This is what i saw on nhs direct.....
Maybe a bit misleading?
Ketosis - Definition
Ketosis is a process in which your body converts fats into energy. During the conversion, ketones are produced as a by-product. Ketones can give your breath a sweet, fruity smell that may be mistaken for alcohol.
Your body normally uses glucose to meet its energy needs. Glucose comes from the carbohydrate in your diet. A healthy, balanced diet should provide you with all the glucose your body needs, so that ketosis does not take place. However, if your body does not have enough glucose, perhaps because your diet is very low in carbohydrates or you are starving yourself, it will begin ketosis to obtain energy from its stored fats instead. As a result of this, the ketone levels in your blood will rise. Prolonged severe ketosis can be dangerous as it can change the acidity of your blood, which may eventually lead to serious damage to your liver and kidneys.
Recently, diets that recommend you eat lots of protein and very little carbohydrate have become popular. These high-protein, low-carbohydrate diets, known as ketogenic diets, are intended to work by forcing your body to begin ketosis to burn fats and create quick weight loss. Because long periods of ketosis can be dangerous to your kidneys and liver, ketogenic diets are never recommended by health professionals for more than short-term use, typically no longer than 14 days. Many nutritionists warn their patients, especially women in the early stages of pregnancy, against following them at all.
Ketoacidosis in diabetics
If you are diabetic and fail to have your insulin injections for a long period, you may experience ketoacidosis.
The lack of insulin means that your body cannot use glucose in your blood to create energy, and ketosis occurs. The resulting high blood glucose levels also lead to dehydration as your body attempts to remove excess glucose by passing more urine. This in turn affects the level of electrolytes in your body.
If left untreated, your body will release so many ketones into your blood that your blood will quickly become dangerously acidic. Together with unbalanced electrolyte levels and dehydration, untreated diabetic ketoacidosis can lead to coma and death.