Robert Wagner, Janine Buettner, Martin Heni, Louise Fritsche, Stephanie Kullmann, Moritz Wagmüller, Andreas Peter, Hubert Preissl, Jürgen Machann, Reiner Jumpertz von Schwartzenberg, Andreas L. Birkenfeld, Ulrich-Frank Pape, Gerrit van Hall, Peter Plomgaard, Hans-Ulrich Häring, Andreas Fritsche, Kelsey N. Thompson, Reinhild Klein, and Norbert Stefan

A new study has investigated the effects of carrageenan, a food additive commonly found in processed foods like ice cream, yogurt, and processed meats, on gut health and metabolism. Carrageenan is widely used to improve food texture, but concerns about its potential health impacts have been growing.

The study, which involved healthy young men, found that short-term carrageenan intake did not significantly impact overall insulin sensitivity, a key factor in blood sugar regulation. However, it did reveal some concerning effects, particularly for individuals with higher body weight. Carrageenan increased gut permeability (commonly referred to as “leaky gut”) and raised levels of inflammation-related markers in the body. These changes are known to contribute to long-term health issues such as insulin resistance, type 2 diabetes, and chronic inflammation.

Additionally, the study showed that carrageenan could activate certain immune cells and trigger the release of inflammatory cytokines in laboratory tests. While no major changes in gut bacteria were observed, the findings suggest that carrageenan may interact with the gut in ways that disrupt its natural barrier and immune function.

The researchers emphasized that more studies are needed, particularly in populations at higher risk for metabolic disorders, to better understand the long-term health effects of carrageenan. In the meantime, they recommend caution with processed foods that include this additive, especially for individuals who may already be prone to inflammation or metabolic conditions.