppers and Spicy Foods
The compound that makes chili peppers hot, capsaicin, triggers a measurable increase in energy expenditure. Your body responds to it by generating heat, a process called thermogenesis. Research estimates that a 10 to 13 percent increase in metabolic rate from capsaicin can translate to an extra 100 to 130 calories burned per day. A 2024 study in Frontiers in Nutrition found that even low doses (2 to 4 milligrams of capsaicinoids daily, roughly a small amount of cayenne pepper) significantly increased both resting and exercise-related energy expenditure over 28 days.
That said, the real-world impact depends on tolerance. People who eat spicy food regularly tend to develop a tolerance to capsaicin’s metabolic effects. And the calorie burn, while measurable in a lab, won’t overcome a large calorie surplus on its own.
Green Tea and Coffee
Caffeine is the most widely consumed metabolic stimulant in the world, and it works. Metabolic rate increases significantly during the three hours after caffeine ingestion. The size of the boost varies by body weight and caffeine tolerance, but it’s consistent enough to show up reliably in studies.
Green tea adds a second mechanism on top of caffeine. It contains a compound called EGCG that increases fat oxidation, the rate at which your body breaks down stored fat for energy. Decaffeinated green tea extract providing 366 milligrams of EGCG has been shown to increase fat oxidation by 17 percent. Regular green tea contains both caffeine and EGCG, so the two effects stack. Two to three cups a day is the range most commonly studied.
Coffee works primarily through caffeine alone. Black coffee with no added sugar or cream is essentially calorie-free while providing the metabolic bump. Adding cream and sugar can easily cancel out any extra calories burned.
Ginger
Ginger has a mild thermogenic effect similar to chili peppers but without the intense heat. A pilot study in overweight men found that consuming 2 grams of ginger powder dissolved in hot water with breakfast increased the thermic effect of the meal by about 43 calories per day compared to the same meal without ginger. Ginger also reduced hunger and increased feelings of fullness, which may matter more for weight management than the calorie burn itself.
Fresh ginger in cooking, ginger tea, or powdered ginger added to smoothies are all practical ways to include it. The amounts used in research are modest, roughly half a teaspoon of ground ginger.
Water
Drinking water, especially cold water, requires your body to spend energy warming it to body temperature. The effect is small per glass but adds up if you’re consistently well-hydrated versus chronically underhydrated. Water also suppresses appetite for a short period after drinking it, which can help reduce calorie intake at meals. Drinking a glass before eating is a simple habit with a mild but consistent effect.
Apple Cider Vinegar
Vinegar’s active ingredient, acetic acid, influences fat metabolism at a cellular level. In lab studies, acetic acid triggers a signaling pathway that increases fat breakdown while simultaneously reducing the creation of new fat. It does this by consuming energy within cells, which activates an enzyme that shifts the cell’s priorities toward burning fat rather than storing it. Cell studies have shown significantly reduced fat accumulation in treated cells.
The leap from cell studies to meaningful weight loss in humans is a large one, and the evidence in people is limited. Small amounts of apple cider vinegar diluted in water before meals may offer a slight metabolic advantage, but it’s one of the less proven options on this list.
Foods That Support Thyroid Function
Your thyroid gland is the master regulator of your metabolic rate, and it depends on specific minerals to function properly. If you’re deficient in any of these, your metabolism can slow down regardless of what else you eat.
- Iron is essential for the enzyme that synthesizes thyroid hormones. Iron deficiency reduces the conversion of inactive thyroid hormone to its active form, which can lead to a sluggish metabolism. It also blunts the body’s ability to generate heat in cold environments. Good sources include red meat, spinach, lentils, and fortified cereals.
- Zinc plays a role at multiple points in thyroid hormone production, from signaling in the brain to the conversion of inactive thyroid hormone into its active form. Zinc deficiency can lead to low thyroid function and has been associated with structural changes in the thyroid gland itself. Oysters, beef, pumpkin seeds, and chickpeas are rich sources.
- Selenium is a component of the enzymes that activate thyroid hormones throughout the body. Brazil nuts are the most concentrated food source, with just two or three nuts providing a full day’s requirement. Fish, eggs, and sunflower seeds also contribute.
These minerals won’t “boost” metabolism above normal in someone who’s already well-nourished. Their value is in preventing the metabolic slowdown that comes with deficiency, which is surprisingly common, especially for iron in women of reproductive age.
Putting It in Perspective
Each of these foods creates a real but small effect. An extra 50 to 100 calories burned per day from whole grains, another 40 or so from ginger, a modest bump from green tea and protein: individually, none of these will produce dramatic weight loss. Combined and sustained over months, they can contribute to a meaningful difference. The most impactful changes on this list are eating more protein, choosing whole grains over refined grains, and staying consistent with caffeine sources like green tea or coffee. These have the strongest evidence and the most practical staying power in a normal diet.