Ketosis is a metabolic process characterized by burning stored fat and increased levels of ketone bodies, acid produced by the liver. This is a result of a diet which is very low in carbohydrates, ketogenic diet. However, there is also a pathological level of ketosis; for example, those with diabetes may experience ketoacidosis, a lethal condition characterized by very high levels of ketones that the blood become too acidic. In ketoacidosis, vital organs such as the liver, kidneys, and brain may be damaged. Some of the indications that you are undergoing ketosis are weight loss, increased thirst, better focus and concentration, changes in sleeping patterns, fatigue, bad breath, and headaches. When using a ketogenic diet it is extremely important to stay well-hydrated to minimize the danger of damage to the kidneys and liver.