The secretion of gastric acid is generally continuous and varies day and night, reaching its lowest level when you wake up in the early morning and starting again when food enters your stomach. Generally after sleep, no more food, the secretion rate of gastric acid decreases, when the stomach empties, the gastric acid secretion rate reaches the slowest, but the concentration reaches the highest, until the early morning before waking up, the concentration of gastric acid continues to decrease. Gastric acid is mainly secreted by the cells of the stomach lining, which is mainly regulated by the nerves and body fluids. When one starts to smell, see or eat food, it can stimulate the central nervous system, which in turn stimulates the lining cells to secrete gastric acid, making the level of gastric acid rise. Normally, you should pay attention to three meals on time, maintain the stability of the environment in the stomach, so as to achieve the purpose of protecting the gastric mucosa.