A European study reveals that around 90% of eco-friendly paper straws contain “forever chemicals” called PFAS, which do not easily break down and can accumulate in the body, potentially causing health issues. New Atlas reports: “Forever chemicals” is the colloquial name given to a class of more than 12,000 chemicals, more formally known as poly- and perfluoroalkyl substances (PFAS), that barely break down in the environment or in our bodies. Hence, the “forever” part. […] The researchers tested 39 different brands of straws made from paper, glass, bamboo, stainless steel, and plastic, and analyzed them for 29 different PFAS compounds. The majority of brands tested (69%) contained PFAS, with 18 different PFAS detected in total. Paper straws were most likely to contain PFAS, with the chemicals detected in 90% of the brands tested, albeit in highly variable concentrations. Perfluorooctanoic acid (PFOA), a compound linked to high cholesterol, a reduced immune response, thyroid disease and increased kidney and testicular cancer, was most frequently detected. PFOA has been banned globally since 2020. Also detected were trifluoroacetic acid (TFA) and trifluoromethanesulfonic acid (TFMS), ultra-short-chain PFAS that are highly water-soluble and so might leach out of straws into drinks.

Bamboo straws fared only slightly better than paper ones, with PFAS found in 80% of brands tested. The chemicals were found in 75% of plastic straws and 40% of glass brands. PFAS were not detected in any of the steel straws tested. The PFAS concentrations were low and, the researchers say, pose a small risk to human health. However, the problem with PFAS is that they’re bioaccumulative, meaning they can build up over time because they’re absorbed but not excreted. The researchers say that while the study did not determine whether PFAS were added to the straws or were the result of contamination — for example, from the soil in which the plant-based materials are grown — the presence of the chemicals in almost every brand of paper straw means it’s likely that, in some cases, PFAS were used as a water-repellent coating. The study also did not examine whether PFAS leached out of the straws into the liquid they were sitting in. To be safe, the researchers suggest people start using stainless steel straws, or ditch straws altogether. The study was published in the journal Food Additives and Contaminants.