Eating only one meal a day can cause gastrointestinal disorders, hypoglycemia, anemia and malnutrition. Under normal circumstances, it takes about 1~4 hours for food to be completely digested in the stomach and intestines, about 1~2 hours for liquid type of fluid food, and about 3~4 hours for solid type of hard food. If you eat only one meal a day, the stomach will be in a state of gastric emptying for a long time, and it is easy to produce too much gastric acid to stimulate and damage the gastric mucosa, causing gastrointestinal dysfunction. In addition, eating only one meal a day is difficult to take in enough nutrients needed by the body for a day, which may lead to weight loss, malnutrition, anemia and so on. In addition, eating only one meal a day may also lead to hypoglycemia. In addition to the above, eating only one meal a day may also lead to gallbladder stones and endocrine disorders due to prolonged fasting. It is recommended to eat regularly and not to be too hungry or too full.