Do Celsius Burn Body Fat? Guide

Celsius is marketed as a fitness drink that can help you burn body fat. The short answer is that Celsius drinks contain ingredients with some evidence for increasing metabolism, but the effect is modest, and no drink alone will produce meaningful fat loss. Real fat loss still comes down to a sustained calorie deficit, and Celsius is at best a minor supporting tool, not a solution.

What Is Celsius and What Is in It?

Celsius is a carbonated energy drink sold in cans and powders. It contains caffeine, green tea extract, ginger, and a blend of vitamins. The company markets it as a “thermogenic” drink, meaning it is designed to raise your body temperature and energy expenditure slightly.

Each standard can contains 200 mg of caffeine. That is roughly the amount in two cups of coffee. It also includes green tea extract, which contains catechins like EGCG, and other plant compounds.

The drink is sugar-free in most varieties, using sucralose or erythritol as sweeteners. This matters because a sugar-free drink does not add calories, which is one reason people use it while dieting.

Do Celsius Burn Body Fat?

Celsius does not burn body fat on its own. No drink does. What Celsius can do is slightly increase the number of calories your body burns at rest, which is called thermogenesis. That effect is driven mostly by caffeine and green tea extract.

Research on caffeine and green tea shows they can increase energy expenditure by a small amount, often in the range of 3 to 5 percent for a few hours after consumption. Some studies show slightly higher numbers, but the effect is temporary and small in absolute terms.

To put that in perspective, a 3 percent increase in a 2,000-calorie daily burn is about 60 calories. That is roughly one small apple. Over a week, that could add up to a few hundred calories, but it is easily erased by a single snack or a slightly larger portion at dinner.

There is also some evidence that caffeine can increase fat oxidation, meaning the body uses more fat for fuel during exercise. But this does not automatically mean you lose fat. The body adjusts over time, and regular caffeine users often develop tolerance, which blunts these effects.

What the Research Actually Shows

Some studies have looked at Celsius specifically. The company has funded research on its own product, and those studies reported increases in energy expenditure and fat oxidation after drinking Celsius. That is worth noting because company-funded research can introduce bias, and independent replication is limited.

Broader research on thermogenic ingredients is more established. Caffeine is one of the most studied compounds in sports nutrition. It clearly improves alertness and can enhance exercise performance. Green tea extract has been studied for weight loss, and the results are modest at best.

A review of green tea studies found that the average weight loss difference between green tea groups and placebo groups was small, often around 1 to 2 pounds over several months. That is not nothing, but it is also not dramatic.

The evidence does not support the idea that Celsius or similar drinks cause significant fat loss by themselves. The effect exists, but it is small enough that most people would not notice it without tracking calories carefully.

How Caffeine and Green Tea Work in the Body

Caffeine works by blocking adenosine receptors in the brain. Adenosine is a compound that promotes sleep and relaxation. When caffeine blocks it, you feel more alert, and your nervous system activity increases. That increased activity signals the body to release adrenaline, which raises heart rate and energy expenditure.

Green tea catechins, especially EGCG, appear to inhibit an enzyme called COMT. This enzyme breaks down adrenaline and noradrenaline. By slowing that breakdown, EGCG may extend the fat-burning signal that caffeine starts. This is why the combination of caffeine and green tea is common in thermogenic products.

The effect is real but limited. Your body has regulatory systems that prevent energy expenditure from rising too high. Even with both compounds working together, the increase in calorie burn is small and short-lived.

The Difference Between Thermogenesis and Fat Loss

Thermogenesis is the production of heat in the body. It is part of how your body burns calories. But thermogenesis is not the same as fat loss. Fat loss happens when your body is in a calorie deficit over a sustained period, meaning you burn more calories than you consume.

Even if Celsius increases your daily burn by 50 to 100 calories, that deficit is meaningless if you consume extra calories elsewhere. Many people drink Celsius while also eating more, either because the drink increases appetite or because they feel justified in eating more since they are “working out.” This cancels out any benefit.

There is also a question of tolerance. Regular caffeine users build tolerance to its effects on heart rate and energy expenditure. If you drink Celsius every day, the thermogenic effect may diminish over time. Some research suggests the fat-oxidation benefits of caffeine are stronger in people who do not consume caffeine regularly.

Does Celsius Help With Exercise Performance?

There is stronger evidence that caffeine improves exercise performance than there is for thermogenic fat loss. Caffeine has been shown to reduce perceived effort during exercise, meaning workouts feel slightly easier. It can also improve endurance and power output in some people.

This matters for fat loss indirectly. If caffeine helps you work out harder or longer, you burn more calories during exercise. That is a more meaningful effect than the small thermogenic bump from the drink itself.

But again, this is not unique to Celsius. A cup of coffee before a workout would provide a similar benefit. You do not need a specialty drink to get the performance effects of caffeine.

Are There Risks to Drinking Celsius?

Celsius is generally safe for healthy adults in moderation. The main concern is caffeine intake. At 200 mg per can, a single serving is within most safety guidelines, which generally suggest keeping caffeine under 400 mg per day for healthy adults.

Drinking multiple cans in a day can push you past that limit. High caffeine intake can cause anxiety, insomnia, rapid heart rate, and digestive issues. People with heart conditions, high blood pressure, or anxiety disorders should be cautious.

Pregnant women are advised to limit caffeine to 200 mg per day. That means a single can of Celsius would use up the entire recommended daily allowance. Breastfeeding women should also be cautious, as caffeine passes into breast milk.

There is also the question of artificial sweeteners. Sucralose and erythritol are generally recognized as safe, but some people experience digestive discomfort, especially with erythritol. If you notice stomach issues after drinking Celsius, that may be the cause.

What Actually Burns Body Fat

Fat loss is governed by energy balance. You need to consume fewer calories than you burn. This can be achieved through diet, exercise, or both, but diet tends to have a larger effect because it is easier to overeat than to out-exercise a bad diet.

Protein is the most important macronutrient for fat loss. It keeps you full, preserves muscle mass, and has a higher thermic effect than carbohydrates or fat, meaning your body burns more calories digesting it.

Resistance training also matters. Building or maintaining muscle increases your resting metabolic rate because muscle tissue burns more calories than fat tissue. Cardio burns calories during the activity, but strength training has a longer-lasting effect.

Sleep is often overlooked. Poor sleep increases hunger hormones and decreases satiety hormones, which makes it harder to stick to a calorie deficit. One study found that sleep-deprived people consumed more calories the next day.

Should You Drink Celsius for Fat Loss?

If you enjoy the taste and the energy boost, Celsius can be part of a fat-loss plan. It is sugar-free, which means it does not add calories, and the caffeine may help you exercise harder. But you should not expect it to cause fat loss on its own.

The evidence for thermogenic drinks is real but modest. The effect is small enough that it will not matter unless you are already doing the hard work of maintaining a calorie deficit and exercising consistently.

If you are sensitive to caffeine, you may want to avoid Celsius or drink it only in the morning. Drinking it late in the day can disrupt sleep, which would work against your fat-loss goals.

There is nothing magic in Celsius. It is a caffeinated drink with some plant extracts. The same benefits are available from coffee and green tea at a lower cost. The real work of fat loss happens in the kitchen and in your training, not in a can.