Someone else here is very leery about carrageenan, though I don't remember who. It's not something that bothers me - I've always felt that if they were to do tests on every food we ingest, invariably they'd find something that was bad for us in each one. But I have noticed that it's in an awful lot of better quality wet foods.
If carrageenan comes from seaweed, it would surprise me that it's bad healthwise, unless it's in the way it's processed, or what particular seaweed. Seaweed's supposed to be very healthy, isn't it?
i am but there are probably more. my older cat seems to have sensitivities that make her vomit. the vet suspected IBD but i haven't gone through any of the endoscopy/expensive invasive testing, i just opted to experiment with diet first.
this is just an unfounded suspicion i have, not being able to conduct chemistry experiments on the food, but i think it could also have something to do with palatibility. all canned cat food has something to make it taste better, except for the completely bare bones stuff.
it's the way it's processed. i can't remember all the chemical procedures, but kind of like splenda is sucralose which is just chlorinated sucrose, the body doesn't metabolize it so it's non-caloric. however, the debate is whether chlorinated sugar is more harmful to the body than sugar if you're diabetic, and is stevia (truvia) the best alternative. (or none at all.)
carrageenan is not only used for coloring as well as a thickening agent like guar gum. it's also used in vegan or kosher food that requires no animal-based gelatin. carrageenan has been found to cause cancer in some lab animals although i suspect that's at very high levels. it does cause gastric upset in slightly higher percentages, and since my cat has a sensitive digestive tract, i try to avoid it just to be on the safe side.
i'm not sure why it's in so much of the higher end foods, i found that a little strange. it isn't in a lot of the weruva or tiki cat, nor is it in hound & gatos (which i think probably has a high level of fat) but it is in b.f.f. and wellness.