High levels of ketones with acidity in the blood is called ketoacidosis. The excess acidity in the blood is dangerous to the whole body. . The body can control blood acidity up to a point, but too much acid overcomes this and the acidity rises. The result is vomiting, loss of water and minerals (sodium and potassium) and a major biochemical upset in the body. Ketoacidosis is a medical emergency needing urgent hospital treatment.