Food Additive in Your Yogurt Linked to Cancer

+ Pamela Friedman

YogurtThere are a number of food additives you may want to avoid because they could potentially harm your health. Artificial colorings, some preservatives like BHT, plasticizers like BPA, and the like are linked to things like hormone disruption, cancer, and hypersensitivity in children.

Some food additives, however, are not so clear-cut. Take carrageenan, for instance. Is this ingredient something you should avoid, too?

What is Carrageenan?

What confuses a lot of people is that carrageenan is extracted from red seaweed, which is commonly known as “Irish moss.” Seaweed is supposed to be good for you, right?

Used as a thickener and emulsifier, carrageenan is used in creamy foods like ice cream, chocolate milk, yogurt, cottage cheese, soymilk, and other similar items. There are two main types:

  • Refined: To make refined carrageenan, workers cook the seaweed in an alkaline solution, then filter out the solid parts. The remaining liquid is then concentrated to remove and dry the carrageenan.
  • Semi-refined: To make semi-refined carrageenan, the seaweed is cooked in an alkaline solution that contains potassium hydroxide. This prevents the carrageenan from dissolving into the solution, so it’s easier to pull it out later. Once the seaweed is removed, what’s left is carrageenan and cellulose, which is ground into a powder.

What are the Concerns?

The concerns with this ingredient started about a decade ago when scientists reported that some degraded forms of carrageenan (not the kind used in food) had been linked to ulcerations and cancers of the gastrointestinal tract in animal studies.

A prominent researcher in the field, Joanne K. Tobacman, M.D., now associate professor of the University of Illinois College of Medicine, conducted a number of studies on the type of carrageenan that is used in foods. She ended up publishing 18 peer-reviewed studies on the additive, and has concluded that it is not good for human health. In April 2012, she addressed the National Organic Standards Board and urged reconsideration on the use of carrageenan in organic foods.

Dr. Tabocman made a similar recommendation in a 2001 study, in which she noted the association between exposure to carrageenan in animals and gastrointestinal problems. “Because of the acknowledged carcinogenic properties of degraded carrageenan in animal models,” she wrote, “and the cancer-promoting effects of undegraded carrageenan in experimental models, the widespread use of carrageenan in the Western diet should be reconsidered.”

According to the University of California, Berkeley, several lab studies (mostly Tobacman’s) have shown that both food grade and degraded carrageenan can cause inflammation and increased cell death in human colon cells. Since these results came from animal studies, however, some scientists dispute the findings, saying they might not hold up in human studies, which are so far lacking.

Trying for Change

In 2008, Dr. Tacobman filed a citizen petition with the FDA, presenting the results of her studies, but the FDA rejected the petition, disagreeing with Tacobman that the studies indicated the additive was dangerous for humans.

Other experts disagree, however. Europe has already banned carrageenan in infant formula. On March 15, 2013, the Cornucopia Institute sent a letter to the FDA, requesting the agency reconsider their decision on Dr. Tobacman’s petition to remove carrageenan from the agency’s list of approved food additives.

So far, however, it remains up to consumers to protect themselves from this potentially harmful additive. Try these tips:

  • Read labels and avoid carrageenan.
  • Look for safer alternatives, which include guar, locust bean, and xanthan gum.
  • Buy things like yogurt and chocolate milk from brands that don’t use carrageenan, including Stonyfield Farm, Eden Foods, and Tofu Shop Specialty Foods.
  • Check this web page for a shopping guide for avoiding organic foods with carrageenan, put out by the Cornucopia Institute.

Do you try to avoid carrageenan? Please share your thoughts.

Picture courtesy Apolonia via


J. K. Tobacman, “Review of harmful gastrointestinal effects of carrageenan in animal experiments,” Environ Health Perspect, 2001 October; 109(10):983-994,

Lynn Buske, “New Report: Food Additive (Carrageenan) Suspected in GI Disease/Tumors-FDA asked to pull from Market,” The Cornucopia Institute, March 18, 2013,

No Comments