Taken from NHS website
What is Lactose intolerance?
Lactose is a natural sugar that is found in milk. Lactose intolerance occurs when the body is unable to break down lactose and cannot absorb it into the blood. This can cause symptoms such as:
- a bloated stomach
- flatulence (wind)
- diarrhoea
Lactose
Lactose is found in the milk of mammals, including cows, goats, and sheep, and it is also added to many foods. Foods that contain lactose include:
- dairy products, such as cream, cheese, and yoghurt
- biscuits and chocolate
- some breakfast cereals
As well as being a good source of energy, lactose helps the body to absorb a number of minerals, such as calcium and magnesium.
Lactose intolerance
Lactose intolerance occurs when the body cannot break down and absorb lactose. It is usually caused by the lack of an enzyme, called lactase, which is produced by the small intestine. Enzymes are proteins that cause chemical reactions to occur.
If there is not enough lactase, the lactose cannot be absorbed and it passes into the colon (the large intestine), where it begins to cause symptoms.
How common is lactose intolerance?
It is estimated that around 15% of adults in the UK have lactose intolerance.
Outlook
Lactose intolerance can range from mild to severe, depending on how much lactose a person has in their diet and how well their body can digest it.
Lactose intolerance cannot be prevented. However, the condition’s symptoms can be reduced by avoiding certain foods that contain lactose.
