Essential Guide: Understanding Your Cat’s Food Diet

The Essential Guide to Cat Food diets: What you need to know

When admiring our serenely sleeping cats curled up cosily at the end of the bed it’s hard to rationalise that these beautiful elegant creatures who have become affectionate companions and confidants over the years are in reality lean, mean killing machines when it comes to their eating habits.

For most cat owners, the fact that we are actually harbouring a skilled assassin is something we would rather turn a blind eye to. However, the impressive features of a natural born predator are hard to deny; strong agile bodies with lightning reflexes, stealthy silent gait, razor sharp claws, long canine teeth, excellent night vision, highly attuned hearing and a superior sense of smell.

Acknowledging the glaringly obvious truth about these unique creatures we share our lives with is fundamental to understanding all aspects of their healthcare. So why does this often get forgotten when it comes to the most essential of topics – cat food nutrition!

What are you feeding your cat?

Vet’s Klinic Clinical Director and veterinary practitioner, Jenny Philip BVMS MRCVS, knows the importance of giving your cat a science based natural balanced diet, which gives them the nutrients they need to thrive knows first-hand how deficient some commercially prepared cat food brands can be from a nutritional point of view.

Currently 70% of UK cat owners feed a commercially prepared diet to their cat, of which half feed a mix of wet and dry cat food; the other 30% of owners feed table scraps, raw meat based diets or allow their cats to eat live prey.

Raw and live prey animal cat food diets are potentially very biologically appropriate. However, at home prepared diets are notoriously difficult to balance correctly and can be time consuming and inconvenient for most. Worryingly, a recent study in the US found 84% of these home prepared diets are deficient in multiple nutrients.

Even so, some commercially prepared cat food diet recipes are just as inappropriate; they may well balance better on paper but it only takes a glance at the back of a packet of some of these commercial cat foods to highlight their inadequacies.

For example, take the two best market leading dry cat food brands; the analytical constituents (this is the ingredients in the cat food) read 30-32% protein, 10% fat and 7.5-8.5% ash. What the manufacturer doesn’t need to declare is the carbohydrate content. Most of these dry diets are over 40% carbohydrate and rely on the carbohydrate to create the kibble structure. So why is a high carbohydrate content in a cats diet a concern?

Are Cats Carnivore or Omnivore?

Cats do not need a high carbohydrate diet, in fact it goes against their biological makeup

Cats are biologically different to us; they are classified as obligate carnivores. If you are a ‘Carnivore’ you derive your energy and nutrients from a diet exclusively or mainly from animal tissue. If you are an ‘Obligate Carnivore’ you depend solely on animal tissue as opposed to a facultative carnivore that, in the absence of meat, can choose to use non-animal sources for their nutritional requirements. In contrast, humans are classed as omnivores, deriving their energy from a variety of food sources, and dogs are a topic of controversy and can be classified as either omnivore or facultative carnivores.

The domestic cat’s natural diet consists of small rodents and mammals. On average a prey item is 62% animal derived protein, 10% fat with 14% ash, which is mainly mineral content from bone (see the table below).

Prey Species – Crude Protein% – Fat% – Ash%

  • Mouse – 62 – 11 – 13
  • Rat – 63 – 9 – 14
  • Small Bird – 62 – 9 – 15

This protein rich diet has caused obligate carnivores to evolve with completely different biochemical pathways for processing food and metabolising nutrients when compared to other species we are familiar with such as dogs or ourselves.

Cats Need Protein for Energy, Not Carbohydrates!

The universal source of energy to all cells in any creature is glucose. For humans and dogs glucose is readily available from breaking down the carbohydrate in our diets. However, for carnivores their diet of fat and protein requires them to obtain glucose in a different way. Hence cats have well developed pathways to convert the building blocks of protein, amino acids, into a source of glucose. These pathways exist in humans and dogs but they are part of a collection of pathways to create energy that can be altered dependent on the type of food ingested. For cats, even when a cat has not consumed any protein, their body cells still demand a source of amino acids for energy and, in the absence of dietary protein, they have to start utilising existing body protein, i.e. muscle mass, to maintain normal cell function.

Cats naturally in the wild would consume a high amount of protein in their diet, 62% if they consume a mouse. Comparing this with the commercial diet at 30% it doesn’t take an expert nutritionist to identify a massive discrepancy within their diet!

Don’t All Commercial Cat Foods Contain Protein?

Technically, commercially prepared cat food products do contain protein, but not all protein is created equal. The other important question that needs to be considered is where the protein originates from. Protein in a diet can come from animal tissue but is also found in many vegetables and grains. The only way of determining the source of protein is by analysing the composition (ingredient) list on the back of the packet. The list is ordered by weight in descending order, so to satisfy a cat’s biological requirements, a source of meat-based protein should be first on the list. For the two diets in our example the first three ingredients read: cereals, animal and meat derivatives (10%), vegetable protein extracts. Therefore, the protein declared in these diets is largely derived from non-animal sources. Other than the obvious fact that we have never witnessed a cat with a desire to stalk vegetables, why does this matter?

Cats Need Animal Protein for Health Reasons.

It matters because, cats require specific amino acids and vitamins in their diet, which are essential for normal cell function; some of these can only be obtained naturally from animal tissue. Arginine, Taurine, Cysteine and Methionine are amino acids used in lots of important processes in mammals but cats have to rely on a dietary source making them essential; this is not the case in dogs and humans as they can synthesis these molecules from others. For cats this process is not efficient and their daily requirements are much higher, consequently they utilise them faster than they can be created. Deficiencies can cause serious disease, for example taurine deficiency can cause heart disease and blindness. Commercial diets have to follow strict guidelines to ensure that these molecules are present in adequate amounts and in cases where levels are inadequate, the cat will need to take an artificial supplement to ensure they receive the right level of thee important vitamins and minerals. Surely the more logical and natural approach is simply to feed what the cat naturally requires- meat based protein!

How many of us have seen a black cat that has a reddish brown tinge to their coat?

This is something that many of us may have observed in passing without realising but is a classic example of the effects that a diet deficient in meat can have. Tyrosine is an amino acid only found in animal tissue that cats can’t synthesise themselves. However, it is not a necessity for body function and therefore is not a regulated requirement to be supplemented in commercial diets. Tyrosine is a key component of the pathway that creates melanin, the black pigments responsible for their coat colour; so in a deficient state a black cat turns brown.

Where is your cat’s protein coming from?

Even when animal protein is included in a diet the majority comes from rendered sources. Rendered meat or more commonly named ‘meal’ comes from animal tissue that has been heated for a prolonged time at extreme temperatures and pressures to remove the fat. Rendered meat is on average only 75% digestible. This means that for every 10g of rendered meat consumed only 7.5g can be utilised by the body. When you compare this to some of the new technologies using fresh meat as an ingredient, with 96% digestibility, this protein source certainly looks to be a more favourable ingredient. Furthermore, the carbohydrate content in commercially prepared cat food diets affects digestibility; the higher the carbohydrate content the less digestible the protein. There are several factors contributing to this but predominately carbohydrates accelerate gut transit hence reducing the time available to digest protein in the diet.

More importantly on this topic, as illustrated by the figures above, a cats natural diet does not contain large amounts of carbohydrate, therefore cats have evolved with a reduced ability to process and utilise carbohydrates.

Too many carbohydrates in commercial cat food can cause obesity in cats.

Specific molecules called enzymes carry out the process of breaking down food. Different enzymes are responsible for breaking down different types of food. Amylase is an enzyme responsible for carbohydrate breakdown; this is present in saliva and is then also secreted by the pancreas gland in both dogs and humans. Cats possess no salivary amylase and have very limited levels of pancreatic amylase so have reduced capacity to deal with this type of food.

Cats can process carbohydrate to some extent and once broken down they can use simple sugars very efficiently, however, they have limited ability to store them for future use. In a dog or human excess sugar is stored in the liver as a large chain of sugars in a molecule called glycogen; this can be readily broken down if the animal suddenly needs a source of energy. A cat’s biochemical pathways are not efficient at storing sugars in this way, instead any excess sugars are stored by converting them directly to fat which in turn predisposes cats to weight gain. This process is slower and can lead to prolonged periods of hyperglycaemia after eating. Both obesity and prolonged hyperglycaemia are key factors thought to contribute to the development of cat diabetes. Obesity itself is one of the greatest and growing health issues we face with our domestic felines; it is now estimated to affect 30% of the cat population. We all have a responsibility to reduce this growing health concern and this starts with diet awareness.

Although feeding high carbohydrate and vegetable based diets is not going to cause cats any direct short term harm, it is hardly promoting better health and may well be predisposing them to problems long term. Nonetheless, commercially prepared dry cat food diets do provide a convenient way of feeding our cats and beneficially reduce tartar formation and the subsequent development of periodontal disease. Dental disease in cats is another key health problem in the feline population and one of the greatest risk factors of developing problems is feeding commercial wet food. Therefore dry diets should continue to play a role in feeding our feline companions.

Choosing the best diet for your cat.

Armed with the knowledge of a cat’s unique biochemistry we can select diets that are more aligned to their physiological needs by being savvy. Assessing food for its ingredients and nutritional break-down, rather than selecting one based on the most appealing cat on the pack, will help your cat’s long-term health and wellbeing. So when you’re next in the supermarket or pet store aisle considering what to buy, take the packet off the shelf and compare the backs of packs. Look for diets which have the first ingredient listed as a good animal based protein, ideally from a natural cat food that provides a fresh meat source, and compare the amount of protein, fat and ash.

We have focused here on dry diets as an example as they are easier to compare. Wet diets have large amounts of moisture in them, which varies between brands and makes comparison more challenging. The take home messages though are still the same; consider the quality of the ingredients and the sources of protein.

There are some great wheatfree cat food products available in the market and on online that provide a great source of protein and also ensure your cat has the essential nutrients they need to be healthy in the long-term.

We are in the process of launching our new natural cat food products. To mark this occasion we’re offering a free sample of this new range to the first 50 people that sign up to our pre-launch list. To sign up to be part of the new natural cat food revolution.

Cat Food: Many Choices

As I began researching articles about cat food, I found many with authoritative documentation and some with personal opinions. I personally wanted to know what would be the best to feed our mature cat. He has been on dry food since birth with expensive treats and occasionally a few pieces of meat – table scraps – of cooked chicken, beef, tuna, salmon or pork. This may not have been the most correct choice.

Our cat Simba, is strictly an indoor cat. He has always had good health and has a beautiful, glossy, smooth, orange tabby coat. He has starting vomiting a little bit, which appears to be unprocessed dry food or treats, and occasionally hair balls. I will leave the hairballs for another article. In this article I will look at cat food options. I decided to find out what kind of cat food we should get for him or if a dietary change is needed.

In my opinion, it often the ‘cost’ that drives the consumer’s decision on what cat food to purchase, even though our cats are very precious to us. I am sure we want the best food we can afford to give our pet, and what is best for him. In evaluating the issue, I believe that ‘costs’ can be evaluated in two ways.

First, we can get the best from the grocery store. Much of our decision is probably based on the advertising we hear or see through the media, and occasionally from a friend. It is often that we are at the store, cat food is on our list, our selection is on sale, it says it’s ‘natural’ or some other persuasive word on the label, and we place it in our cart with little thought to read the ingredient list. At home, our cat likes it when we feed him the selected food, so we think we have made a good choice.

Second, we can do a lot of research, decide to go to a pet store or make a purchase online for a good quality, high protein cat food, and know from what we have read that it is a good choice, and ‘cost’ didn’t really become the deciding factor. Our cat’s health became the more important issue.

Some cat owners are probably a little on both sides when selecting the cat food; I know I am. Cost is important, but the quality of health our cat enjoys is also very important. We enjoy spoiling our cats, and our cats love to be pampered, so sometimes we supplement our cat’s food with cat treats. Spoiling our cats with treats may not be a good decision either. He may want more because he is not nutritionally satisfied with the cat food we give him. How do we make the right decision?

As with ourselves, we feel better when we eat better, and so will our cats. Let me briefly share with you some information I found it articles that I researched.

1. Whole meats such as chicken, beef, lamb, salmon, etc. vs. cat food with ‘meal’, ‘by-products’, ‘animal digest’, and added sugars. Analysis: Whole meat is best, as you may know. If you really want to know what goes into some inexpensive pet food, and your stomach can stand the information, take the time to read about it on the web. Many of the products put into pet foods should not be ingested by any living thing, and these are products are put into pet food by many large pet food companies.

2. Grain based vs. grain free cat food: Analysis: Cats do not need grains. Most grains are used a fillers in canned cat food and as binding agents in dry cat food. Some manufactures believe that grains will add protein content, which it does, but cats need meat protein, not grain proteins. Some cats may also develop allergies to wheat or corn when added to their food.

3. Cat food with vegetables and fruits: Analysis: Often you can observe that vegetables, such as peas or corn, go right through a cat’s digestive tract without being processed in the intestines. Cats process meat proteins, but not vegetables or fruits.

4. Dry cat food vs. Canned/moist cat food: Analysis: Dry cat food is not natural. It has carbohydrates for fillers, such as grains, to hold it together. The label may indicate that it has high protein content but most of the protein is grain or milk protein, not meat protein. Don’t, however, feel that canned cat food is the only answer because it may also contain fillers including grains, meal, by-products, milk, etc. Several articles suggested that a combination of dry and canned may be the best for your cat.

5. Raw meat vs. high-protein canned cat food: Analysis: I never felt this issue was totally resolved. It has much to do with the individual cat and his owner. Canned food is more convenient and has a longer shelf life, and should be kept refrigerated after it is open. Raw food takes more preparation and has a shorter refrigerated shelf life. You can read discussions on this subject on several cat forums.

6. Grocery store cat food vs. pet store or online high quality cat food: Analysis: I believe that we could all come to the conclusion that a high protein from meat is the better choice, and that product would probably best be purchased at a pet store (which also carry the grocery store brands), or online.

In conclusion, here are a few final thoughts.

* Even thought the cost is higher with a better quality cat food, your cat will eat less because it is a better protein and he is nutritionally satisfied. He won’t eat as much, and he will be less likely to develop liver or other diseases. You, therefore, will have less expensive vet bills, and a happier, healthier cat.

* Read the labels, do research (other than asking friends and listening to or reading ads), and become an educated consumer. Purchase the cat food you feel is best for your cat.

* Consider the age of your cat. A kitten shouldn’t eat the same cat food as your mature cat. The brands will indicate on the label which food is best for your age of cat.

* Introduce any dietary changes slowly, probably over the course of a week or so.

* Research the web, read books, or talk with your vet so you can decide which cat food is best.

All cat foods are not the same. Your cat’s taste buds may like some brands or meats better than others. Purchasing the cat food you feel is best will give you peace of mind by giving him the best cat food you can afford, and he will feel better and more satisfied as he adjusts to his new diet.

Disclaimer: I am not a veterinarian nor do I have any formal training in any medical field. This article is not to replace the advice of your veterinarian. I am only providing options and ideas that you may want to discuss with your veterinarian

Having had cats and dogs most of her life, Lori Kniff is concerned about the health and safety of our best friends, our dogs and cats.