Researchers have discovered that many so-called ‘eco-friendly’ paper straws contain poly- and perfluoroalkyl substances (PFAS). 

PFAS, dubbed “forever chemicals” due to their slow breakdown in the environment, were detected in 90 per cent of paper straws tested, among other materials.

PFAS, widely used to make products water and stain-resistant, have been associated with various health issues, including lower vaccine response, thyroid disease, and cancer.

The study, which analysed 39 straw brands made from paper, bamboo, glass, stainless steel, and plastic, also found these chemicals in plant-based materials like bamboo straws.

Dr Thimo Groffen, an environmental scientist at the University of Antwerp, cautioned against assuming the sustainability of plant-based straws, saying; “The presence of PFAS in these straws means that's not necessarily true”.

While the study indicated low PFAS concentrations in straws, cumulative exposure over time remains a concern. 

The source of PFAS in the straws remains uncertain, possibly originating from manufacturing processes or contamination from growth environments.

Stainless steel straws emerged as a safe alternative, as they showed no PFAS presence. 

Dr Groffen recommended their use, concluding; “The presence of PFAS in paper and bamboo straws shows they are not necessarily biodegradable. We did not detect any PFAS in stainless steel straws, so I would advise consumers to use this type of straw – or just avoid using straws at all”. 

The full study is accessible here.