Cat Food Ingredients to Avoid
Know What Is In Your Cat’s Food
Educating yourself about healthy nutrition for your cat may seem daunting, but it doesn’t need to be. One of the best ways to begin is learning how to read pet food labels, so you can avoid the ingredients harmful to your cat’s health.
A good cat food is made from whole food ingredients, including named meats (e.g., turkey not poultry meal), healthy oils and vitamins. But most cheap commercial diets contain things your cat shouldn’t be eating, such as by-products, corn, soy, unnamed meat and fish or grain meals, rendered fat, as well as artificial preservatives, flavors and coloring. Our goal is to show you how to spot these ingredients so you can put the product back on the shelf.
Now let’s look closer at some of the ingredients to avoid.
General Information
The Significance of “Human Grade” Ingredients in Pet Food
The term human grade in pet food means the finished product is legally suitable and approved as nourishment for humans. It is “edible.” Human foods are much more rigorously regulated than foods made for animals. Unlike the loosely controlled pet food industry, the FDA and USDA regulate human foods and conduct frequent, detailed inspections of the manufacturing facilities that produce food for people. Only pet foods made in human grade facilities, subject to the inspections and approval necessary to have human grade status, can be legally considered 100 percent “human grade”.
The Opposite of Human Grade is “Feed Grade”
In contrast to human grade pet food, “feed grade” is finished product unsuitable for human consumption (“inedible”). It can only be legally fed to animals (other than humans). Feed-grade ingredients are essentially waste products of the human food industry. The bulk of these ingredients are rendered by-products derived from:
- Meat slaughtering and processing plants
- Dead animals from farms, ranches, feedlots, marketing barns, animal shelters, and other facilities
- Fats, grease, and other food waste from restaurants and stores
Feed-Grade Ingredients Cooked at Nutrient-Destroying Temperatures
Unfortunately for our pets, nearly all commercially available dog and cat food is made with ingredients considered to be feed-grade instead of human-grade. However, there are more and more companies produces higher quality pet foods now using human-grade ingredients you just have to be savvy about searching them out.
Made in the USA
AAFCO established regulations for “Made in the USA” state…all significant parts and processing that go into the product must be of US origin. That is, the product should contain no – or negligible – foreign content. So just putting together ingredients inside the US is not enough. Additionally, just getting ingredients from a broker within the US is not enough.
Beware of Food Manufactured & Ingredients Sourced Outside the USA
- The problem with Chinese ingredients hasn’t gone away
- Where the cat food is manufactured also makes a difference
- Only trust transparent pet food manufacturers
You can source the best cat food ingredients from the safest parts of the world, but it’s also extremely important how they are prepared into a diet. “A pet food company that uses their own facilities versus co-manufacturing or manufacturing off-site allows for better quality control as it relates to ingredient sources and processes,” Mindy Bough, head of the ASPCA’s Pet Nutrition Services says. This is because pet food companies that use their own manufacturing facilities are able to set higher quality control standards (e.g., isolating raw ingredients from contact with dry products) and are better equipped to deal with quality control issues more quickly. Look for a label or statement on your cat’s food stating that it was “manufactured by” (instead of “manufactured for” or “distributed by”).
Pet food manufacturers should not be afraid to answer your questions, least of all a manufacturer that uses a “Made in the USA” label on its pet food. Who formulates your diets, and what are their credentials? Where are your diets produced and manufactured, and can this plant be visited? These are just some of the questions you should be prepared to ask a pet food company you are currently buying from or are considering buying from.
Reading Labels Before You Buy
If you make it a habit to read the ingredient label before purchasing cat food, there are things to look for and things to avoid. To help point the way to the healthier types of quality cat food, experts and advocates say there are ingredients to avoid. These are chemical preservatives, meat by-products, carbohydrate fillers, sweeteners, rendered fats and artificial colors and flavors.
You are what you eat. So are your cats.
Our experience is that much illness can be prevented and/or healed with proper feline nutrition. This is not a substitute for proper medical care but a partner in your cat’s health.
Cats are obligate carnivores. This means they must have meat to survive, unlike the omnivorous dog, who can survive on a wider variety of food.
Another difference is that cats have a relatively short digestive tract with a smaller stomach, compared to dogs (and humans). Cats’ livers are also lighter and much more simple than dogs, having evolved for lots of travel while hunting. Because they lack essential enzymes and amino acids, they simply don’t have the capacity to digest other food sources, like vegetable matter or fruit.
Your cat’s health depends on eating feline-appropriate ingredients in its food. The ideal diet for a cat is a mouse, which has around 55% protein and 23% fat. While there are sources for whole frozen mice to feed your cat, most people aren’t up to that task and rely on commercial or homemade cat food. It’s also just as important that your cat not be exposed to cat-inappropriate ingredients that may be toxic for it in the long run.
There is no consensus, either in the veterinary world or the pet consumer world, on whether to feed wet food, dry food, or homemade food. This is a choice best left to you and your lifestyle as your cat’s guardian.
As the 2007 pet food recalls showed us, even the most premium pet food brands have been known to put questionable ingredients in their food. It’s up to us to become well-informed consumers and choose the best food to keep our cats and kittens healthy.
We’ve drawn on the best research we can find for this article. We offer some parameters for what to look for in your cat’s food and what to avoid. Please see our article What Should I Feed My Cat for more specific recommendations. Feel free to contact us if you have any other information regarding any of these ingredients. We’re always open for new information!
PROTEIN
According to the AAFCO, adult cats can survive on 26% protein, while kittens and lactating queens need 30%. However, a mouse is around 55% protein, so a higher protein content will enable them to thrive, not just survive.
While the AAFCO definition of “by-product” can contain good ingredients such as clean internal organs, pet food manufacturers are also allowed to include everything from sick slaughterhouse animals to euthanized animals to expired junk food. Since there is no consistency to the mix, it’s best to avoid this source.
Look for whole sources of protein, like whole chicken, turkey, eggs or fish. The best sources are from animals the cat could conceivably kill, with amino acid ratios appropriate to feline kidneys. This means chickens, turkeys and other small birds with occasional eggs and fish.
“Meal” means the fat and water of the protein have been removed and is usually a satisfactory source of protein, since it’s more concentrated, but make sure the animal is specified (e.g., “chicken meal” not “poultry meal” or “salmon meal” not “fish meal”).
What to Avoid
- Any non-specific meat: especially “by-products” which can contain any form of animal matter (i.e., skin, fur, organs, etc.) and residual matter from processing which are unhealthy choices
- Meat by-products: especially as the initial meat ingredient, avoid to ensure good long term health
FAT
While the AAFCO puts minimum fat needs at 9%, a mouse would be around 23%. 15% fat is a good compromise. The fat source should be from a specific animal.
What to Avoid
- Beef tallow: a cheap and undigestible fat source for cats
- “Animal fat”: the fat from rendering questionable sources of protein, which can include euthanized animals and the drugs used to kill them with, among other toxins
- Vegetable fats like flax and safflower oil: cats can’t convert this to the appropriate fatty acid
GRAINS/CARBOHYDRATES
A cat’s natural prey like the mouse would be around 3% carbohydrates. Cats actually have little metabolic need for carbohydrates and no way to convert carbs to energy, the way dogs and humans can. Grains are added to dry kibble to make it easier to handle for humans. The most appropriate grain for cats, according to research, is rice, and the most appropriate form for rice is rice bran. It should come after the protein sources in the list of ingredients.
What to Avoid
- Wheat and soy: a known allergens for cats
- Wheat fiber: a known irritant for cats
- Corn: proven to have more bioavailable protein than other grains, but still less appropriate than meat sources
NOTE: Corn and soy also have a very good chance of being contaminated with genetic modification (GM). Some estimate up to 80% of non-organic corn crops have been genetically modified. None of these GM crops have even been studied in the long run for their affect on humans, much less on cats. Unless you want yourself and your pets to be unpaid research subjects for corporate agriculture, you might want to avoid these products.
- Potatoes and sweet potatoes: there is presently no published research on the effects on cats of newer carbohydrate additives such as potatoes or sweet potatoes. Until the manufacturers can show proof these ingredients are safe, it’s probably best to avoid them
- Gluten: many formulas have gluten as a source of carbohydrates as well as protein. Gluten was proven to be a risky ingredient imported from China in the form of melamine during the 2007 pet food recalls that killed millions of companion animals
FIBER
Up to 90% of the immune system response lies in the intestine. Fiber plays a huge role in making sure the intestine is healthy. Rice bran and beet fiber have proven to be good sources of fiber for felines in that they provide the fermentability for good bacteria as well as not lowering the digestibility of the rest of the food.
What to Avoid
- Cellulose: the least fermentable fiber for felines. This may push the food through too quickly for proper nutrients to be absorbed.
- Oat fiber, peanut hulls, psyllium gum, soy hulls, citrus pulp and lactulose are also not fermentable by cats, according to research, acting like cellulose in the gut.
- Fructooligosaccharides (FOS), guar gum, locust bean gum and citrus pectin are actually too high in fermentability and can cause gas, diarrhea and loss of nutrients.
- Peas & pea fiber: another inexpensive filler and highly insoluble. Note there is zero research available on its effect on cats.
- Alfalfa meal: It is high in protein but proteins derived from plants don’t contain all the amino acids your carnivorous cat requires. That’s why cats require meat-based nutrition — the protein in animal tissue provides a complete amino acid profile. Also, like soy, alfalfa contains phytoestrogens, which are plant estrogens that are well-documented endocrine disruptors. Furthermore, alfalfa contains several saponins, which are glycosides with a foaming characteristic. Saponins are anti-nutrients, meaning they interfere with absorption of essential nutrients.
VITAMINS & MINERALS
Cats need most of the same vitamins and minerals that dogs do, with the following exceptions. Cats need more Vitamin A than dogs because they can’t convert beta carotene. They also need twice the amount of B Vitamins: (Thiamine, Riboflavin, Pyridoxine, Pantothenic Acid, Niacin and B-12). Most commercially prepared diets contain the recommended amounts of vitamins and minerals for cats and it can be dangerous to supplement past minimum requirements.
What to Avoid
- Vitamin K3, otherwise known as Menadione or Menadione Sodium Bisulfite or Bisulphate: a cheap and artificial form of Vitamin K that causes many serious side effects. This is banned for human use here in the US as well as in Europe.
VEGETABLES & FRUITS
A vet once said that if cranberries were good enough for him, they were good enough for his cat. Based on that reasoning, he should be thriving on a primarily protein diet of mice, small birds, eggs and fish. That’s not the case, of course.
The only well-researched sources of vegetable nutrition for cats are pumpkin, rice bran and beet fiber. Many cat foods, especially higher-end ones, are marketed toward the human, not the cat. This leads to unresearched additives like tomatoes, blueberries, cranberries, potatoes, carrots, spinach, apples, zucchini…the list goes on. In addition, avocados have been found to be toxic to cats.
Cats suffer with less research funding than dogs have, so many of these ingredients have not been proven to be safe. Cats’ simpler livers lack certain enzymes and amino acids to process these ingredients which are exotic to the normal diet of cats. Until the pet food manufacturers can prove the safety of these ingredients, it’s simply unnecessary–and downright dangerous–to feed your cat food that has these in it.
What to Avoid
- Cranberries: a growth industry from overproduction of cranberries, with no research to guarantee either safety or health improvement, especially in cats. In fact, the benzoic acid of cranberries has been proven toxic to cats.
- Blueberries, apples, acai berries, tomatoes or any other fruit: no research to support their safety.
- Carrots, spinach, turnip greens, zucchini, green beans or any other vegetable but pumpkin: no research to support their safety.
- Avocadoes: all parts are toxic to animals and research says, “Feeding avocados to any non-human animal should be completely avoided.” (This is under debate but we are not willing to risk it on our cats.)
HERBS & HERBAL ADDITIVES
Again, cats’ livers cannot process many of the same things dogs can, so you should never assume the safety of exotic ingredients unless your pet food manufacturer can show you the research. Many herbal additives, such as yucca, alfalfa, green tea and parsley are included as enticements for the cats’ humans, with no proof of their safety for the cats themselves.
What to Avoid
- Yucca Schidigera Extract: purported to decrease the odor in feces, Yucca is on many lists of plants toxic to both dogs and cats.
- Rosemary Extract: cheap preservative known to cause seizures in cats and small dogs and not proven safe, either in the US or in Europe.
- Alfalfa, green tea, parsley, licorice root, angelica root, fenugreek, marigold, fennel, peppermint, chamomile, dandelion, savory, or any other herbs: no research to support their safety.
PRESERVATIVES
Mixed tocopherols (Vitamin E) have been proven to be safe and effective preservatives in cat and dog food. Recently, manufacturers have begun to add cheaper and more deadly preservatives to their formulas.
What to Avoid
- Ethoxyquin: actually a pesticide which may compromise your cat’s health over time.
- BHA & BHT: cheap chemical additives not proven to be safe.
THICKENERS
This is an odd category, but must be included for canned cat food, since almost all brands have some in them.
What to Avoid
- Carrageenan: a known cancer-causing substance for humans, it is also known to produce intestinal lesions, ulcerations and tumors in experimental animals. Can be avoided in some canned cat food.
- Guar Gum: shown to decrease the digestibility of protein in cat food. Very sticky substance that may cause canned food to stick more to cats’ teeth. Hard to avoid in canned food.
FOOD COLORING
Cats can only see minor variations in color, so any bright colors in food are put there for the humans, not for the food. No food coloring has proven to be safe for felines, so if your cat’s food isn’t meat colored, avoid it.
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