Feeling tired after eating may be caused by lack of sleep, insufficient blood supply to the brain and limbs, anemia and other factors. 1. Lack of sleep: If the patient does not have enough sleep, it may cause nerve dysfunction, resulting in feeling tired after eating, and may also cause headache, dizziness, muscle aches and pains and other symptoms. 2. Insufficient blood supply to the brain and limbs: After eating, a large amount of blood in the body will be concentrated in the digestive tract to help the digestive tract break down food and absorb food, which will easily lead to a relative lack of blood supply to the brain and limbs, which is mainly manifested as fatigue, dizziness and other symptoms. 3. Anemia: anemia also often leads to the phenomenon of feeling tired, severe anemia, including aplastic anemia, acute hemolytic anemia, acute hemorrhagic anemia, these patients are prone to the phenomenon of feeling tired after eating. The above are only some of the common causes. Patients who feel very tired after eating should go to the hospital in time, after clarifying the cause of the disease, under the guidance of the doctor to give appropriate treatment and therapy.