Why Cats Need a High-Protein Cat Food

Happy Sleepy Cat
Happy Sleepy Cat

Humans are omnivorous (able to derive nutrition from both plant and animal sources), but Cats are obligate carnivores, so they require a high-protein diet for optimum health. Most commercial cat foods, particularly dry foods, consist primarily of starchy carbohydrate filler. To make matters worse, these carbohydrates are broken down during the preparation of dry kibble, so they enter the cat’s bloodstream as sugar. Cats can easily become obese as a result of a high-carb diet, and this extra weight puts a strain on their joints, making exercise more difficult. It also puts them at risk for a variety of diseases.

Many cat foods sold as diet foods are even higher in carbohydrates, because calories are removed by reducing fats rather than carbs. As a result, the food is less satisfying, and the cat is both malnourished and chronically hungry. The only way to attain weight loss with such foods is to feed such a small amount that the cat experiences feelings of near-starvation.

Feeding a high-carbohydrate diet to a cat puts him at risk for a number of health problems, including inflammatory bowel disease (IBD), urinary tract disease, and diabetes.

Inflammatory Bowel Disease in Cats

IBD is an immune-reactive condition in which the gastrointestinal tract treats food molecules as foreign invaders. Many felines develop IBD as a result of high carbohydrate diets. Sufferers experience recurrent bouts of diarrhea, and in some cases, vomiting as well, and may begin defecating outside the litter box.

Many commercially available cat foods contain ingredients that would not naturally occur in a wild cat’s diet. Such foods can create an allergic reaction. Diets promoted as hypoallergenic will only be effective if they are also high in protein and moisture and low in carbohydrates – in other words, as close to the diet that the cat’s ancestors ate as possible.

Urinary Tract Problems in Cats

Many cats develop diseases of the urinary tract, which make urination painful. This may cause cats to urinate outside the litter box because they come to associate the box with pain. Owners may mistakenly believe that their cats are being disobedient, and cats have been surrendered to shelters or euthanized due to this faulty assumption.

An epidemic of urinary tract problems in cats coincided with the increasing use of cheap kibble as a dietary staple for pets. Initially, researchers believed that it was the magnesium in these foods that was causing the problem, despite the fact that natural prey animals are also high in magnesium. This faulty assumption led to the popularity of low-ash cat foods.

Dry cat foods can contribute to urinary tract problems because they are low in moisture, so the cat lives in a state of chronic dehydration. They also create a more alkaline urine pH, which can cause inflammation of the urinary tract. Feeding a high-moisture, high-protein, premium cat food can help prevent urinary tract problems. Leaving bowls of water at various locations around the house or purchasing a fountain-type water dish can also encourage a cat to take in more fluids.

Diabetes in Cats

Indoor cats are certainly far safer than outdoor cats, but the combination of a more sedentary indoor lifestyle and cheap, high-carbohydrate cat food has caused many cats to become obese, and obese cats are more likely to develop diabetes. While obesity itself does not cause diabetes, lifestyle factors that make a cat pack on extra weight also contribute to the development of the disease.

Because carbohydrates are not a natural diet for cats, their pancreas are not well-suited to handling regular large loads of sugar. Not all cats will become obese on a high-carbohydrate diet, but skinny individuals avoid obesity due to their genetics rather than because they are healthier. A skinny cat can also develop diabetes due to poor diet and genetic predisposition.

Dramatically increasing rates of feline diabetes are largely attributable to low-protein cat foods and a sedentary lifestyle. Switching to a high-protein diet and ensuring that cats get plenty of opportunities for exercise reduces the risk of diabetes significantly.

Preventing and Treating Feline Medical Conditions with Diet

Feeding a high-protein, low-carbohydrate diet can help to prevent a variety of medical problems in cats, and switching to a more natural diet can often cure or reduce the symptoms of these illnesses if they do occur. In the case of diabetes, the pancreas of some cats have actually started working again after switching to a high-protein diet so that owners no longer had to give daily insulin shots. Other benefits of high-protein diets often include:

    • Increased energy
    • Weight loss
    • Reduced arthritis symptoms
    • Reduced risk of constipation
    • Improved coat quality

Meat Should Be the First Ingredient Listed on a Cat Food Label

When reading the ingredients list on cat foods, make sure that meat – not meat by-product, corn, or wheat – is the first ingredient listed. Be sure to check the second, third, and fourth ingredients as well because some manufacturers use three different corn products (this allows them to get away with listing meat as the first ingredient when the bulk of the food is actually made up of corn).

How to Calculate Protein in Cat Food

Protein should comprise at least 30% of a cat’s food, and preferably a much higher proportion. Protein contents in wet foods can be calculated using the following formula:

    • % of protein divided by % of dry matter x 100

If the analysis on the label says that the food is 80% moisture, then the dry matter will be the remaining 20%. If the protein is listed as 10%, this number will be divided by the dry matter percentage:

    • 10 divided by 20 x 100

This gives a protein content of 50% for the dry matter.

Cheap Cat Foods Are Not a Bargain in the Long Run

Cat foods that are made up of predominantly high-quality protein are more digestible than high-carbohydrate, grain- or vegetable-based foods. This means that buying cheaper pet foods doesn’t really save money in the long run, because most of the lower quality food ends up in the litter box. Also, a cat fed cheap food will need to eat more of it to feel satisfied, which can cause him to become simultaneously obese and malnourished.

Low-quality, high-carbohydrate cat foods may be only 60% digestible or less, compared to 70-80% or more for high-quality foods. This means that with cat foods, owners get what they pay for. Spending more on higher-quality cat foods saves on cat litter costs in the short run and veterinary bills in the long run.

For more cat articles, see the main Cats page.

Note: This article is provided for informational purposes only and is not intended as a substitute for veterinary consultation and care.


    • Drs. Foster & Smith, Veterinary & Aquatic services Department. (2009). “Protein Requirements for Good Nutrition.” PetEducation.com.
    • Fox, M.W.; Hodgkins, E.; & Smart, M.E. (2008). Not Fit for a Dog! The Truth About Manufactured Dog and Cat Food. Linden Publishing.

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