Dr. Lisa Pierson's seminal essay on feline hyperthyroidism - inspired by her deep dive into claims made by Hill's about their y/d diet which purports to "restore thyroid health" in cats - is a highly recommended read for anyone considering a veterinarian's recommendation to feed that food for a cat with hyperthyroidism.
I think you'll be glad you took the time to read what Dr. Pierson uncovered in her very careful dissection of the diet's claims.
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Soy contains plant estrogens (phytoestrogens), which may cause harm to a cat's thyroid gland. Many pet food manufacturers use soy to add bulk and a relatively inexpensive source of protein. According to Dr. Lisa Pierson, "Given how common hyperthyroidism is in the cat, soy has no business being in cat food."
SO WHAT? If you're feeding commercial food, look for animal-based, rather than plant-based, sources of protein for your carnivore.
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