Several common drinks can temporarily increase your metabolic rate, with coffee and green tea having the strongest research behind them. The effects are real but modest: most metabolism-boosting beverages raise your calorie burn by a small percentage for a few hours at a time. No drink will override your overall diet, but choosing the right ones consistently can add up over weeks and months.
Coffee
Coffee is the most widely studied metabolism booster. Caffeine increases your resting metabolic rate significantly for about three hours after you drink it, and the effect applies to both lean and overweight individuals. Black coffee also triggers your body’s cellular recycling process, the same cleanup mechanism that kicks in during fasting. Both regular and decaffeinated coffee activate this response, though caffeine provides the additional thermogenic bump.
The FDA considers up to 400 milligrams of caffeine per day safe for most adults, roughly two to three 12-ounce cups of brewed coffee. Going beyond that doesn’t meaningfully increase the metabolic benefit and starts introducing side effects like jitteriness, disrupted sleep, and elevated heart rate. If you’re drinking coffee specifically for its metabolic effects, black is the way to go. Adding cream, sugar, or flavored syrups can easily outweigh the extra calories you’re burning.
Green Tea
Green tea works through two mechanisms at once: its caffeine content and a plant compound called EGCG that independently promotes fat burning. A systematic review found that daily green tea consumption providing 100 to 460 mg of EGCG led to measurable reductions in body fat and body weight when consumed for 12 weeks or more. That range translates to roughly two to four cups of brewed green tea per day, depending on the brand and steeping time.
The combination of caffeine and EGCG appears to be more effective than either alone. Green tea’s caffeine content is lower than coffee (about 30 to 50 mg per cup versus 95 mg), so the thermogenic effect is gentler but still present. In animal research, green tea polyphenols also reduced visceral fat, the deep abdominal fat linked to metabolic disease, and decreased inflammatory markers in fat tissue. Green tea was the only tea type in that study that also reduced food intake, by about 10%.
Oolong and Black Tea
Oolong and black tea share the same plant origin as green tea but are processed differently, which changes their chemical profile. Research comparing all three found that each type significantly reduced body weight, visceral fat, and liver fat accumulation in mice fed a high-fat diet. The anti-inflammatory effects were consistent across all three teas, with oolong and green tea both increasing levels of adiponectin, a hormone that helps regulate fat metabolism.
Oolong tea sits between green and black tea in terms of oxidation, and its caffeine content falls in a similar middle range. If you don’t enjoy the grassy taste of green tea, oolong and black tea still offer meaningful metabolic benefits, just through a slightly different mix of polyphenols.
Cold Water
Drinking cold water forces your body to expend energy warming it to body temperature, a process called water-induced thermogenesis. In one study, overweight children who drank cold water (about 4°C) saw their resting energy expenditure rise to 25% above baseline, peaking around 57 minutes after drinking. The elevated burn lasted over 40 minutes.
The absolute number of extra calories is small. But water has zero calories, so the math always works in your favor. Drinking a glass of cold water before meals also tends to reduce how much you eat. If you’re already hydrating throughout the day, switching from room-temperature to cold water is a zero-effort upgrade.
Ginger Tea
Hot ginger water made from about 2 grams of dried ginger powder increased the thermic effect of a meal by roughly 43 calories compared to plain hot water in a study of overweight men. That’s a modest bump, but the more interesting finding was the appetite effect: participants reported significantly less hunger, lower anticipated food intake, and greater fullness after consuming the ginger drink.
The dual effect on calorie burn and appetite makes ginger tea a practical option, especially after meals. You can steep fresh ginger slices or dissolve a half teaspoon of dried ginger powder in hot water. The metabolism boost is small on its own, but the reduced hunger may be the more useful benefit for weight management.
Yerba Mate
Yerba mate, a traditional South American tea, stands out for its effects during exercise. A study published in Nutrition & Metabolism found that drinking yerba mate before a workout increased fat burning by 24% across all light and moderate exercise intensities. At the same time, the body relied less on carbohydrates for fuel, effectively shifting the energy source toward stored fat.
This makes yerba mate particularly useful as a pre-workout drink. The fat-burning boost was most pronounced at lower exercise intensities, the kind of effort you’d sustain during a brisk walk or easy jog. Yerba mate contains caffeine (about 85 mg per cup), along with other stimulant compounds, so it contributes to total daily caffeine intake.
Protein Drinks
Protein shakes and smoothies don’t contain a metabolism-boosting compound the way caffeine does. Instead, they work through the thermic effect of food: your body burns more energy digesting protein than any other macronutrient. Protein requires 20 to 30% of its calorie content just to be processed, compared to 5 to 10% for carbohydrates and 0 to 3% for fat.
In practical terms, if you drink a protein shake with 30 grams of protein (about 120 calories), your body spends 24 to 36 of those calories on digestion alone. A carbohydrate-heavy smoothie with the same calorie count would only cost your body 6 to 12 calories to process. This difference adds up across multiple meals and snacks each day, which is one reason high-protein diets consistently increase total daily energy expenditure in research.
Apple Cider Vinegar Drinks
Diluted apple cider vinegar has gained popularity as a metabolism hack, and there is a plausible mechanism behind it. The acetic acid in vinegar activates a cellular energy sensor that simultaneously increases fat breakdown and decreases new fat production. In lab studies on liver cells, acetic acid treatment significantly reduced the accumulation of stored fat through this pathway.
The gap between cell studies and real-world results is significant, though. Human evidence for vinegar’s effect on metabolic rate is limited, and any impact on weight is likely small. If you enjoy the taste of a tablespoon of apple cider vinegar diluted in water, it’s a low-calorie habit with some biological rationale. Just don’t drink it undiluted, as the acidity can damage tooth enamel and irritate your throat.
How Much These Effects Actually Matter
The honest picture is that no drink produces dramatic metabolic changes on its own. Coffee and green tea have the strongest evidence, but even their effects amount to burning maybe 50 to 100 extra calories per day. That’s roughly equivalent to walking for 15 minutes. Where these drinks become genuinely useful is in combination with each other and with other habits. Drinking cold water throughout the day, having green tea or coffee with meals, using ginger tea after dinner, and choosing a protein shake over a sugary smoothie can collectively shift your daily energy balance by a few hundred calories without requiring willpower or restriction.
The appetite-suppressing effects of several of these drinks, particularly ginger tea, green tea, and protein shakes, may ultimately matter more than the direct calorie burn. Burning 43 extra calories from ginger tea is trivial. Eating 200 fewer calories because you feel full is not.