Should you avoid BPA-containing plastic water bottles?
Yes. If a bottle contains BPA, choose glass or stainless steel instead.
What is actually in it
BPA is bisphenol A. It is used in some polycarbonate plastic and food-contact materials. Not every plastic water bottle contains BPA, but BPA-containing bottles are a poor daily default.
The issue is repeated contact between drinking water, plastic, heat, and time. Hot cars, dishwashers, scratches, and long storage can all make plastic a worse choice.
What the research says
A 2026 Toxicology study tested BPA in human intestinal Caco-2 cells.
The study found that BPA reduced mitochondrial respiration and mitochondrial membrane potential. The authors concluded that BPA compromised oxidative phosphorylation and energy metabolism in intestinal cells.
This is a cell study, not a bottled-water exposure study. It supports avoiding BPA where the swap is easy. It does not prove one sip from one bottle causes gut disease.
What to do instead
Use glass or stainless steel for daily water. Do not leave plastic bottles in hot cars. Replace scratched plastic. If a bottle is marked polycarbonate or resin code 7 and does not clearly say BPA-free, skip it.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Deleterious effects of plastic component bisphenol a on mitochondrial function in human intestinal cells. | Toxicology | 2026 |