What Causes Lactose Intolerance?

TL;DR

Lactose intolerance is caused by a deficiency in the enzyme lactase, leading to an inability to digest lactose, resulting in various digestive symptoms.

Transcript

Lactose intolerance is simply the body’s inability to digest lactose. Lactose is a disaccharide, or a molecule made up of two types of sugars, in this case, glucose and galactose. Most people have an enzyme (a protein molecule that breaks down other molecules) lactase in their digestive systems. This enzyme breaks down lactose into glucose and gala... Read More

Key Insights

• 🥺 Lactose intolerance is caused by a deficiency in the enzyme lactase, leading to undigested lactose and digestive symptoms.
• 🫢 Symptoms of lactose intolerance include abdominal pain, gas, diarrhea, nausea, and bloating.
• 🥺 Lactose is primarily digested in the small intestine, and if undigested, it ferments in the large intestine, leading to symptoms.
• 🤔 Primary lactase deficiency develops slowly over time and is thought to be influenced by genetics.
• 🛩️ Secondary lactase deficiency can occur due to illness or injury affecting the small intestine or lactase production.
• ❓ Common causes of secondary lactase deficiency include chemotherapy, celiac disease, and Crohn's disease.
• ❓ Lactose intolerance symptoms can vary in severity depending on the individual and the amount of lactose consumed.

Questions & Answers

Q: What is lactose intolerance?

Lactose intolerance is a condition where the body lacks the enzyme lactase, which is responsible for breaking down lactose. As a result, lactose remains undigested and causes various digestive symptoms.

Q: What are the symptoms of lactose intolerance?

Symptoms of lactose intolerance include abdominal pain, gas, diarrhea, nausea, and bloating. These symptoms occur when undigested lactose reaches the large intestine, leading to fermentation and the production of fatty acids.

Q: How does the digestive system process lactose?

Lactose is primarily broken down by the enzyme lactase in the small intestine. If lactose is not fully digested in the small intestine, it reaches the large intestine, where bacteria further ferment it, leading to symptoms of lactose intolerance.

Q: What causes lactase deficiency?

There are two types of lactase deficiencies. Primary lactase deficiency occurs after the age of two when the body produces less lactase. It is thought to be inherited from parents. Secondary lactase deficiency is caused by injury or illness affecting the small intestine or the body's ability to produce lactase.

Summary & Key Takeaways

• Lactose intolerance occurs when the body lacks the enzyme lactase, which is responsible for digesting lactose.

• Symptoms of lactose intolerance include abdominal pain, gas, diarrhea, nausea, and bloating.

• The digestive system breaks down food in different parts, with lactose primarily being digested in the small intestine, and if undigested, it ferments in the large intestine.