Belgian researchers discovered that these straws can contain per- and polyfluorinated alkyl substances (PFAS), which are long-lived and potentially toxic chemicals. The study analyzed 39 brands of straws made from paper, bamboo, glass, stainless steel, and plastic. PFAS were found in almost all types of straws, except for those made of stainless steel. The highest levels of PFAS were detected in paper and bamboo straws, with 18 out of 20 paper straws and four out of five bamboo straws being affected.

PFAS are known for their use in various everyday products and have been criticized for their harmful effects on the environment and health. Although the levels of PFAS found in the straws are low, they can still contribute to the chemical load in the body.

The researchers suggest using stainless steel straws as a more environmentally friendly alternative, or simply drinking beverages without a straw. It is important for consumers to be aware that paper or bamboo straws may not be biodegradable as commonly believed.