Scientists Discover Why Red Meat May Worsen Intestinal Inflammation

A new study suggests that the source of dietary protein may significantly influence the severity of inflammatory bowel disease (IBD). Research published in the journal Cellular and Molecular Gastroenterology and Hepatology found that a diet rich in beef protein worsened intestinal inflammation in animal models, while pea protein was associated with a milder course of disease.

Inflammatory bowel diseases, including Crohn's Disease and Ulcerative Colitis, have become increasingly common in the United States and many other countries in recent decades. During the same period, consumption of animal protein—particularly red meat—has also increased. Previous studies had linked higher red meat intake to a greater risk of IBD flare-ups, but the biological mechanisms behind this association remained poorly understood.

In the new study, researchers compared the effects of several protein sources—including beef, eggs, dairy products, soy, and peas—on intestinal inflammation in multiple mouse models of IBD.

The results were consistent across experiments. Mice fed diets containing beef protein developed the most severe intestinal inflammation, whereas those receiving pea protein experienced the mildest symptoms.

The researchers noted that the findings were independent of the animals’ sex and were reproduced in different experimental models, strengthening confidence in the observations.

According to the study, the differences in disease severity appear to be linked to the way gut microorganisms interact with the intestinal barrier and bile acid metabolism. These biological processes can either promote inflammation or help protect the intestinal lining from damage.

The authors suggest that the source of protein—not merely the total amount consumed—may play a critical role in regulating inflammatory activity within the gut.

While the research was conducted in animal models and cannot be directly applied to humans, the findings may help scientists develop more precise dietary recommendations for people with inflammatory bowel diseases. The study also provides new insight into how nutrition can influence the progression and severity of chronic intestinal inflammation.

The researchers emphasize that further human studies will be needed to determine whether replacing certain animal proteins with plant-based alternatives could help reduce inflammation and improve outcomes in patients with IBD.

Follow NEWS.am Medicine on Facebook and Twitter