What's the importance of preventive care for cats?

From Pet Health Network, "My Cat is Perfectly Healthy: Why Should I See a Vet?"

This is a question we're asked often, and the article does a good job answering it. The "early disease detection" aspect is REALLY important, especially because cats are prone to a few different chronic diseases (renal insufficiency and hyperthyroidism, for example) that can be treated much more effectively with early detection.