A Columbia/Rutgers study found 240,000 plastic particles per liter of bottled water—90% nanoplastics small enough to enter cells, the bloodstream and even the brain. Many particles come from the bottles and filters themselves. Nanoplastics may cause inflammation, immune disruption and cancer. Industry groups dismiss the findings as plastic pollution surpasses 430 million tons yearly. Experts urge using stainless steel or glass and choosing filtered tap water.
