1. People frequently exposed to lead: The lactose in milk can promote the absorption and accumulation of lead in the human body, easily leading to lead poisoning. Therefore, people who are frequently exposed to lead should not drink milk and can switch to yogurt, as yogurt contains very little lactose, most of which has been converted to lactic acid.
2. People with lactose intolerance: Some people have a severe deficiency of lactase in their bodies, which means the lactose in the milk they consume cannot be converted to galactose and glucose for absorption and utilization by the small intestine. Instead, it goes directly to the large intestine, increasing the osmotic pressure in the intestinal cavity and causing the intestinal mucosa to absorb a large amount of water. In addition, when lactose is fermented by bacteria in the intestine, it can produce lactic acid, lowering the intestinal pH value to below 6, thereby stimulating the large intestine and causing symptoms such as bloating, abdominal pain, flatulence, and diarrhea.
3. People allergic to milk: Some people experience symptoms such as abdominal pain and diarrhea after drinking milk. In severe cases of allergy, symptoms like rhinitis, asthma, or urticaria may even occur.
4. Patients with reflux esophagitis: Milk has the effect of reducing the pressure of the lower esophageal sphincter, which increases the reflux of gastric or intestinal juice, aggravating esophagitis.
5. Patients after abdominal or gastric surgery: The patient's lactase levels can be affected and reduced. After drinking milk, undigested lactose will ferment in the body, producing water, lactic acid, and a large amount of carbon dioxide, causing the patient to become bloated. During abdominal surgery, the intestines are exposed to the air for a long time, and the mesentery is stretched, which delays the recovery of postoperative intestinal motility. Gas produced from swallowing or fermentation in the intestinal cavity cannot be expelled in time, which worsens bloating, leading to abdominal pain, increased intra-abdominal pressure, and even the bursting of suture sites or the opening of the abdominal incision. After gastric surgery, the remaining gastric pouch is very small, and milk containing lactose will quickly rush into the small intestine, making the already insufficient or deficient lactase even more insufficient or deficient.
6. Patients with Irritable Bowel Syndrome (IBS): This is a common functional intestinal disease characterized by abnormal physiological responses of intestinal muscle movement and intestinal mucous secretion to stimulation, without any structural damage to the intestine. Symptoms are mainly related to psychological factors and food allergies, including allergies to milk and its dairy products.
7. Patients with cholecystitis and pancreatitis: Digesting the fat in milk requires bile and pancreatic enzymes. Milk increases the burden on the gallbladder and pancreas, which in turn exacerbates the symptoms.
8. People who usually experience symptoms such as bloating, excessive flatulence, abdominal pain, and diarrhea: Although these symptoms are not caused by milk, drinking milk can worsen them.