A google search will produce several sites that talk about the negatives of both these ingredients. Here are a two:Whatâ€™s this ingredient in my petâ€™s food? Carrageenan?
In â€œReview of harmful gastrointestinal effects of carrageenan in animal experimentsâ€ By J. K. Tobacman from the College of Medicine, University of Iowa, carrageenan doesnâ€™t get a very good (safe) review. â€œReview of these data demonstrated that exposure to undegraded as well as to degraded carrageenan was associated with the occurrence of intestinal ulcerations and neoplasms.â€ In 1972 the FDA â€œconsidered restricting dietary carrageenan â€¦this resolution did not prevail, and no subsequent regulation has restricted use.â€ In 1982 the International Agency for Research on Cancer identified â€œsufficient evidence for the carcinogenicity of degraded carrageenan in animals to regard it as posing a carcinogenic risk to humans.â€
From the International Agency for Research on Cancer, carrageenan is rated â€œ2B: Possibly carcinogenic to humansâ€. http://monographs.iarc.fr/ENG/Classi...AlphaOrder.pdf
Carrageenan: If you or your pet has problems with acid reflux, you can bet the chances are you have carrageenan somewhere in the ingredient lists of the foods you eat. Acid reflux could happen if your cat throws up clear liquid or anything more concrete without a lot of heaving before it is expelled from the mouth. There were online resources on this a few years ago, that seem to be absent at the moment, but I am researching to find more. The big concern here, to my mind, is that with repeated exposure to acid reflux, the esophagus becomes vulnerable to disease because the tissues are weakened. There are definite online resources regarding the coating of the stomach by carrageenan, and this reference also looks into other serious problems for humans, and in particular, infants. A good site showing scientific concern around feeding carrageenan to pets is at Review of Harmful Gastrointestinal Effects of Carrageenan in Animal Experiments. You may find the information helpful to members of your human family as well. When reading through the above site, I noticed that IBS is also being attributed to the inclusion of carrageenan in pet foods, which is new for me. Carrageenan Induces Interleukin-8 Production through Distinct Bcl10 Pathway in Normal Human Colonic Epithelial Cells does tend to confirm this for humans, too. This study was just reinforced with information published in March 2008, Carrageenan Induces Cell Cycle Arrest in Human Intestinal Epithelial Cells in Vitro1. There is also a study regarding the effect upon mammary cancer, just to name a few cautions here.
Guar Gum: The use of guar gum in canned foods has been shown to reduce the bioavailability of proteins, as in the following study: "Guar gum, a soluble nonstarch polysaccharide (NSP), is a common ingredient in canned cat foods and has been shown to decrease the digestibility of protein in diets for cats (Harper and Siever-Kelly, 1997).
However, these ingredients are pretty ubiquitous in canned pet food products, as they are fairly cheap, easy to use thickeners that allow the pet food industry to create products with "meat analog chunks" (their words, not mine Ways to reduce costs in wet petfood
); trying to avoid them is not really worth the effort, as there are very few - if any - canned food products that don't contain these or other "questionable" ingredients.
If you really want simple, healthy-for-the-cat foods, Space1101 (which your last few posts would seem to indicate), I'd advise you to investigate commercial raw products like Nature's Variety Instinct
, Feline's Pride
and Rad Cat
. Because these raw foods are minimally processed and immediately frozen, minimal supplementation is needed and no palatability, texture and / or visual "improvement" substances are added.
Whether it's because canned products contain too many additives, not enough supplementation to off-set the processing they undergo, or a combination of both, the difference in the health and energy of a canned fed (even "top-of-the-line" canned fed) cat and a raw fed cat is off the charts noticeable barely a week after making the switch.
I've seen it over and over myself, but you can also review CatCentric.org for supporting information and links.