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Why Soy is Harmful For Cats

Being a caring cat owner goes beyond providing affection and playtime; it also means ensuring your feline friend gets the best nutrition tailored to their needs. With the evolving human diet and an array of food options, many cat owners often wonder, “Can cats eat soy?” or “Is soy harmful for cats?”—especially since soy is an ingredient present in a plethora of foods we consume daily, some of which are advertised as “healthy.” 

It's important to be informed about what's beneficial and what might be harmful for our pets. That's why we are taking strides to educate cat owners, not just on cat litter but also on dietary needs that prioritize cat health. So, before you share that soy-based snack with your feline companion, here's what you need to know.

What is Soy?

Soy, a product derived from soybeans, is a legume native to East Asia. Its popularity in human food—especially Asian cuisine—is undeniable, given its presence in tofu, soy milk, soy sauce, and numerous processed foods. Given its history, you might wonder if soy could be beneficial for cats. When it comes to our feline friends, it’s not that simple.

Why Cats Shouldn’t Eat Soy

Cats are obligate carnivores. This means they require certain essential amino acids found only in animal protein. While soy does provide protein, it's not the kind your cat needs. Three other reasons why soy might not be the best choice for your feline include:

#1 Soy Allergy in Cats

Some cats can develop an intolerance or allergy to soy, leading to digestive issues, skin irritations, or more severe reactions.  

#2 Phytoestrogens

Soy contains substances called phytoestrogens, which can impact hormonal balance. For cats, these compounds might disrupt their natural processes.

#3 Soy and Digestion

In general, beans are hard for cats to digest. This can lead to bloating, gas, and discomfort.

Recent studies also suggest that a diet high in soy might lead to mineral deficiencies in cats. Additionally, there appears to be a link between high-soy diets and hyperthyroidism in cats. Given these reasons, it's clear why many experts would answer "Is soy bad for cats?" with a resounding "yes!"

Common Soy Foods to Avoid

With the prevalence of soy in foods, it's pivotal to be wary of what you give your cat. Here are foods commonly containing soy:

  • Tofu and Edamame: Though part of many Asian cuisine dishes, these shouldn’t be offered to cats.
  • Soy Milk and Ice Cream: Now, as a generous cat owner, you may find yourself debating, “Can cats have soy milk or a lick of my soy ice cream?” While a kind gesture, steer clear of offering this kind of snack.
  • Processed Foods: Many foods, including many labeled as “cat food,” list soy as an ingredient. While cats may enjoy the taste, the soy content can be harmful and should be avoided. 

Always check the ingredients list. If soy or soy products appear, it's best to set it aside and not offer it to your cat.

Alternative Foods That Are Safe for Cats

Thankfully, many safe and healthy alternatives exist. Let’s take a look at some of the best soy-free options for cats:

PrettyPlease Cat Food

PrettyPlease cat food is a soy-free alternative that ensures your cat gets all the right nutrients without the risks of soy, grain, corn, or wheat. Many PrettyLitter customers rave about the visible health benefits after switching to a diet free of these common allergens. 

Natural Proteins

Can cats have tuna? You bet! Offer your cat sardines, tuna, or even canned tuna in moderation. Is chicken good for cats? Sure thing! Real chicken can be a safe and nutritious treat for cats, provided it's given in moderation and without any additives.

Remember: while humans can eat foods like refried beans or enjoy soy sauce in their sushi, these aren't suitable for cats. Always opt for cat-specific products that are made with real ingredients when unsure.

Paws & Reflect: Nourishing Our Feline Friends Right

While our cats might not understand the intricacies of their diet, they surely reap the benefits of our informed choices. With the insights we've shared about the dangers of soy and the benefits of soy-free alternatives, you're now equipped to make informed choices for your companion. 

Remember, the journey to optimal cat health is a continuous one, but PrettyLitter is on your side. 


  1. National Library of Medicine. Soy and Phytoestrogens: Possible Side Effects. 
  2. Research Gate. Soy isoflavone metabolism in cats compared with other species: urinary metabolite concentrations and glucuronidation by liver microsomes. 
  3. NPR. Soybeans May Have Fed Asia Earlier than Thought. 
  4. Journal of Feline Medicine and Surgery. Hyperthyroidism in Cats   
  5. ASPCA. Why Can’t My Cat Be Vegan? 


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