Cancer Risk from Canned Sparkling Water? Experts Weigh In on PFAS Concerns
In an era where daily headlines often spotlight new cancer risks, from deli meats to sugary drinks, a recent worry has bubbled up: could canned sparkling water increase your risk of colorectal cancer? Social media influencers on platforms like Instagram and TikTok have fueled this anxiety, alleging that these beverages, marketed as healthier soda alternatives, harbor undisclosed chemicals and high levels of "forever chemicals" linked to cancer. To separate fact from fear, HuffPost consulted two colorectal cancer specialists for their insights on this sparkling debate.
The Real Concern: Packaging, Not the Drink Itself
The potential link between sparkling water and cancer does not stem from the carbonated liquid but from its containers. Many cans feature protective linings or are exposed to contaminants during manufacturing and packaging, including per- and polyfluoroalkyl substances (PFAS), commonly known as forever chemicals. Plastic bottles, another common packaging option, are also associated with PFAS exposure. Dr. Maen Abdelrahim, section chief of Gastrointestinal Medical Oncology at Houston Methodist, explains that PFAS earn their "forever" moniker because they persist in the environment and accumulate in the human body over time.
Research has connected PFAS to elevated risks of various cancers, such as kidney and testicular cancer, along with other health issues like impaired immunity, liver damage, infertility, and thyroid disease. However, Dr. Steven Lee-Kong, division chief of colorectal surgery at Hackensack Meridian Health’s Hackensack University Medical Center, notes that while some studies have detected PFAS in popular sparkling water brands, the levels typically fall well below current federal advisory limits. Abdelrahim emphasizes that dosage is critical; the amount leached from beverage cans is far lower than levels shown to cause cancer in experimental studies. Yet, Lee-Kong cautions that low levels do not automatically guarantee safety, as science is evolving, and some health organizations argue even minimal exposure could pose risks.
How PFAS Might Contribute to Cancer Development
Abdelrahim outlines several mechanisms by which PFAS exposure could theoretically lead to cancer over the long term. These chemicals can act as endocrine disruptors, promote oxidative stress, alter gene expression, or interfere with DNA repair processes, all of which may contribute to carcinogenesis. Additionally, Lee-Kong explains that evidence suggests PFAS may disrupt the intestinal barrier, leading to gut inflammation, damage to the intestinal lining, and changes to the gut microbiome—the community of microorganisms in the intestines. Chronic inflammation is a well-established risk factor for colorectal cancer, and some PFAS might alter intestinal cells in ways that promote tumor growth. While research remains ongoing and sometimes inconsistent, the potential for PFAS to cause gut inflammation and cellular changes is the primary concern regarding colorectal cancer risk.
Should You Be Worried? Expert Recommendations
The straightforward answer is that it is unclear, as the science is still in its early stages. Abdelrahim points out that there is currently no direct evidence concluding that canned sparkling water or seltzer can cause colon cancer. Based on existing data, canned sparkling water is not considered a significant source of PFAS exposure. However, more long-term studies are needed to fully understand the relationship between canned beverages and cancer risk. Until then, Lee-Kong advises consumers to be mindful: drink sparkling water in moderation, diversify beverage choices, and prioritize filtered water for optimal hydration. He suggests that when choosing canned beverages, do so as part of a balanced and varied diet.
Beyond beverage choices, Abdelrahim recommends focusing on well-established modifiable risk factors for colorectal cancer. These include maintaining a healthy weight, limiting processed and red meat intake, avoiding tobacco, moderating alcohol consumption, staying physically active, and adhering to age-appropriate screening guidelines. Regulatory bodies like the U.S. Environmental Protection Agency (EPA) are actively investigating PFAS risks, and Lee-Kong encourages staying informed through reliable sources like the EPA and being conscious of consumption habits for long-term health.
The original version of this story was published on HuffPost at an earlier date.
