Why do you feel tired when the weather changes?

This is a normal physiological phenomenon of human beings. The reason is that after the hot weather, the body's blood vessels dilate, resulting in a decrease in blood volume, a relative lack of blood supply to the brain, cerebral ischemia and hypoxia, so dizziness, lethargy, fatigue and so on appear. Especially after lunch, the demand for blood in the stomach increases and I want to sleep more! The human body should have an adaptation process to the changes of the external environment. However, everyone's adaptation time is different. If you want to adapt as soon as possible, it is recommended to exercise more at ordinary times, but the situation may be more serious some time before exercise. This is normal. Just stick to it for a while. Diet should be light, eat more fruits and vegetables, and less greasy. Besides, don't eat too much!