Does Lactose Intolerance Cause Diarrhea?

Lactose intolerance is a common digestive disorder that occurs when the body is unable to fully digest lactose, the natural sugar found in milk and other dairy products. Here's how lactose intolerance can lead to diarrhea:

Undigested Lactose in the Colon: When someone with lactose intolerance consumes dairy foods, the undigested lactose reaches the colon.

Fermentation by Bacteria: The colon is home to various bacteria, some of which ferment the lactose that wasn't broken down in the small intestine.

Production of Gas and Short-Chain Fatty Acids: The fermentation process produces gas (including hydrogen, carbon dioxide, and methane) and short-chain fatty acids.

Increased Fluid in the Colon: The presence of undigested lactose, gas, and short-chain fatty acids draws water into the colon.

Diarrhea: The excess fluid in the colon causes diarrhea, which is characterized by frequent, watery bowel movements.

The severity of lactose intolerance and the resulting diarrhea can vary among individuals depending on the amount of lactose consumed and the individual's sensitivity to lactose. Some people may only experience mild symptoms, such as bloating and gas, while others may have more severe diarrhea, abdominal pain, and nausea.

If you suspect that you may be lactose intolerant, it's essential to consult with a healthcare professional for an accurate diagnosis and personalized dietary advice. They may recommend reducing or avoiding lactose-containing foods, choosing lactose-free dairy products, or taking enzyme supplements to help digest lactose.