This group of patients follows the "Dietary Guidelines for Chinese Residents (2022)" to ensure balanced nutrition, with daily calorie intake ranging from 1600 to 2400 kcal.

the patients ate ketogenic biscuits or ketogenic foods provided by the researchers every day. During the study, the patients were not allowed to drink any drinks or eat other foods except drinking water, so as to ensure that the daily intake of calories was roughly the same as that of the normal diet group.

the patients took 7 days as a cycle, and 7 days of strict ketogenic diet+7 days of normal diet as a cycle. During the strict ketogenic diet, the patient should eat the ketogenic biscuit or ketogenic food provided by the researcher every day, and should not drink any beverage or eat other food except drinking water; During the normal diet period, patients followed the "Dietary Guidelines for Chinese Residents (2022)" to ensure nutritional balance. During the study period, patients were guaranteed to eat approximately the same amount of calories per day as the normal diet group.

Patients choose ingredients for cooking and consumption under the guidance of researchers, ensuring that the nutritional composition is about 90% fat, 10% protein, and can contain a small amount of carbohydrates (10%). The daily calorie intake is around 1600~2400 kcal.

the patients ate ketogenic biscuits or ketogenic foods provided by the researchers every day. During the study, the patients were not allowed to drink any drinks or eat other foods except drinking water, so as to ensure that the daily intake of calories was roughly the same as that of the normal diet group.