First 281 words of the document:
How is it caused:
Caused by a reduction in Lactase production in the process of growing up (childhood to
adulthood). Can also go to the extreme of no lactase production.
Facts/ extra information:
Isn't life threatening
It is manageable with the correct medication
The main difficulty with it is that sufferers will have to try and increase their calcium intake
another way as they cannot get it from milk products.
In babies condition is rare, but more serious. They're fed milk free products and rich calcium
and vitamin D products.
Lactase breaks down Lactose (from milk, glucose and galactose monosaccharide's).
The undigested lactose is broken down by microorganisms in the large intestine instead of
This produces a large volume of gas which causes diarrhoea, bloating, cramps and nausea.
Why does an individual who is lactose intolerant suffer from bloating/bloated intestines and
diarrhoea after drinking milk? (4 marks)
1. Milk contains lactose which is broken down by lactase.
2. People who are lactose intolerant do not produce enough lactase (in some cases the gene
may be switched off in adults).
3. Undigested lactose in the large intestine is broken down by microorganisms instead of by
the enzyme lactase because there isn't enough/any of it to glucose and galactose.
4. This produces a large volume of gas which causes discomfort, bloating and diarrhoea.
Diarrhoea is produced from lots of sugar in the large intestine (glucose) so the large intestine
draws in water via osmosis therefore the sufferer has watery faeces.