At present, we can determine whether to enter the ketogenic state through clinical manifestations, urine ketone test paper, blood ketone meter and other ways. 1. Clinical manifestations: after entering the ketogenic state, patients will have increased urination, decreased appetite, dry mouth, thirst, bad breath, weight loss and other manifestations. 2. Urine ketone test paper: through the detection of morning urine, and then compare the color card to determine the amount of urine ketones to roughly determine the content of urine ketone bodies. 3. Breathing ketone test paper: through the detection of acetone content in the breath gas, can also be a preliminary judgment of the amount of ketone bodies, this method is more accurate than the urine ketone test paper. 4. Blood ketone meter: you can also use the instrument to detect the B-hydroxybutyric acid (BHB) in the blood to judge, this way is currently the most accurate method. For those who lose weight through ketogenic diet, the above ways can be used to assess whether the organism has entered the ketogenic state, but it should be noted that ketogenic weight loss may have adverse reactions such as hypoglycemia, so it needs to be carried out under the guidance of a doctor.