Omega-6 vetzuren en darmontstekingen.*
Uit een Europese studie onder ruim 200.000 mensen in de leeftijd van 30-74 jaar blijkt dat hogere inname van omega-6
vetzuren in ruim 30% van de gevallen verantwoordelijk zijn voor het ontstaan van een
zwerende dikke darm.
Een zwerende dikke darm is aanleiding tot meer ziektes waaronder kanker van de
dikke darm. Uit hetzelfde onderzoek blijkt ook dat hogere inname van omega-3 vetzuren de kans op een zwerende dikke darm wel met 77% kan verminderen.
High N-6 Polyunsaturated Fat Intake May Be Implicated In Third Of Ulcerative Colitis Cases
A high intake of linoleic acid, a common dietary polyunsaturated fatty acid (N-6 PUFA), might be implicated in a third of ulcerative colitis cases, suggests research published ahead of print in Gut.
Ulcerative colitis is a painful chronic condition, in which the lining of the bowel becomes severely inflamed and blistered. It has been linked to other complications, including an increased risk of bowel cancer.
Linoleic acid is found in many dietary sources, including red meat, various cooking oils, and some margarines.
The researchers base their findings on food diaries (food frequency questionnaires) from more than 200,000 people, between the ages of 30 and 74 in the UK, Germany, Italy, Sweden and Denmark.
All the participants, who were taking part in the European Prospective Investigation into Cancer (EPIC) study, were matched with four comparison groups of people without ulcerative colitis, and monitored for the development of the
condition.
In all, 126 people developed ulcerative colitis after an average period of 4 years. Almost half the cases occurred in women (47%); the average age at diagnosis was 60.
After adjusting for other factors likely to influence the results, including smoking, age, total energy intake, and use of aspirin, those whose diets included the most linoleic acid were almost 2.5 times as likely to develop the condition as those whose diets contained the least.
If the association is causative, nearly a third of cases (30%) of ulcerative colitis could be attributable to high intakes of linoleic acid, suggest the authors.
Once in the body, linoleic acid is converted to arachidonic acid, which is a component of the cell membranes in the bowel.
Arachidonic acid can then be converted into various inflammatory chemicals, high levels of which have been found in the bowel tissue of patients with ulcerative
colitis.
The research also found that the highest intake of omega 3 fatty acid (docosahexanoic acid), found in oily fish such as salmon and herring, reduced the likelihood of developing ulcerative colitis by 77%.
"Linoleic acid, a dietary n-6 polyunsaturated fatty acid, and the aetiology of ulcerative colitis: a nested case-control study with a European prospective cohort study"
Online First Gut 2009; doi 10.1136/gut.2008.16908
Source
GUT
(Augustus
2009)
