Chronic Xanthan Gum Alters Gut Microbiota and Colon Health

Key Points

• • Chronic xanthan gum consumption triggered colon inflammation and disrupted gut barrier integrity in a rat study.
  • Researchers observed increased inflammatory markers (IL-1β and TNF-α) and higher Claudin-2 expression, indicating impaired intestinal permeability.
  • The additive also altered the gut microbiota, promoting bacterial populations associated with inflammation.
  • Findings may explain previous reports linking xanthan gum-containing thickeners to necrotizing enterocolitis in premature infants.
  • Researchers emphasize that human translational studies are needed before changing dietary recommendations for the general population.
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Chronic Xanthan Gum Consumption Linked to Colon Inflammation in Study

Food additive Chronic xanthan gum, commonly found in processed foods, protein shakes, and dysphagia thickeners, may contribute to intestinal inflammation when consumed over an extended period, according to a new experimental study published in PLOS One. Researchers from the Federal University of São Paulo (UNIFESP), Brazil, found that chronic xanthan gum intake triggered colon inflammation, disrupted intestinal barrier function, and altered gut microbial balance in rats. The findings provide new mechanistic evidence that may help explain earlier clinical observations linking xanthan gum to severe intestinal complications in premature infants.

Although the research was conducted in animals, investigators caution that the findings warrant further translational studies to better understand the long-term health effects of regular xanthan gum consumption in humans, particularly among vulnerable patient populations.

How Does Chronic Xanthan Gum Consumption Affect Gut Health?

Researchers fed rats diets containing xanthan gum for 10 weeks and evaluated inflammatory, histological, and microbiological changes in the colon. The study demonstrated a dose-dependent increase in inflammatory cell infiltration within intestinal tissue, particularly among animals receiving moderate and high concentrations of the additive.

The investigators also identified increased expression of Claudin-2, a protein that regulates intestinal permeability. Higher Claudin-2 levels indicated weakened intestinal barrier integrity, allowing inflammatory pathways to become activated. Consistent with this finding, researchers measured elevated concentrations of the pro-inflammatory cytokines IL-1β and TNF-α, both of which are associated with intestinal epithelial injury and chronic inflammatory bowel conditions.

Key Takeaway for HCPs

The study suggests that prolonged xanthan gum exposure may contribute to intestinal barrier dysfunction, chronic inflammation, and altered immune responses through increased gut permeability.

Gut Microbiota Changes and Clinical Implications

Beyond inflammation, chronic xanthan gum consumption also modified the composition of the gut microbiota. While overall bacterial diversity remained relatively stable, researchers observed an increase in bacteria belonging to the Elusimicrobiota phylum, a microbial group previously associated with inflammatory states and gut dysbiosis.

The findings also offer biological support for earlier reports involving necrotizing enterocolitis (NEC) in premature infants. In 2012, multiple NEC cases were reported in premature newborns receiving xanthan gum-thickened formula, prompting the U.S. FDA to advise against its use in infants. The current experimental model provides mechanistic evidence linking xanthan gum exposure with intestinal inflammation and compromised barrier function.

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Researchers emphasize that the results should not be interpreted as evidence that occasional dietary xanthan gum intake is harmful. Instead, they highlight the need for carefully designed human studies to evaluate cumulative exposure, particularly in individuals who rely on xanthan gum-based thickeners for dysphagia management. Monitoring gastrointestinal health and considering supportive strategies, such as probiotics where clinically appropriate, may be beneficial for selected patients while additional evidence continues to emerge.

Source:

São Paulo Research Foundation (FAPESP)