Carrageenan, protein digestion and gut lining cells in lab tests
What it found
In lab tests, carrageenan slowed down the breakdown of proteins and disrupted the barrier function of human gut lining cells.
It also raised a marker linked to inflammation in those cells.
What they found
Animal and lab studies
Slower protein digestion
In a lab digestion model, mixing carrageenan with milk, soy or egg proteins changed how they broke down. It caused a large drop in the activity of pepsin, a key stomach enzyme.
Gut barrier disruption
Digested carrageenan at 0.005 to 0.5 mg/mL affected the barrier function of human gut lining cells in a lab dish. It moved a key sealing protein called Zo-1, changed cell shape and let larger molecules pass through more easily.
Raised inflammation marker
Digested carrageenan increased levels of a receptor called CXCR1 in human gut lining cells in a lab dish. This receptor is linked to inflammation.
What the authors conclude
- They suggest carrageenan might lower the amount of protein the body can use from food.
- They say it could disrupt normal gut lining function and encourage intestinal inflammation.
- They conclude these effects might compromise consumer health.
How it was done
The authors wanted to look at two ways commercial carrageenan might affect health. They focused on how it changes stomach protein digestion and how it affects the structure and function of the gut lining.
They mixed three types of carrageenan with milk, soy or egg proteins and ran them through a model of human digestion. They then applied digested carrageenan at levels from 0.005 to 0.5 mg/mL to human gut lining cells grown in a lab dish.
What it can’t tell you
- We summarised it from the abstract only.
- These are lab tests using isolated proteins and cells in dishes.
- They cannot show what happens when people eat foods containing carrageenan.
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 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error