The most common reason for not being able to eat, nausea and lack of energy is due to improper diet, or unhygienic diet, leading to acute gastroenteritis. Due to the damage to the mucous membrane of the gastrointestinal tract and the dysfunction of gastrointestinal peristalsis, there will be dyspepsia, weakened gastrointestinal peristalsis, loss of appetite, nausea, and many other symptoms. Due to the reduction of food intake, there will be a lack of energy, with inability to eat, nausea, lack of energy, not accompanied by obvious symptoms of vomiting, diarrhea or fever and other infections, you can take drugs to promote gastrointestinal peristalsis, such as morphine, mosapride, itopride and so on. You can take drugs to protect the gastric mucosa, such as magnesium aluminum carbonate tablets, aluminum thioglycollate suspension, etc. Pay attention to a good diet, eat less spicy stimulation or cold food.