A UK doctor says how you drink water—not just what—can lead to stomach issues. Bacteria in reused bottles may cause nausea, vomiting, and more.
Improper Water Habits May Be Harming Your Health
Stomach pain could be coming from a surprising source—not from what you drink, but how you drink it. Dr. Gareth Nye, Programme Lead for Medical Science at the University of Salford, has warned that bacteria buildup in reused or poorly cleaned water bottles may lead to gastrointestinal distress without people realizing the cause.
On-the-Go Hydration Could Come at a Cost
Speaking in partnership with InSinkErator, Dr. Nye highlighted the hidden risks of plastic water bottles, especially when used repeatedly without proper cleaning. “Plastic products are full of chemicals which can be hazardous to health,” he explained, adding that neglecting to wash bottles daily can result in dangerous bacterial growth.
Alarming Bacteria Levels in Bottled Water
A BBC study cited by Dr. Nye revealed water bottles could harbour an average of 20.1 million bacteria per millilitre—compared to just 600 bacteria per millilitre found in public toilets. The presence of bacteria such as E. coli, Staphylococcus aureus, and Pseudomonas aeruginosa in bottles poses a clear risk, especially when consumed over time.
Common Symptoms and High-Risk Groups
Bacteria from contaminated bottles can cause gastrointestinal issues like nausea, vomiting, and diarrhea within 24 to 72 hours of exposure. “These symptoms may seem mild but can become dangerous for vulnerable populations such as young children, older adults, or those with weakened immune systems,” Dr. Nye warned. In severe cases, these infections could lead to dehydration or hospitalization.
Best Practices for Safer Hydration
To reduce the risk, Dr. Nye recommends avoiding plastic bottles where possible and opting for safer alternatives such as glass or stainless steel. If plastic bottles are used, they should be thoroughly cleaned daily with hot water and soap. Drinking straight from the tap, especially when at home, is also a safer bet.
How Much Water Is Enough?
While there’s no fixed rule for daily water intake, the National Academies of Sciences suggests healthy adults should consume around 2.7 litres per day for women and 3.7 litres for men—including water from both food and beverages. Experts emphasize tailoring intake based on factors like age, climate, and physical activity.
A Reminder for Everyday Health
With rising awareness around hydration, Dr. Nye’s advice serves as a timely reminder that clean habits matter just as much as quantity. When it comes to drinking water, staying safe may be as simple as choosing the right bottle—and keeping it clean.
