A cat looking at can of overnight oats

Grain-Free Cat Food: Good or Bad?

Grain-free cat food is becoming increasingly popular for a number of reasons. Pet parents are spending more time researching what is best for their pets, plus there is (quite rightly) a greater emphasis on preventative health care nowadays.

The theory behind grain-free diets is that cats are carnivores and can’t easily digest grains; therefore grains like corn, wheat, corn, barley and oats can damage the gastrointestinal tract and contribute to food allergies or intolerances. But is there actually any truth behind these theories?

Benefits of grain-free cat food

We will now briefly consider some reasons why grain-free cat food is supposedly on the market.

Allergies

While grain free has become a hype in recent years, the real reason these foods excist is because cats can be allergic to grains like we can. But contrary to the general consensus, this is a rather rare occurence: studies have found that grains are one of the least likely sources of food allergy.

A good source of protein

Protein is the most important ingredient in cat food because unlike most animals, they are a cat’s primary energy source. A lot of people falsely believe that these proteins always need to come from animals, but this is only partly true. The reason animal sourced proteins are so important is because they contain the essential amino acid taurine, which is not found in other proteins. This is why every food should contain some form of meat.

However, the assumption that cats can’t get protein from other types of food like grains is completely false. In fact, cats are very good at digesting plant-based ingredients. These can be a great source of not only protein but also fats and carbohydrates.

From a scientific point of view, food allergies are currently the only valid reason to put your cat on a grain-free diet

Disadvantages of grain-free cat food

There is a common belief that grain is added to cat food as a cheap filler material. This is a misconception; cats can digest grain just fine and it be a great source of fiber, vitamins, minerals and essential fatty acids.

A serious problem with many grain-free diets is that they are cutting out some essential nutrients (or are too high in them) without good cause. Not all grains contain gluten, so even if your cat cannot tolerate gluten (which is pretty rare by itself), they may still not neccessarily need to be put a diet that contains no grains at all.

Phosphor and Kidney Disease

When grains are removed from a diet, more meat is often used to replace that volume. A big problem with diets high in meat is that they often contain too much phosphorus. While phosphorus is an essential nutrient in the right amounts, there is a link between high-phosphorus foods and a faster progression of kidney disease in cats. Grains, on the other hand, can provide a bit of protein while staying very low on phosphorus.

Constipation

Although carnivores, cats are able to digest and obtain nutrients from grains, albeit to a lesser extent than dogs. The carbohydrates that are substituted in place of grains are often lower in fiber and higher in calories. Leading to the common question “does grain-free cat food cause constipation”? Indeed, it can contribute to gastrointestinal problems. Fiber is important for passing stools and preventing fur balls.

Comparisons to normal food

We looked at a recently published study that compared the carbohydrate content of several grain-free foods versus normal foods. These were some of the conclusions:

  • The average calories across both categories were similar
  • The average amount of carbohydrates was significantly lower in grain-free food
  • The most common plant-sourced ingredients in grain-free foods were peas, cranberries, potato and carrot.
  • Grain-free food products were more likely to contain exotic meats such as rabbit and bison meat.

Grain-free food reviews

When looking at reviews in order to choose a grain-free cat food there are several things to consider. The nutritional value, rather than the ingredients, is the single most important thing to review (unless your cat has been diagnosed a rare case of food intolerance).

A good food grain-free food can be recognised by the amount of fiber is present, whether the calorie content is low enough, and if the phosphorous levels are now too high. The most important nutrients found in grains are taurine, iron, thiamine, calcium, riboflavin, folate and niacin; ideally the review should discuss these.

Conclusions

So, is grain-free cat food better than regular foods? Some grain-free cat foods are lower in carbohydrate and higher in protein than regular foods. This is of benefit since cats are obligate carnivores and protein is their primary energy source.

High-carbohydrate diets predispose cats to diabetes and obesity, so should generally be avoided. However, ‘grain-free’ does not always mean low carbohydrate. Some grain-less cat foods substitute grains for other carbohydrate sources; such as potato, sweet potato or tapioca.

So why should I choose grain-free food for my cat? Some studies have suggested that grains can cause alkaline urine, which harms the urinary tract. However, this depends on the quantity of grains and is not yet scienftifically proven.

There is currently no published evidence to support claims that cat foods without grains generally improve feline health. However, there are anecdotal reports of improved skin and digestive health. As long as the grain-free diet is complete and balanced then there is no harm in trialing one, to see if it suits your kitty. Just be sure to choose a complete one, designed for your cat’s life-stage.

The only real evidence-based advantages of diets without grains are better skin management and preventing gastrointestinal disease that is caused by an adverse food reaction; or for elimination diets to determine what foods a cat may be intolerant to. Elimination diets should only be performed under the guidance of a veterinary surgeon.

In a saturated market, pet food manufacturers are trying everything to sell their products and it seems grain-free is one of the latest trends used purely for marketing purposes. Aside for rare cases where pets are intolerant to grains, there is little to no scientific evidence to support these claims that grain-free diets are healthier than their normal counterparts.

In fact, the majority of cats are very efficient at digesting grains, and whole grains contribute valuable nutrients including vitamins, minerals, essential fatty acids and fiber to a diet.

In short, don’t buy into the grain-free hype. The only thing these foods do that regular foods don’t, is quickly empty your wallet.

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