What causes slow digestion?

Slow digestion may be related to the following reasons: First, diet is unreasonable. If you usually eat foods that are not easy to digest, such as high-starch foods, sticky foods, etc., there will be delays in digestion after eating. Second, gastrointestinal motility is slow. Some people gastrointestinal motility is slow, digestion and absorption after eating will be slower, food residue in the intestine will stay longer, easy to appear constipation phenomenon. Third, gastrointestinal dysfunction. If you suffer from gastritis, gastric ulcer, gastric acid secretion and other diseases, leading to gastrointestinal dysfunction, there will also be slow digestion performance.