How do you achieve a state of "ketosis"?

Ketosis is a physiological state that occurs as the result of raised blood glucose levels. Low ketosis is normal, but high levels can be serious. High ketosis occurs when a person eats small amounts of protein and carbohydrates while eating large amounts of fat.

The body goes into a state of ketosis when fat must be broken down for energy. It is characterized by high levels of ketones in the blood. Ketone bodies are used by the body as a source of fuel. Initiating a state of ketosis can cause fat loss, but it also can be medically serious and cause a person to have acidic blood.