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Grain-free cat food has become a popular choice among pet parents in recent years, often driven by the belief that it might offer a healthier diet for their feline companions. But is grain-free food bad for cats? Grain-free cat food is formulated to exclude common grains like wheat, corn, and rice. Instead, it typically relies on alternative carbohydrate sources like potatoes, lentils, and other legumes. 

This approach aims to mimic a more meat-centric diet in line with a cat's natural dietary preferences. Advocates for grain-free cat food argue that it can help prevent certain health issues, such as food allergies or sensitivities. However, there are different opinions and concerns regarding the potential downsides of grain-free diets for cats. Is grain-free bad for cats? Keep reading to learn more about the grain-free diet for cats.

What is a Grain-Free Diet?

A grain-free diet is a nutritional approach that eliminates common grains from a cat's food. These grains typically include wheat, corn, rice, barley, and oats. Instead of grains, grain-free cat food relies on alternative carbohydrate sources to create a diet that more closely resembles a cat's meat-based diet in the wild, where grains are not a significant part of their nutritional intake. [1]

Grain-free cat food is marketed as a way to provide a diet that aligns with a cat's biological needs and dietary preferences. This approach is primarily driven by the idea that cats are obligate carnivores, which means they've evolved to rely on a diet that consists primarily of meat. [2] While cats require certain nutrients in grains, a grain-free diet attempts to meet these nutritional needs through alternative sources. 

While all this might make sense, there's actually no reliable evidence that grains are bad for cats. [3] Grains can be a part of a cat's diet, and many commercial cat foods include grains as a source of carbohydrates and dietary fiber. 

Benefits & Risks of a Grain-Free Diet For Cats

Again, there's no evidence to suggest that grain-free diets for cats are beneficial. But is grain-free cat food bad for cats?

One of the main arguments for grain-free diets is the idea that cats might be less likely to develop allergies or sensitivities to grains. For some cats with specific food allergies, avoiding grains could potentially help manage these issues. However, food allergies in cats are rare and typically caused by animal-sourced ingredients like chicken, milk, fish, and eggs, all of which can be found in grain-free cat diets. [4]

Many pet food companies also state they have lower carbohydrate content, which could be beneficial for overweight cats or those with diabetes. Reducing carbohydrates can also help manage blood sugar levels. But is it true? Unfortunately, claims vary by company. Some grain-free options for cats actually contain more carbohydrates than regular cat diets. [4] All cat food contains carbohydrates, and the ingredients that replace grains are no better for your cat. [4]

Risks of a grain-free diet for cats

So, why is grain-free bad for cats? Ultimately, grain-free diets don't seem to pose a health risk to cats. [5] However, there are potential downsides, such as: 

  • Nutritional imbalance: Eliminating grains can lead to a lack of essential nutrients in a cat's diet. Grains can provide valuable nutrients and serve as a source of dietary fiber. 
  • Expensive: Grain-free cat food is often more expensive than conventional cat foods and may not be sustainable for all pet parents. 
  • Potential for allergies to other ingredients: While some cats may have sensitivities to grains, they can also develop allergies to other ingredients like proteins. Grain-free doesn't guarantee the absence of allergens. 
  • Limited scientific support: The benefits of grain-free diets for cats lack substantial scientific backing, so it's unclear whether these diets consistently deliver the claimed advantages. 
  • Cardiovascular health concerns: In recent years, concerns have emerged about a potential link between a grain-free diet and heart disease in pets, particularly dilated cardiomyopathy (DCM). DCM has been linked to grain-free dog food , but more research is needed to determine a relationship between grain-free diets and DCM in pets. [6]

Is a Grain-Free Diet Right For Your Cat?

Determining whether a grain-free diet is right for your cat requires careful consideration of their individual needs and consulting with your veterinarian. 

Considerations to weigh before feeding your cat a grain-free diet

Here are some factors to weigh when making this decision: 

  • Your cat's health needs: Cats have varying health requirements, and what works well for one may not suit another. Consider your cat's age, activity level, and existing health issues. 
  • Avoid generalizations: Not all grain-free diets are the same, and the presence or absence of grains is just one aspect of the formulation. What's crucial is the overall nutritional content, quality of ingredients, and the balance of nutrients in the food. 
  • Consider carbohydrates: While grain-free diets may lack grains, they still contain carbohydrates from other sources. Be mindful that the carbohydrate content might not be significantly different from grain-based diets, so grain-free doesn't necessarily mean low carb. [4]
  • Evaluate ingredients: Some grain-free diets include ingredients that aren't necessarily "healthier" but can increase the cost of the food. [4] Assess the ingredient list to ensure it aligns with your cat's nutritional needs.  
  • Your cat's response: After transitioning to a grain-free diet, closely observe your cat's response. Look for changes in their coat, skin, energy levels, and overall health. If you notice any negative effects, such as allergies or digestive issues, discuss these with your veterinarian. 
  • Cost: Grain-free diets are often more expensive than grain-based alternatives. Consider your budget and whether the added expense aligns with the potential benefits for your cat. 
  • Consult your vet: Your veterinarian is your best source of guidance when selecting the most appropriate diet for your cat. They can assess your cat's overall health and provide nutritional advice based on their specific requirements. Your vet can also help identify any allergies or sensitivities your cat might have. 


Is it okay for cats to eat grain-free?

Whether it's okay for cats to eat grain-free diets is a subject of ongoing debate. Is a grain-free diet bad for cats? Proponents of grain-free diets argue that these diets are beneficial for cats with dietary sensitivities or allergies. On the other hand, critics argue that there's insufficient scientific evidence to support the notion that grains are inherently harmful to cats. 

While a grain-free diet hasn't been proven harmful to cats, it hasn't proven beneficial for them either. Since grain-free diets are more expensive, it just means you might be spending more money for virtually no reason. 

So, is it okay for cats to eat grain-free? It depends. Every brand is different. While some may genuinely provide a balanced and appropriate diet for cats, others can be misleading. Just because a cat food is marketed as "grain-free" doesn't necessarily mean it's healthier or better for your cat. Some grain-free options can contain even more carbohydrates than regular cat food, potentially contributing to weight gain and other health issues.

Moreover, the term "grain-free" can sometimes be used misleadingly. Some pet foods may claim to be grain-free but still contain grains or substitute them with other high-carb ingredients. 

This emphasizes the need for pet parents to be vigilant when choosing food for their cats and look past marketing claims to scrutinize the ingredients list. For the health and well-being of your feline companion, it's essential to consult with a veterinarian who can help you navigate the world of cat food and make informed choices based on your cat's specific dietary requirements.

Why don't vets like grain-free cat food?

Vets are medical professionals who look at evidence to make their decisions. One major concern is the lack of scientific evidence to substantiate the widespread marketing claims that grain-free diets are inherently better for cats. Vets also worry about the risk of nutritional imbalances in grain-free diets since grains can provide essential nutrients like fiber and certain vitamins and minerals. 

What is the best food for cats?

The best food for cats is a high-quality cat food that meets their specific nutritional needs. These foods are formulated to provide the essential nutrients cats require, including fats, proteins, carbohydrates, vitamins, and minerals. Most commercial cat foods come in two main types: dry kibble and canned wet food. The choice between them often depends on the cat's preference and specific dietary needs. 

While some cats do well on a primarily dry or wet diet, it's essential to focus on the overall quality of the food rather than the format. Consult a veterinarian to select the best cat food based on your cat's age, activity level, and health status to ensure their long-term health and well-being. 

Close up of cat eating from yellow bowl

Final Notes

The debates surrounding grain-free diets for cats hinge on whether they truly offer advantages or present potential risks. The absence of grains in cat food doesn't necessarily translate to a healthier diet, and it's essential to assess each brand and formulation individually. Additionally, grains can offer valuable nutrients and dietary fiber beneficial for cats. 

To ensure your cat's well-being, it's crucial to consult with a veterinarian who can help you make informed dietary choices based on your cat's specific health needs. Sign up for a Dutch membership today for expert guidance on your cat's nutrition and overall health. 




  1. "Is Grain-Free Pet Food Safe?" Stand For Animals,

  2. "Feeding Your Cat." Cornell University College of Veterinary Medicine, 21 June 2023,

  3. "Grain-Free Diets – Big on Marketing, Small on Truth." Clinical Nutrition Service at Cummings School, 30 Sept. 2016,

  4. Heinze, Cailin R. "Research Update: New Insight into Grain-Free Cat Diets." Clinical Nutrition Service at Cummings School, 16 Mar. 2022,

  5. Miller, Matthew Everett. "Is Grain-Free Cat Food Better?" PetMD, 18 Jan. 2021,

  6. "Grain-Free Pet Food: Helpful or Harmful Diet?" ASPCA,

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