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Lactose intolerance is a common condition that affects millions of people worldwide. It occurs when the body has difficulty digesting lactose, the sugar found in milk and dairy products. Understanding the symptoms and causes of lactose intolerance can help individuals manage their diet and improve their quality of life.
What Is Lactose Intolerance?
Lactose intolerance is a digestive disorder caused by a deficiency of lactase, an enzyme produced in the small intestine. Lactase breaks down lactose into simpler sugars, glucose and galactose, which are absorbed into the bloodstream. Without enough lactase, lactose remains undigested, leading to various gastrointestinal symptoms.
Symptoms of Lactose Intolerance
- Stomach pain and cramping
- Gas and bloating
- Diarrhea
- Nausea
- Occasional vomiting
Symptoms typically appear 30 minutes to 2 hours after consuming dairy products. The severity can vary depending on the amount of lactose ingested and the level of lactase deficiency.
Causes of Lactose Intolerance
- Primary Lactose Intolerance: The most common form, which develops gradually as people age and produce less lactase.
- Secondary Lactose Intolerance: Caused by injury or illness affecting the small intestine, such as Crohn’s disease or celiac disease.
- Congenital Lactose Intolerance: A rare genetic condition present from birth, where infants are born with little or no lactase.
Many populations around the world have varying levels of lactose tolerance, often influenced by genetic and cultural factors. For example, Northern Europeans tend to have higher lactase persistence, while East Asian populations often have lower levels.
Managing Lactose Intolerance
Individuals with lactose intolerance can manage their symptoms by adjusting their diet. Common strategies include:
- Limiting or avoiding dairy products
- Using lactose-free dairy alternatives
- Taking lactase supplements before consuming dairy
- Consuming fermented dairy products like yogurt and kefir, which contain less lactose
Consulting a healthcare professional or a registered dietitian can help create a suitable dietary plan and ensure balanced nutrition.