Feline Nutrition Basics: Essential Amino Acids, Hydration & Science-Based Food Selection

Cats are obligate carnivores. Unlike dogs and humans, they cannot obtain sufficient nutrients necessary for survival from plant-based foods alone. Understanding this biological characteristic is the first step toward proper feline nutrition management.

Nutritional Requirements Unique to Cats

Taurine (Essential Amino Acid)

Cats cannot synthesize sufficient taurine on their own (unlike dogs and humans, who can produce it internally). Taurine is essential for normal heart function, retinal health, and immune system maintenance. Deficiency can lead to dilated cardiomyopathy (DCM) and retinal degeneration (a cause of blindness).

Taurine is abundant in meat, fish, and eggs, and is added to commercial complete and balanced cat foods. Since it is found in minimal amounts in grains and vegetables, foods with high plant-based ingredients require caution.

Arachidonic Acid (Essential Fatty Acid)

While many animals can synthesize arachidonic acid from linoleic acid in their bodies, cats have a limited ability to perform this conversion and must obtain it directly from their diet. Arachidonic acid is involved in cell membranes, inflammatory responses, and reproduction.

It is abundant in animal fats, particularly chicken fat and pork fat.

Vitamin A

Dogs and humans can convert beta-carotene (plant-derived) into vitamin A, but cats have virtually no ability to do so. They require preformed vitamin A (retinol) found in animal-based foods.

Niacin (Vitamin B3)

Cats are extremely inefficient at synthesizing niacin from tryptophan, making direct dietary intake necessary. It is abundant in meat and fish.

Differences Between Dry and Wet Food

Dry Food (Kibble)

Advantages: - High storage stability and cost-effective - Some preventive effect against tartar buildup - Easy to use with automatic feeders

Disadvantages: - Low moisture content (around 10%) - Many varieties are high in carbohydrates (cats do not require large amounts of carbohydrates)

Wet Food (Canned and Pouched)

Advantages: - High moisture content (75–85%): allows natural water intake - High palatability - Generally lower in carbohydrates

Disadvantages: - Lower storage stability (use quickly after opening) - Higher cost - Some products may have unbalanced nutrition

Which Should You Choose?

Most feline nutrition specialists recommend wet food as the main diet, or a combination of dry and wet food. This is related to water intake in cats.

Importance of Hydration

Cats' ancestors originated in desert regions and were accustomed to obtaining water from their food (prey). As a result, cats have a duller sense of thirst than humans and tend to drink less water voluntarily.

Chronic dehydration is a major risk factor for urinary stones and chronic kidney disease (CKD). CKD is very common in cats, with higher prevalence in senior cats.

Tips for Increasing Water Intake: - Incorporate wet food into meals - Use a cat water fountain - Set up multiple water bowls in different locations - Use stainless steel or ceramic bowls (some cats dislike the odor of plastic) - Add water to food (pour a small amount of water over the food)

How to Read Ingredient Labels

When selecting commercial cat food, check the ingredient list.

Check the Main Ingredients: Ingredients are listed by content amount in descending order. It's a good sign if the first 2–3 ingredients are animal-based proteins (chicken, salmon, beef, etc.).

Pay attention to statements like "Meal X% or more," as the weight may be calculated either before or after drying.

Ingredients to Avoid: - Onions and chives: Toxic to cats - Propylene glycol: May damage cat red blood cells - Excessive minerals (especially phosphorus and magnesium): Burden on kidneys and urinary tract

Check Crude Protein, Crude Fat, and Carbohydrates: Recommended nutritional ratios for cats (on a dry matter basis): - Protein: 35–50% or higher - Fat: 20–30% - Carbohydrates: Low (25% or less is ideal)

Feeding by Life Stage

| Life Stage | Features and Points | |--------------|-------------| | Kittens (up to 1 year) | High calorie, protein, and calcium requirements. Use kitten-specific food | | Adult Cats (1–7 years) | Appropriate calorie control. Weight gain is common after spaying/neutering | | Senior Cats (7 years and older) | Phosphorus restriction is important to reduce kidney burden. Increase water intake |

Summary

Feline nutrition should be based on respect for their biological nature as obligate carnivores. Using a complete and balanced diet that meets cats' unique nutritional requirements—such as taurine, arachidonic acid, and vitamin A—combined with conscious attention to hydration, supports long-term health.

Do not hesitate to consult with your veterinarian if you are unsure about which food to choose.