07/28/2026
The Most Common Cause of Diarrhea in Cats.
A client reached out to me about a kitten she got from me over a year ago. His name is Raja. Since he was little, he's had chronic diarrhea. Sheās taken him to multiple vets, gone through endless tests that showed nothing, spent tons of money, and put the poor cat through enough stress to break anyone down. Raja was pumped with unnecessary meds that didnāt help. After all that, a vet finally prescribed a hydrolyzed diet ā and guess what? The diarrhea stopped.
So, while the diarrhea issue is technically āsolved,ā now the owner is worried that Raja isnāt getting enough of all the āessential vitaminsā listed on the fancier foods she used to feed him. But going back to the vet is no longer an option ā Raja literally starts panicking as soon as she even thinks about pulling out the carrier. Thatās why she came to me. And frankly, I do give out a lot of health advice.
I get messages like this often. More often ā I donāt. Most people go through the same route: diarrhea ā dozens of tests ā meds ā stress ā finally, some āprescription food.ā So I decided to write this post. I know itāll be helpful for many owners.
From years of experience, Iāll say this: the most common cause of diarrhea in cats is the food. And now letās dig in.
Acidāalkaline conflicts in pet food
Meat is digested in an acidic environment. Most fruits, berries, leafy greens ā are alkaline. In humans, combining those can often lead to bloating, fermentation, and gas. For cats and dogs itās not identical, but the logic partially holds.
Some basics:
Ā· Cats are obligate carnivores. Their digestion is designed for pure meat.
Ā· Dogs are facultative carnivores. They can handle a little starch or vegetables ā but not non-stop and not in bulk.
Now the key points:
šø Combining acidic meat with alkaline fluff (blueberries, spinach, broccoli, sweet potatoes) isnāt some science-based nutritional need ā itās just marketing for humans.
šø Sensitive cats may respond with bloating, irregular stool, and inflammation.
šø Many American brands add so-called āsuperfoodsā ā for the buyer, not the animal. A trendy customer sees chia, kelp, or blueberries and thinks āwow, so healthy!ā Meanwhile, your catās pancreas is quietly screaming for help.
Bottom line: a lot of digestive issues donāt come from allergies or infections ā they come from poor digestion of this damn fusion food. Meat + berries in a kibble? Not a gourmet combo ā a GI disaster.
Conclusion:
Most gut problems in cats arenāt caused by pathogens ā but by marketing. Mixing acidic and alkaline ingredients isnāt a great idea even for humans, and itās worse for carnivores. If your kibble has āchicken + spinach + blueberry + sweet potato,ā donāt be shocked if your cat starts gassing the room or skipping the litter box.
Now, about the āmedicatedā food.
When clients come to me with a diarrhea issue, my first question is always: what are you feeding? Thatās common sense. But vets often go the long way: tests, antibiotics, special visits. Only when nothing works ā and the clientās wallet has been thoroughly milked ā they hand out a āprescriptionā food ā which, if you look closely, is often just a simpler, more stripped-down product.
For example, Royal Canin Hydrolyzed Rabbit (or HP):
ā one single protein source (rabbit or hydrolyzed soy),
ā no superfoods, fruits, grains or ābotanical blendsā,
ā no taste enhancers,
ā no 5-protein mixes in one bag.
Thatās it. The big secret. Itās just a basic, simplified diet ā labeled āprescriptionā and priced at $100 a bag. So to stop diarrhea, what your cat really needed wasnāt a miracle formula, but just food that made sense.
So maybe the issue isnāt that this is some magical treatment ā but that everything else is trash?
What should you do?
If your cat suddenly has diarrhea ā first, look at the food. Even a familiar brand can change the formula. Even a new batch of the āsameā kibble might be made from garbage-grade ingredients.
If it says āmeat + berriesā ā thatās a red flag. If the ingredient list is 25 items long ā be suspicious.
At our cattery, weāre switching more and more to fresh meat from local farms. We cook, cut, freeze ā yes, it takes time. But no surprises. And no diarrhea.
And finally, to any government folks reading this: please, can we get a Big Beautiful Bill for pets ā or at least their owners ā that makes healthy food accessible without needing a vet prescription or emotional breakdown? Or maybe just remove the poop-inducing fusion foods from the shelves altogether.
Just kidding. Kind of.
