Ingredient to Watch: Carrageenan
In our galley, we keep a close eye on what goes into our food—and carrageenan is one of those ingredients we avoid completely. While it might sound harmless (it’s derived from red seaweed), carrageenan is far from a natural choice once it’s processed and added to our everyday foods.
What Is Carrageenan?
Carrageenan is a food additive made from red seaweed. It’s commonly used as a thickener, emulsifier, or stabilizer in processed foods. You can find it in everything from non-dairy milks and whipped toppings to deli meats, yogurts, and even some ice creams.
But just because it’s “from seaweed” doesn’t make it safe. The seaweed undergoes a harsh chemical process to extract carrageenan: it’s treated with strong alkaline solvents like sodium hydroxide (lye), then washed, heated, and filtered to create the final additive used in food. While this may yield a smooth, shelf-stable ingredient, it transforms the original seaweed into a highly processed substance with no nutritional value and potentially harmful side effects.
Why We Avoid It
Carrageenan has been shown in animal and lab studies to cause:
Gut inflammation
Bloating and digestive distress
Immune responses that mimic food poisoning
And if that weren’t enough, degraded carrageenan (which can form during digestion or food processing) has been linked to:
Ulcers and intestinal lesions
Tumor growth
Colon cancer in animal studies
Research has also indicated that carrageenan may provoke an inflammatory response in the human body. Animal studies have shown that its consumption can lead to significant inflammation and could potentially play a role in the development of chronic diseases, such as diabetes and heart disease. Chronic inflammation is increasingly recognized as a contributing factor to various health issues, including obesity and cancer.
Potential Link to Gut Health Disruption
Recent research suggests that carrageenan may disrupt the gut microbiota—the colony of microorganisms living in our intestines that play a crucial role in overall health. A healthy gut microbiome is vital for digestion, metabolism, and immune function. Disruptions to this ecosystem can lead to a cascade of health problems, affecting everything from weight management to mental health.
Impact on Nutrient Absorption
Some studies have raised concerns that carrageenan could interfere with the absorption of nutrients in the digestive system. If your body struggles to effectively absorb essential vitamins and minerals, it could lead to deficiencies that can have serious long-term consequences for your health.
Especially Harmful for IBS & IBD
If you or someone you love lives with IBS or IBD, carrageenan can make things much worse. It’s been shown to trigger flare-ups, increase inflammation, and irritate the gut lining. Many GI specialists now recommend that people with gut conditions avoid it altogether.
Why Is It Still in Food?
Simply put: it’s cheap. Carrageenan helps give products that creamy, thick texture we associate with indulgence—without actually using cream, fat, or more expensive whole ingredients.
But the cost to your health? Not worth it.
The Bottom Line
Just because something is approved for use doesn’t mean it’s good for you. Carrageenan is one of those ingredients we steer clear of in our galley, and I encourage you to do the same.
Real food shouldn’t come with a side of science experiments.
