Carrageenan and digestion in lab tests
What it found
In lab tests, carrageenan interfered with the breakdown of milk, soy and egg proteins and affected gut cell function.
The work used a digestion model and Caco-2 cells, not people.
What they found
Animal and lab studies
Protein breakdown
The carrageenan samples interfered with the breakdown of proteins in the lab digestion model, and pepsin activity dropped significantly.
Gut barrier function
Digested carrageenan affected the barrier function of Caco-2 cells, including a redistribution of the tight-junction protein Zonula Occludens-1 and changes in the cells' F-actin architecture.
Leaky cell layer
The cell layer became more permeable, letting more large molecules pass through.
Inflammation signal
Digested carrageenan raised levels of the IL-8 receptor CXCR1, which is involved in inflammation.
What the authors conclude
“This work raises the possibility that CGN may reduce protein and peptide bioaccessibility, disrupt normal epithelial function, promote intestinal inflammation, and consequently compromise consumer health.”
Also in their conclusions
- They say the work raises the possibility that carrageenan may reduce protein and peptide bioaccessibility, disrupt normal epithelial function, promote intestinal inflammation, and consequently compromise consumer health.
How it was done
The authors wanted to look at two ways carrageenan might affect human health: by changing how proteins are broken down in the stomach, and by affecting the structure and function of gut cells.
Three commercial carrageenan samples were mixed with milk, soy or egg protein isolates and put through a semi-dynamic lab digestion model. A Caco-2 cell model was then used to test the effects of the digested carrageenan on gut epithelial cells.
What it can’t tell you
- We summarised it from the abstract only.
- These are lab tests using a digestion model and Caco-2 cells, not people. They can't show what happens in the human gut.
- The study did not measure health outcomes in people, so it can't show whether carrageenan causes digestive problems or inflammation in real life.
Who paid
- Authors work at
- Technion - Israel Institute of Technology, Israel; Pediatric Gastroenterology & Nutrition Institution, Israel; Rambam Medical Center, Israel
The paper
- Title
- Digestive fate of dietary carrageenan: Evidence of interference with digestive proteolysis and disruption of gut epithelial function
- Type
- Study
- Evidence
- Animals and lab studies
- Summarised from
- Abstract only
- Cite
- Fahoum L, Moscovici A, David S, et al (2017). Digestive fate of dietary carrageenan: Evidence of interference with digestive proteolysis and disruption of gut epithelial function. Molecular nutrition & food research. doi:10.1002/mnfr.201600545PubMed 27718308DOI
Summary written 26 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error