Final answer:
Diabetic cats tend to lose weight due to loss of body fluids, resulting from insulin resistance that leads to the utilization of body fat and proteins for energy, producing ketone bodies and causing increased urination (polyuria) and dehydration.
Step-by-step explanation:
Diabetic cats tend to lose weight primarily due to loss of body fluids and the breakdown of body fat and protein. When a cat is diabetic, it experiences insulin resistance or insufficient insulin production, resulting in high blood sugar levels or hyperglycemia.
Due to the cells' inability to utilize glucose effectively, the body starts to break down fats, leading to the production of ketone bodies. These ketone bodies require large amounts of ions and water, which leads to increased urination (polyuria) and subsequent weight loss.
Furthermore, the high concentration of glucose in the blood causes osmotic diuresis, which leads to dehydration and further weight loss. Optimal treatment may involve a combination of a low carbohydrate diet, insulin therapy, and other diabetes-controlling medications. It is important to manage this condition to prevent complications such as nerve damage, kidney damage, and cardiovascular issues.