Research overview: hypersomatotropism and acromegaly in diabetic cats

A substantial proportion of diabetic cats, particularly those with difficult-to-control or insulin-resistant diabetes, have underlying hypersomatotropism, excess growth hormone from a pituitary tumor, causing acromegaly. The resulting insulin resistance drives high insulin requirements and characteristic physical changes. Recognition of this link reshaped the workup of resistant feline diabetes, with measurement of insulin-like growth factor 1 used for screening and treatments including pituitary radiation or hypophysectomy. This overview compiles the endocrinology literature rather than one source, describing how growth hormone excess antagonizes insulin, why acromegaly is underrecognized among diabetic cats, and how diagnosing and treating it can transform glycemic control. It matters because identifying acromegaly explains otherwise puzzling insulin resistance and opens targeted treatment for affected cats.