As your ketone levels increase, your doctor may think you are about to have ketoacidosis — a potentially lethal condition. As long as you are on the ketogenic diet, however, this will almost never be the case.
Ketoacidosis occurs when the body produces too many ketones, making the blood overly acidic.
The common consensus in the scientific community is that the main underlying cause of ketoacidosis is insulin deficiency. Insulin deficiency can result from being born without the ability to produce enough insulin (type 1 diabetes), living a lifestyle that promotes insulin resistance (type 2 diabetes), or after repeated bouts of intense chronic stress.
By following the ketogenic diet, you will help improve insulin efficiency and produce ketones in a healthy way. This is because restricting carbs reduces insulin resistance and blood sugar levels to the point that the body will prevent ketones from building up so much that they become dangerous.
For a more comprehensive look at ketoacidosis, check out this article.