Does blood rush to stomach after eating?

After eating, blood flow does indeed increase to the stomach and intestines to aid in the process of digestion. This physiological response is known as postprandial hyperemia, which refers to the enhanced blood flow to the gastrointestinal tract following a meal.

Immediately after eating, the body's "rest-and-digest" response gets activated, leading to increased blood flow to the stomach, gallbladder, and pancreas, enhancing the production and secretion of digestive juices and enzymes. The increased blood flow to the digestive system helps support the process of breaking down the food and absorbing essential nutrients.

This process is regulated by the nervous and hormonal systems. The vagus nerve, part of the parasympathetic nervous system, plays a role in stimulating blood flow to the stomach and intestines. Additionally, hormones such as gastrin and cholecystokinin (CCK) are released in response to food consumption and also contribute to the regulation of digestive processes, including the increase in blood flow to the digestive organs.

Interestingly, the redistribution of blood flow after a meal can cause a temporary decrease in blood flow to other parts of the body, which can lead to feelings of drowsiness and reduced physical performance, commonly referred to as post-meal dip or post-lunch drowsiness. This is why it's often recommended to take a short walk or engage in light activity after a meal to help with digestion and maintain energy levels.