Celsius is facing two class action lawsuits over claims that its energy drinks can “accelerate metabolism” and “burn body fat.” The lawsuits, filed in October 2026, accuse the company of misleading consumers about the health benefits of its beverages.
At the center of the dispute is the scientific research Celsius uses to support its advertising. The plaintiffs argue that the studies do not prove the fat-burning benefits promoted on the company’s packaging. Celsius denies the allegations and maintains that its claims have scientific support.
The dispute centers on whether Celsius’s research supports the benefits advertised on its packaging, particularly the claim that its drinks help consumers burn body fat.
Why Consumers Are Suing Celsius Over Its Energy Drink Labels
The first lawsuit, Nielsen v. Celsius Holdings, Inc., was filed on October 26, 2026, in federal court in Washington. Two days later, a second lawsuit, Valente v. Celsius, Inc., was filed in Illinois. Both challenge the company’s advertising of its energy drinks as products that increase metabolism and help burn body fat.
The complaints focus on statements such as “Accelerates Metabolism,” “Burns Body Fat,” and the brand’s “Live Fit” messaging. According to the plaintiffs, these statements lead consumers to believe that drinking Celsius can help them lose body fat, even without making meaningful changes to their diet or exercise habits.
Celsius has relied on six published university studies to support its marketing claims. However, the plaintiffs argue that the research primarily shows temporary changes in how the body burns calories, rather than actual reductions in body fat. The complaints also question the company’s funding of the studies.
Celsius disputes these allegations. In a statement reported by Food Dive, the company defended its scientific research and noted that the National Advertising Division (NAD), an advertising industry review organization, had previously examined its claims.
The lawsuits are still in their early stages. Neither court has determined that Celsius engaged in false advertising.
Does Burning More Calories Mean Losing Body Fat?
One of the main disagreements in the lawsuits concerns the difference between temporarily burning more calories and actually losing body fat.
Celsius markets its drinks as thermogenic, meaning they can temporarily increase the amount of energy the body uses. Research may show that consuming a beverage increases calorie burning for a limited period. However, that does not necessarily mean drinking it regularly will lead to measurable fat loss.
The plaintiffs argue that Celsius’s advertising does not make this distinction clear. Someone reading “Burns Body Fat” on a can might reasonably expect the product to help reduce body fat, rather than simply increase calorie burning for a short time.
Under the Federal Trade Commission’s Health Products Compliance Guidance, companies must have reliable scientific evidence supporting the health benefits they advertise. The research must support the benefit consumers are likely to understand from the claim, not merely a related biological effect.
This creates a challenge for manufacturers of energy drinks, protein beverages, supplements, and other functional products. A study showing that an ingredient temporarily affects metabolism may not be enough to support claims that the finished product reduces body fat or improves physical performance.
The same concern applies to statements such as “clinically proven” or “scientifically tested.” Even when a company has conducted legitimate research, its advertising must accurately reflect what the studies found.
Can Celsius’s Disclaimer Protect It from False Advertising Claims?
The lawsuits also question whether Celsius adequately explains the limitations of its advertised benefits.
According to the complaints, the front of Celsius packaging prominently displays metabolism and fat-burning claims. Meanwhile, language elsewhere on the packaging explains that the beverage alone does not produce weight loss without a healthy diet and moderate exercise.
The plaintiffs argue that this explanation is not prominent enough to correct the impression created by the front of the can.
A disclaimer can help clarify an advertising statement, but its presence does not automatically protect a company from false advertising liability. Courts may consider whether consumers can easily notice and understand the explanation, particularly when it limits a claim displayed prominently elsewhere on the package.
Federal food labeling law also prohibits false or misleading statements on food and beverage packaging. Under 21 U.S.C. § 343(a)(1), a product may be considered misbranded if its labeling is false or misleading. The Celsius lawsuits rely on state consumer protection laws, but federal labeling requirements provide additional context for evaluating the company’s marketing.
Similar disputes have appeared in other beverage categories. In litigation involving coconut water brand Coco5, consumers challenged whether statements on the packaging accurately represented the product’s ingredients. The case was among the product marketing and labeling disputes involving claims that consumers allegedly understood differently from what the products delivered.
For Celsius, the courts may need to determine whether consumers reasonably interpret “Burns Body Fat” as a promise of actual fat reduction and whether the packaging provides enough information to explain what the company means.
The Juris Law Group, P.C. Perspective on Food and Beverage Law
The Celsius lawsuits show how a company can face advertising challenges even when it has scientific research supporting its products. The central issue is whether the evidence supports the specific benefit consumers understand from the marketing.
For manufacturers and brand owners, food and beverage law involves more than meeting ingredient and safety requirements. Product labels, health-related statements, and advertising materials must also accurately describe what a product can deliver.
Our food and beverage attorneys assess whether marketing claims are supported by appropriate evidence and whether packaging could create misleading consumer expectations. These reviews can also involve state consumer protection laws, which allow consumers to challenge advertising they believe influenced their purchasing decisions.
What Happens Next for Celsius and Other Energy Drink Brands?
Over the next 12 months, Celsius could face closer examination of the research behind its metabolism and fat-burning claims. If the lawsuits move forward, the company may need to defend how its studies support the statements on its packaging and whether consumers receive a clear explanation of the advertised benefits. The litigation could also influence future decisions about product labeling and advertising, although no court has required Celsius to change its claims.
Other functional beverage manufacturers may face similar questions as competition increasingly centers on products advertised for energy, metabolism, fitness, and weight management. Scientific research remains an important part of supporting these benefits, but the wording of the advertising matters just as much. The Celsius cases may help clarify how courts evaluate the difference between what a study measures and what consumers believe a product promises.
Common Legal Inquiries
1. Can energy drink companies legally advertise fat-burning benefits?
Yes, if the claims are truthful, not misleading, and supported by reliable scientific evidence. Manufacturers must consider what consumers reasonably understand the statements to mean. Research showing that a beverage temporarily increases calorie burning may not be sufficient to support a claim that it produces actual body-fat reduction.
2. Can consumers sue a beverage company even if it has scientific studies supporting its claims?
Yes. Having scientific studies does not automatically protect a company from false advertising lawsuits. Consumers may argue that the research does not establish the advertised benefit or that the packaging creates misleading expectations. Courts evaluate the evidence and the specific claims under the applicable law.
3. Can a disclaimer protect a beverage company from false advertising liability?
A disclaimer may help explain a product’s benefits, but it does not guarantee legal protection. Its wording, placement, and visibility matter. If a prominent statement creates a misleading impression, a less noticeable explanation elsewhere on the packaging may not be enough to correct it.
