Everyday Chemicals Found to Harm Gut Bacteria
A new study reveals that many common chemicals can damage beneficial gut bacteria and may even encourage antibiotic resistance. Researchers are calling for chemical safety testing to account for these hidden effects.
Hidden Toxicity in Everyday Life
Scientists at the University of Cambridge screened 1,076 chemicals to determine their effects on 22 species of gut bacteria. They identified 168 substances that inhibit bacterial growth.
These chemicals are often found in food, drinking water, and the environment. Many were previously thought to have minimal impact on living organisms.
Connection to Antibiotic Resistance
When gut microbes adapt to chemical stress, some may also develop resistance to antibiotics like ciprofloxacin. If this occurs in humans, infections could become harder to treat.
Common Chemicals That Pose Risks
The harmful substances include pesticides like herbicides and insecticides, as well as industrial compounds used in plastics and flame retardants.
Why Gut Bacteria Matter
The human gut contains around 4,500 bacterial species. These microbes support digestion, immunity, metabolism, and even mental health. Disrupting this system can contribute to digestive issues, obesity, and other health problems.
Predicting Harm With AI
The Cambridge team used their data to develop a machine learning model. It can predict whether new or existing industrial chemicals are likely to harm gut bacteria.
Calls to Rethink Chemical Safety
Dr Indra Roux explained that chemicals designed for one target, like insects or fungi, can also affect human gut microbes. Professor Kiran Patil said the study provides data to help design safer chemicals in the future.
Dr Stephan Kamrad added that safety tests should ensure new chemicals do not harm gut bacteria, which may be exposed through food and water.
From Lab Findings to Real-World Exposure
While the lab findings are significant, real-world exposure levels are not yet clear. Researchers plan to monitor whole-body exposure to better understand risks.
Meanwhile, they suggest practical measures to reduce exposure: wash fruits and vegetables thoroughly and avoid using pesticides at home.
