It s a natural state after fasting or exercise. The diet forces it to be your normal state. Ketoacidosis is a dangerous condition associated with Type 1 diabetes. It has nothing to do with ketogenic diets. Testing for ketosis is not the objective.
Weight loss is.
There are no studies showing a low carbohydrate diet can actually cause kidney damage. Control of insulin is the basis of all low carb diets. By forcing the body to burn fats for fuel you waste calories. The ketotic state also reduces your appetite and your calorie intake goes down. It is the husk of a grass.