Is it safe to use plastic straws for hot drinks?
No. Plastic straws are not designed for high temperatures, and research shows that heat causes them to release harmful chemicals into your drink.
What's actually in it
Plastic straws are typically made from materials like polyethylene. These plastics are not inert. When you expose them to heat, they can leak a variety of chemicals into your drink.
These include phthalates (chemicals used to make plastic flexible), bisphenols, and perfluorinated compounds. These substances are known to migrate out of plastic containers, especially when the temperature rises, according to a 2026 study in J Environ Sci Health B.
What the research says
The science is clear: heat changes how plastic behaves. A 2026 study in J Food Sci Technol confirms that the migration of phthalates from plastic increases significantly under different temperature conditions. This means your hot coffee or tea is actively pulling chemicals out of the straw and into your body.
Beyond chemical leaching, there is the risk of swallowing tiny pieces of plastic. A 2026 study in Drug Chem Toxicol found that even a single exposure to polyethylene terephthalate microplastics can cause metabolic and gastrointestinal disruption. This peer-reviewed research shows that these materials are not safe for daily use, particularly when heat is involved.
The research at a glance
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