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  1. Lactose - Wikipedia

    Lactose is a disaccharide composed of galactose and glucose, which form a β-1→4 glycosidic linkage. Its systematic name is β- D -galactopyranosyl- (1→4)- D -glucose.

  2. What Is Lactose? - Cleveland Clinic Health Essentials

    Oct 29, 2024 · Lactose is a natural, complex sugar produced in all mammalian milk that’s difficult to breakdown unless you have lactase, a protein, in your small bowel.

  3. Lactose intolerance - Symptoms & causes - Mayo Clinic

    Sep 22, 2025 · Lactose intolerance is a condition that makes it hard to digest the sugar in milk and milk products, called lactose. People with lactose intolerance often have diarrhea, gas and bloating after …

  4. 5 Foods High in Lactose to Avoid - WebMD

    Sep 15, 2024 · Lactose is a sugar naturally found in dairy products like milk, butter, yogurt, and more. Learn which 5 foods to avoid for lactose intolerance.

  5. Lactose is a sugar found in some dairy products. Lactase is an enzyme in the gut that is needed to break down lactose. Many adults have trouble digesting foods with lactose because their level of …

  6. Lactose | Milk Sugar, Digestion & Nutrition | Britannica

    Mar 9, 2026 · Lactose, carbohydrate containing one molecule of glucose and one of galactose linked together. Composing about 2 to 8 percent of the milk of all mammals, lactose is sometimes called …

  7. Definition & Facts for Lactose Intolerance - NIDDK

    Learn about lactose intolerance, a condition in which you have symptoms—such as bloating, diarrhea, and gas—after you consume foods or drinks that have lactose.

  8. Lactose Intolerance: Symptoms, Diagnostic Tests & Treatment

    Begin with a lactose-free diet, then gradually reintroduce lactose-containing foods to see how your system responds. Some people with lactose intolerance can tolerate up to 12 grams (g) of lactose at …

  9. What Is Lactose? - IFIC

    May 6, 2024 · Lactose is sometimes referred to as “milk sugar” because it is only found naturally in the milk of mammals—including cows, goats and humans. Milk from cows and goats is used to make …

  10. Lactose Intolerance - Johns Hopkins Medicine

    Lactose is a sugar found in milk and milk products. Lactose intolerance happens when your small intestine does not make enough of a digestive juice (enzyme) called lactase.