Can Cats Eat Sardines Every Day?

As a cat parent, you may often find yourself wondering about the best dietary choices for your feline friend. One question that frequently arises is, “Can cats eat sardines every day?” Sardines, being rich in omega-3 fatty acids, protein, and various essential minerals, seem like a healthy choice. However, as with any food, moderation is key. Let’s delve into the scientific facts and scholarly articles to understand this better.

Nutritional Value of Sardines

Sardines are small, oily fish known for their significant health benefits. They are packed with omega-3 fatty acids, which are essential for maintaining a cat’s healthy skin and coat. They also provide a good source of protein, which is crucial for muscle development and energy. Additionally, sardines are rich in minerals like calcium, iron, and potassium, and vitamins such as B12 and D.

A 100g serving of sardines provides approximately 208 calories, 24.62g of protein, 11.45g of fat, and a substantial amount of omega-3 fatty acids. However, it’s important to remember that a cat’s dietary needs are different from humans, and what’s beneficial for us may not always be ideal for them.

The Pros and Cons of Feeding Sardines to Cats


  1. Omega-3 Fatty Acids: Omega-3 fatty acids, found abundantly in sardines, are known to support heart health, reduce inflammation, and promote a shiny coat in cats.
  2. High-Quality Protein: Sardines are an excellent source of high-quality protein, which is essential for cats as they are obligate carnivores.
  3. Hydration: Since sardines are typically packed in water or oil, they can help increase your cat’s fluid intake, which is beneficial for cats prone to urinary tract issues.


  1. Mercury Content: While sardines have lower mercury levels than larger fish, frequent consumption can still lead to mercury accumulation in a cat’s body.
  2. High Sodium Content: Sardines packed in salt or brine have high sodium content, which can be harmful to cats, especially those with kidney or heart conditions.
  3. Allergies: Some cats may be allergic to fish, including sardines. Symptoms can include vomiting, diarrhea, and skin irritations.

Can Cats Eat Sardines Every Day?

While sardines can be a healthy addition to a cat’s diet, they should not be the mainstay. According to the American Veterinary Medical Association (AVMA), a cat’s diet should be nutritionally balanced and complete. This means it should contain the right proportions of proteins, fats, carbohydrates, vitamins, and minerals.

Feeding your cat sardines every day could lead to an imbalance in their diet. For instance, a diet high in fish can lead to a deficiency in vitamin E, resulting in a condition called steatitis, also known as yellow fat disease. Furthermore, daily consumption of sardines could potentially lead to an excess intake of certain nutrients like vitamin D, which in high amounts can be toxic to cats.

The Verdict: Moderation is Key

While sardines can be a beneficial addition to your cat’s diet, they should be fed in moderation. Consider offering sardines as a treat or a supplement to your cat’s regular diet, rather than a daily meal. Always opt for sardines packed in water rather than oil or brine, and ensure they are free from added salt or spices.

Scientific Insights on Cats and Sardines

Research on feline diets provides some insights that can be applied to our question. A study titled “Estimation of the dietary nutrient profile of free-roaming feral cats: possible implications for nutrition of domestic cats” highlights that cats are strict carnivores, with their daily energy intake from crude protein being 52%, from crude fat 46%, and from N-free extract only 2%. This indicates that while sardines can provide the necessary protein and fat, they should not be the only source of these nutrients.

Another study, “Alternative Dietary Fiber Sources in Companion Animal Nutrition”, emphasizes the importance of dietary fiber in a cat’s diet. While sardines do not provide fiber, they can be part of a balanced diet that includes sources of fiber such as certain vegetables that are safe for cats.

The research “Peculiarities of One-Carbon Metabolism in the Strict Carnivorous Cat and the Role in Feline Hepatic Lipidosis” underlines the unique nutritional requirements of cats due to their carnivorous nature. It suggests that cats have a higher requirement for certain amino acids, which sardines can provide, but also warns about the risk of hepatic lipidosis (fatty liver disease) that can occur with an imbalanced diet.

Lastly, the study “Influence of nutrition on feline calcium oxalate urolithiasis with emphasis on endogenous oxalate synthesis” discusses the risk of calcium oxalate urolithiasis (bladder stones) in cats. While this study does not directly link sardines to this condition, it serves as a reminder of the importance of a balanced diet to prevent health issues.


In conclusion, while sardines can be a beneficial part of a cat’s diet due to their high protein content and omega-3 fatty acids, they should not be the sole food source for your feline friend. Like all things, they should be given in moderation as part of a balanced diet. Always consult with your veterinarian before making significant changes to your cat’s diet to ensure their nutritional needs are being met and their health is not at risk.

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Amelia Kteylor

Amelia Kteylor, DVM, attended the University of Georgia. She is a cat expert with 20 years of experiences in field. She has a passion as a writer and editor for pet publishing industry too. Amelia contributes to numerous pet magazines in the areas of pet health and groom. Further, she volunteered in cat rescue centers in her leisure time.

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