Origin of the Mountain Dew Dissolve Mouse Myth
The idea that Mountain Dew can dissolve a mouse originates from a now-deleted 2004 internet post and a lawsuit filed in 2005 against PepsiCo. A plaintiff in Tennessee claimed a mouse had fallen into a can of Mountain Dew and that the soda would dissolve the rodent entirely. The case was dismissed in 2006 because forensic evidence showed the mouse had been stored in the can for a long time and was not dissolved by the drink. PepsiCo and its bottlers have repeatedly stated that the claim is false and that Mountain Dew does not have the chemical properties to dissolve a mouse or any animal carcass in a sealed can.
Despite the lawsuit's dismissal, the story spread widely through forums and social media, turning into a long-standing urban legend. The myth persists because it combines a vivid, visceral image with a brand name, making it easy to remember and share. Scientific analyses of soft drink acidity show that while Mountain Dew is more acidic than water, its pH is not low enough to rapidly decompose organic tissue like a mouse. The myth has no basis in food science, toxicology, or chemistry, and major fact-checking organizations have repeatedly debunked it.
Scientific Facts About Soft Drink Acidity and Organic Matter
pH Levels in Carbonated Beverages
Mountain Dew contains citric acid, phosphoric acid, and carbonic acid, giving it a pH typically between 3.2 and 4.0, which is more acidic than most fruit juices but far less acidic than stomach acid or laboratory hydrochloric acid. According to food science research, a pH in this range can slowly affect certain metals and minerals over time but does not create the conditions needed to dissolve soft tissue, bones, or cartilage in a sealed container within days or weeks. The U.S. Food and Drug Administration regulates beverage acidity for safety, and all major soft drinks, including Mountain Dew, must remain within pH limits that prevent corrosion of can linings and equipment, not to break down foreign organic matter.
In controlled laboratory settings, strong acids and enzymes are required to break down animal tissue, and even then the process takes much longer than the shelf life of a canned beverage. The dissolved mouse story ignores basic principles of biology and chemistry, including the fact that a mouse's bones, teeth, and connective tissues are made of calcium phosphate and keratin, which are highly resistant to weak organic acids. The myth also overlooks the fact that carbonation and sugar content do not accelerate tissue decomposition in any meaningful way inside a sealed can.
Impact on PepsiCo, Consumer Lawsuits, and Brand Reputation
Legal and Regulatory Context
The 2005 lawsuit against PepsiCo was dismissed on summary judgment after the court found no credible evidence that Mountain Dew could dissolve a mouse, and the plaintiff's evidence was deemed unreliable. PepsiCo has not faced any successful litigation based on the dissolve mouse claim, and no regulatory agency, including the U.S. Consumer Product Safety Commission or the FDA, has ever issued a warning or recall related to this myth. The company's public statements and legal filings consistently describe the claim as false and have used the case as an example of frivolous litigation in the beverage industry.
Consumer perception studies and brand tracking data show that viral food and beverage myths can temporarily affect purchasing intent, especially among younger demographics who encounter the stories on social media. PepsiCo's Mountain Dew brand continues to rank among the top citrus-flavored soft drinks in the U.S., with consistent annual sales growth reported by market research firms. The company has addressed the myth in media interviews and online communications, emphasizing that its products are safe and manufactured under strict quality controls. For more information on PepsiCo's financial performance and legal disclosures, you can review the company's latest annual report and SEC filings available at