This animal study investigated the effects of chronic low-dose Roundup exposure on the gut microbiome composition of rats. Animals were exposed to Roundup in their drinking water at concentrations representative of human dietary exposure over a period of several months, with gut microbiome analysis performed at multiple time points.
The results demonstrated significant dysbiosis — disruption of the normal balance of gut bacteria — in Roundup-exposed animals. Beneficial bacterial species including Lactobacillus and Bifidobacterium were reduced, while potentially pathogenic species including Clostridium and certain gram-negative bacteria were increased. These changes are consistent with the known antimicrobial properties of glyphosate.
The gut dysbiosis was accompanied by increased intestinal permeability ('leaky gut'), elevated inflammatory markers in the gut tissue, and altered short-chain fatty acid production — changes that are associated with numerous chronic diseases in humans.
Key Findings
- •Chronic low-dose Roundup exposure caused significant gut microbiome dysbiosis in rats.
- •Beneficial bacteria (Lactobacillus, Bifidobacterium) were reduced while potentially pathogenic species increased.
- •Intestinal permeability ('leaky gut') increased in Roundup-exposed animals.
- •Inflammatory markers were elevated in gut tissue, indicating chronic intestinal inflammation.
- •Short-chain fatty acid production was altered, suggesting impaired gut barrier function and immune regulation.
Methodology
Sprague-Dawley rats received Roundup in drinking water at the U.S. EPA reference dose (1.75 mg/kg/day) for 13 weeks. Gut microbiome composition was assessed using 16S rRNA gene sequencing of fecal samples collected weekly. Intestinal permeability was measured using the FITC-dextran assay. Gut tissue was analyzed for inflammatory cytokines (TNF-alpha, IL-6, IL-1beta) via ELISA. Short-chain fatty acids were measured by gas chromatography.
Why This Matters for Families
The gut microbiome is increasingly recognized as central to overall health, influencing immune function, mental health, metabolism, and disease risk. This study shows that Roundup at everyday exposure levels disrupts the gut microbiome in ways associated with chronic disease. Supporting gut health through organic food, probiotics, and fermented foods is an important strategy for families.
Original Source
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