I found this on the NHS website:
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.
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.