If you feel weak after eating, it is usually caused by the following factors: 1. The most common factor is cardiovascular disease, especially circulatory system diseases. After eating, the blood around the body is all distributed in the digestive tract, especially in the gastrointestinal tract, to help digest and absorb food. In this case, the amount of blood returned to the heart is seriously inadequate, and the diaphragm will be raised to compress the coronary artery blood supply, so the coronary artery will be obviously incomplete, and the body will feel weak after eating on top of the original coronary artery disease. 2, when there is cerebrovascular disease, the whole body will also feel weak after eating, usually because of insufficient blood supply to the vertebrobasilar artery. 3, when there is hyperlipidemia and hyperviscosity, after eating, a transient hyperlipidemia, the blood will be too high. In case of hyperlipidemia and hyperviscosity, the clinical manifestation of generalized weakness is caused by a transient hyperlipidemia, a decrease in blood flow and blood flow rate.