It is unscientific to eat only one meal a day. First, eating too little meal a day is easy to be malnourished. Second, eating only one meal a day, in the morning or at noon, will cause long-term hunger at other times, which will do great harm to the stomach, such as nausea, heartburn and acid reflux. And it is easy to get gastric ulcer. Third, malnutrition, after a long time, the body's absorption of nutrients will be reduced, and the resistance will drop, which is prone to hypoglycemia and dizziness, and even some people will have repeated colds and fever. Fourth, if women only eat one meal a day, it will cause serious diseases such as endocrine disorders and irregular menstruation in the long run. Eating only one meal a day for a long time will not have a good weight loss effect, because people have a physical defense mechanism. After eating a meal, fat will accumulate, accelerate the digestion of food and reduce the basal metabolic rate. Instead, it is easy to gain weight.