Steatitis, commonly known as Yellow Fat Disease, is defined as a painful inflammation of the adipose (fat) tissue in the body. The fat tissue itself becomes hardened, lumpy, and takes on a characteristic yellow-orange color due to the deposition of pigment (ceroid).
In the context of the Chronic Kidney Disease (CKD) cat, this condition is almost exclusively nutritional. It is caused by a diet that is high in unsaturated fatty acids and low in Vitamin E (an antioxidant). This typically happens when well-meaning owners, desperate to get a finicky CKD cat to eat, feed them a diet consisting almost entirely of red tuna or certain other oily fish without proper supplementation. The excess fatty acids oxidize and turn rancid within the body's fat stores because there isn't enough Vitamin E to protect them.
The primary clinical sign is extreme hypersensitivity. The cat may seem fine until they are picked up or petted, at which point they cry out in pain or act aggressively because their skin feels bruised and tender. Owners may feel firm, painful lumps under the skin. Treatment involves correcting the diet immediately, supplementing with Vitamin E, and often using corticosteroids to manage the severe inflammation.
Disclaimer: This content is for educational purposes only and does not constitute veterinary medical advice. Always consult with your primary care veterinarian or a veterinary internal medicine specialist regarding your cat’s specific condition.