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Lactose intolerance is a common digestive problem where the body is unable to digest lactose, a type of sugar mainly found in milk and dairy products. The symptoms of lactose intolerance will occur after consuming food or drink that contains lactose, such as dairy products.
The main symptoms include:
The severity of your symptoms and when you begin to experience them will depend on the amount of lactose that you have consumed.
The amount of lactose that it takes to cause your symptoms will vary from person to person. For example, some people may still be able to drink a small glass of milk without triggering any symptoms, while others may not even be able to have milk in their tea.
Intolerance is not the same as a food allergy. If you’re allergic to something, even a tiny particle can be enough to trigger a reaction, while most people with lactose intolerance can still consume small amounts of lactose with no ill-effects. What causes lactose intolerance?
The body digests lactose by using an enzyme called lactase to break down lactose into two simpler sugars called glucose and galactose, which can then be easily absorbed into the bloodstream. Enzymes are proteins that cause chemical reactions to occur.
In cases of lactose intolerance, the body does not produce enough of the lactase enzyme so lactose stays in the digestive system, where it is fermented by bacteria (in the same way that yeast is fermented to produce beer). It’s this fermentation process that causes the symptoms associated with lactose intolerance.
Levels of lactase often fall as people grow older and some health conditions can also reduce the production of lactase. Diagnosing lactose intolerance
Many experts are concerned that people wrongly “self-diagnose” as lactose intolerant and miss out on the nutrients that dairy product provide.
Similarly, many parents wrongly assume they have passed the condition on to their children, where this may not actually be the case. Treating lactose intolerance
Limiting your intake of food and drink containing lactose is the main treatment for lactose intolerance.
Depending on a person’s levels of intolerance, they may also require additional calcium and vitamin D supplements to keep the bones strong and healthy.
Advice from a dietitian may sometimes be helpful in determining the best diet for a person.
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Who is affected ?
Levels of lactose intolerance can differ between different ethnic groups. For example, iti s thought that only 1 in 50 people of Swedish descent have some degree of lactose intolerance where as almost all people of Chinese descent have the condition.
In the UK, it’s more common in people of Asian or African-Carribean descent.
Most cases first develop in people aged 20 to 40, although in rare cases the intolerance can be present at birth. Both sexes are equally affected by lactose intolerance. Outlook
It can be difficult at first to assess how much lactose you can eat without ill effects.But usually, with time, a person learns to “judge their own limits” and work out what they can eat and drink without it causing symptoms.
Complications such as osteoporosis, caused by a lack of nutrients in the diet, can usually be avoided with advice from a GP or dietitian on whether food supplements are required.