These Ingredients Aren't Bad Enough to be Rejected, but I do Reduce Their Letter Grades

Next, I don’t reject them, but I reduce any product by one letter-grade rating (A through E) should the product contain: 

• major protein combinations, i.e. the mix of different, broad food ingredients within the same product (like meat combined in the same can with fish). Now, admittedly, this is more of my own personal preference rather than some scientific fact. One could think... I eat surf & turf (meat & fish), why can't my cat eat it? Imagine if you took your surf & turf and ground it all up and dumped it onto a dinner plate. Not as appetizing now is it? Said another way, I prefer only foods of ‘single-sourced’ products - only seafood , or only poultry, or only meat. I guess my point is that there are plenty of other cat food products to choose from without mixing major protein combinations. --  (While I’m on the subject, many cat food can labels are simply deceiving. For example, you might think a food called “Salmon & Trout Formula” would be good for your cat. Problem is, the first ingredient in the can is chicken. How about a product called "Real Beef Recipe"? The first ingredients are chicken broth and chicken. These are true, real-life examples that are on store shelves right now.)
• liver. Liver is a heavily disputed cat food ingredient. Some people believe the liver has many beneficial properties, while I, and many others, think that there is no way to separate the liver from the liver contents. The liver’s purpose is to filter toxic materials and protect the body. As far as I am concerned, if you feed your cat(s) liver, you feed your cat(s) toxins.  --  Listen very carefully when Dr. Justin Shmalberg of NomNomNow talks about liver in this video Why Doesn't NomNomNow Use Organ Meats?  ---  There's also another devious practice by unscrupulous cat food manufacturers using the word 'liver.' They don't always tell you what kind of 'liver' is in the can. You're reading down the list on a can of seafood... "Whitefish, Salmon, Fish Broth, Liver, etc., etc." You make the assumption that the 'Liver' is from a fish. WRONG - Not necessarily so. --- Having said that, it's almost impossible to avoid liver. It's in 53% of the products I have reviewed.  (Back to Ratings - A Quick Look page)
• clams, mussels & squid (I don't think I want to feed my cats anything that lives at the sea bottom and filters toxins for a living. Besides that, have you ever seen a cat in the wild go diving for exotic seafood?)
• dried egg product, dried egg whites (potential allergens)
• salt (I wonder why manufacturer's feel that added salt is a necessary ingredient in cat food. If salt is high on the ingredients list it may be of greater quantity than many of the important vitamins, minerals, etc.)

One of the greatest myths out there is that somehow fish is a better food for cats than is meat. Cats didn't evolve historically by fishing in a mountain stream or by going for a day's cruise on the ocean. Fish would be a good food, but for the fact that it contains contaminants. Resultant health problems can occur with a predominantly fish based diet - problems associated with mercury toxicity and the fact that fish have alarming levels of toxins from swimming in polluted waters. It's best to use fish as a periodic supplement to beef or poultry meals, not as a dietary staple.

I also must inject a comment here about farmed fish. Some people believe farmed fish are superior to wild fish, but nothing is farther from the truth. Farmed fish are often 'fed' poultry feces when poultry is held in nets above the fish tanks.

As expressed elsewhere on this website, because of it's natural propensity for contamination, fish/seafood should not be used as a primary daily food. Feeding your cat(s) fish often/regularly is not a good idea. 

Writing for Feeding Fido and Fluffy, Carol North has just published an article titled 'What You Must Know About Fish-Based Cat Food.' This article, while zeroing in on the subject of fish in cat food, is also reflective of specific ingredients in all cat food. Read as Carol describes 'Contaminants in Fish that Could kill Your Pet.'

Here's a detailed article by Jean Hofve, DVM in Little Big Cat titled 'Why Fish is Dangerous for Cats.'  Again, I'm not saying don't feed cats fish. I'm saying don't have fish be the predominant meal in their diet.

Here's yet another message warning us to curtail our use of seafood. The article is Mercury in Fish-Based Cat Food: What You Should Know - from Ingrid King in The Conscious Cat