Lactose is a disaccharide sugar found naturally in dairy products like milk. It is composed of two sugar molecules, glucose and galactose. Lactose is the primary carbohydrate in milk and is responsible for its slightly sweet taste. In the digestive system, lactose is broken down into its constituent sugars by an enzyme called lactase, which is produced in the small intestine. People who are lactose intolerant have low levels of lactase and may experience digestive discomfort, such as bloating, gas, and diarrhea, after consuming dairy products.

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