Vitamin A in Cat Food: Why Cats Can't Make It From Plants

Your cat can't survive on a plant-based diet—and vitamin A is one of the clearest reasons why.

Unlike humans and dogs, cats lack the enzyme needed to convert beta-carotene (the orange pigment in carrots and sweet potatoes) into usable vitamin A. This makes them obligate carnivores, meaning they must get certain nutrients directly from animal tissue. No shortcuts, no substitutes.

Understanding how vitamin A works in your cat's body can help you choose better food—and avoid the marketing gimmicks that fill kibble with plant ingredients your cat simply can't use.

The Science: Why Cats Can't Use Plant-Based Vitamin A

Vitamin A comes in two forms: preformed vitamin A (retinol), found only in animal tissue, and provitamin A (beta-carotene), found in plants.

Humans and dogs produce an enzyme called beta-carotene dioxygenase, which breaks down beta-carotene and converts it into retinol. Cats, however, produce almost none of this enzyme. A 2002 study published in the Journal of Nutrition confirmed that cats have virtually no ability to make this conversion.

This isn't a flaw—it's evolution. Cats evolved as hypercarnivores, consuming whole prey that provided all the preformed vitamin A they needed. They never developed the metabolic pathway to extract it from plants because they didn't need to.

What Vitamin A Does for Your Cat

Vitamin A isn't just one nutrient—it plays multiple critical roles in feline health:

• Vision: Retinol is essential for maintaining the retina and enabling low-light vision. Deficiency can lead to night blindness and, in severe cases, permanent eye damage.
• Immune function: Vitamin A supports the integrity of mucous membranes (the body's first line of defense) and helps regulate immune response.
• Skin and coat health: It promotes cell turnover and sebum production, keeping skin supple and fur glossy.
• Reproduction and growth: Pregnant and nursing cats need adequate vitamin A for healthy fetal development and kitten growth.

Without enough preformed vitamin A, your cat's health can deteriorate quickly—often starting with dull fur, then progressing to respiratory infections, poor wound healing, and vision problems.

Signs of Vitamin A Deficiency in Cats

Vitamin A deficiency is rare in cats fed complete commercial diets, but it can occur in homemade diets or low-quality foods that rely too heavily on plant fillers. Watch for:

• Dull, dry coat
• Night blindness or cloudy eyes
• Frequent respiratory infections
• Poor appetite and weight loss
• Reproductive issues in breeding cats

If you notice any of these signs, consult your vet. Blood tests can confirm deficiency, and dietary adjustments can reverse it—if caught early.

Best Animal-Based Sources of Vitamin A for Cats

The richest sources of preformed vitamin A are animal organs and tissues. Here's where your cat should be getting it from:

• Liver: Extremely high in retinol (which is why too much liver can cause toxicity—more on that below)
• Fish oils: Especially cod liver oil
• Egg yolk: A moderate, bioavailable source
• Poultry and red meat: Lower levels, but still valuable
• Insects—especially black soldier fly larvae (BSFL): A sustainable, nutrient-dense source that's gaining attention in modern pet nutrition

How Black Soldier Fly Larvae Stack Up

Black soldier fly larvae are packed with preformed vitamin A, along with essential amino acids, healthy fats, and minerals like calcium and phosphorus. Research published in the Journal of Insects as Food and Feed shows that BSFL contain comparable or higher levels of retinol than many conventional protein sources.

What makes BSFL particularly interesting? They're farmed sustainably, require minimal water and land, and produce far fewer greenhouse gases than chicken or beef. For Malaysian cat owners looking to balance nutrition with environmental responsibility, insect protein is a win-win.

And because BSFL are whole-prey ingredients (exoskeleton, organs, and all), they deliver a more complete nutrient profile—closer to what a cat would eat in the wild.

Can Cats Get Too Much Vitamin A?

Yes—and it's usually from well-meaning owners feeding too much liver or fish-based diets.

Vitamin A is fat-soluble, meaning it's stored in the liver and fatty tissues. Over time, excessive intake can lead to hypervitaminosis A, a condition that causes bone malformations, joint pain, and lethargy. In severe cases, it can be life-threatening.

The good news? Vitamin A toxicity is rare in cats eating balanced commercial diets. It typically only occurs when liver makes up more than 5–10% of the diet over an extended period.

Complete cat foods—including those made with insect protein—are formulated to meet AAFCO standards, which include safe upper and lower limits for vitamin A. You don't need to guess or calculate; the work is already done.

Choosing Food That Respects Your Cat's Biology

When you're comparing cat foods, don't just look at the protein percentage. Ask: where is that protein coming from, and does it deliver the nutrients my cat actually needs?

Cats are obligate carnivores. Their bodies are designed to extract nutrients from animal tissue—not grains, legumes, or vegetables. Preformed vitamin A is just one example of why that matters.

Whether it's chicken, fish, or black soldier fly larvae, your cat's food should reflect their evolutionary needs. And if that food happens to be better for the planet too? Even better lah.

Ready to Feed Smarter?

Tera Diet delivers complete animal-based nutrition with black soldier fly larvae—rich in preformed vitamin A, essential amino acids, and healthy fats your cat can actually use. No fillers, no compromises. Just real nutrition, rooted in science and sustainability.

Explore our range today and give your cat the fuel their body was built for.