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My cat has hyperthyroidism and is losing weight. What diet helps?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 13 years old | 13 lbs

Yes, my cat was diagnosed with hyperthyroidism about 6-7 months ago. Although, he is on medication, I wanted to ask if there is any more preventive care that we can provide for him, such as diet, exercise, etc.? Aside from wanting to eat a bit more than usual and losing about 3 pounds since he was diagnosed, he looks and acts very "normal" however; we are very concern that he may be losing more weight. Can you help us? Thank you!!

1 Answer

Most Helpful Answer

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Answered By Dr. Heidi DVM, CVA, CCRT, CVTP, CVSMT, CVCH

Veterinarian, Certified Veterinary Acupuncturist, Certified Canine Rehabilitation Practitioner

Published on March 28th, 2018

If Rockie's thyroid level is controlled, then his weight should remain stable. There is a special diet for treating hyperthyroidism, but it is used instead of medication NOT in addition to treatment. I am attaching more information about it below. https://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=3348 If Rockie is still eating more than normal and losing weight, then his thyroid level may not be controlled yet, so it would be worth rechecking that blood value. You can certainly discuss a diet change with your veterinarian. If Rockie is on an adult food, he may do better on a senior food. And if he is on a dry food, he may do better on a canned food. Both of those changes may help him maintain his muscle mass. But I suspect that making sure his thyroid level is controlled should be your first step. Good luck! I hope that was helpful. Thanks for using PetCoach.

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