A ketogenic diet usually refers to a diet structure that is very low in carbohydrates, moderate in protein and high in fat. Ketogenic foods are accordingly foods that are relatively low in carbohydrates and relatively high in fats with some protein. Ketogenic food is commonly used in patients with epilepsy, glucose carrier deficiency, pyruvate dehydrogenase deficiency and obesity. By simulating the environment in which the body produces ketone bodies through a diet low in carbohydrates, high in fats and a certain percentage of proteins, ketogenic food can increase the speed and quantity of ketone body production in the body, and achieve the purpose of treating the disease. It should be noted that ketogenic food is not suitable for everyone, porphyria, carnitine deficiency, pyruvate carboxylase deficiency and other patients should avoid the use of ketogenic food; and when the consumption of ketogenic food symptoms such as hypoglycemia, lethargy, nausea and vomiting, you should consult a doctor. Patients who need ketogenic diet to treat diseases should be guided by professional doctors and avoid ketogenic diet on their own to avoid serious complications.