Formation of ketone bodies in general is a normal during a long fast or starvation. I would call this ketosis. Ketone bodies are water-soluble derivatives of fatty acids that were stored as triacylglycerols. Ketoacidosis, for example, results from type I diabetes, and is a state in which ketone bodies are produced despite a person's eating a normal diet. The acidosis means that the pH of blood is low, sometimes dangerously low. Ketoacidosis can sometimes be seen in type II diabetes, but my understanding is that it is less common. I would not classify diabetes as solely a disorder of carbohydrate metabolism, because insulin affects many metabolic pathways.