Western diet can put you at health risk - TOI Health Articles | June 15 Shaquem Griffin Womens Jersey , 2012 Certain saturated fats that are common in the modern Western diet can initiate a chain of events leading to complex immune disorders such as inflammatory bowel diseases (IBD) in people with a genetic predisposition, a new study has claimed.
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The findings of the new study help explain why once-rare immune-mediated diseases have become more common in westernized societies in the last half century.
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It also provides insights into why many individuals, who are genetically prone to these diseases, are never affected and how certain environmental factors can produce inflammation in individuals already at risk.
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Researchers at the University of Chicago found that concentrated milk fats, which are abundant in processed and confectionery foods Chris Carson Womens Jersey , alter the composition of bacteria in the intestines.
These changes can disrupt the delicate truce between the immune system and the complex but largely beneficial mix of bacteria in the intestines. The emergence of harmful bacterial strains in this setting can unleash an unregulated tissue-damaging immune response that can be difficult to switch off.
"This is the first plausible mechanism showing step-by-step how Western-style diets contribute to the rapid and ongoing increase in the incidence of inflammatory bowel disease," Eugene B. Chang, study author, said.
"We know how certain genetic differences can increase the risk for these diseases, but moving from elevated risk to the development of disease seems to require a second event which may be encountered because of our changing lifestyle Russell Wilson Womens Jersey ," he said.
For the study, the researchers worked with a mouse model that has many of the characteristics of human IBD.
Genetically deleting a molecule, interleukin 10, which acts as a brake on the immune system''s response to intestinal bacteria, caused about 20 per cent of mice to develop colitis when fed a low-fat diet or a diet high in polyunsaturated fats.
However Authentic Ugo Amadi Jersey , when exposed to a diet high in saturated milk fats, the rate of disease development within six months tripled, increasing to more than 60 per cent. In addition, the onset, severity and extent of colitis were much greater than that observed in mice fed low-fat diets.
Why would milk fat ? a powdered substance that remains when fat has been separated from butter and dehydrated ? trigger inflammation when polyunsaturated fat did not?
The researchers traced the answer to the gut microbiome Authentic Phil Haynes Jersey , the complex mix of hundreds of bacterial strains that reside in the bowels.
They found that an uncommon microbe called Bilophila wadsworthia was preferentially selected in the presence of milk fat. Previous studies had found high levels of B. wadsworthia in patients with?appendicitis?and other intestinal inflammatory disorders, including inflammatory bowel disease.
"That piqued our interest," Chang said.
"These pathobionts, which are usually non-abundant, seem to be quite prominent in these diseases Authentic Gary Jennings Jr. Jersey ," he said.
Indeed, while Bilophila wadsworthia levels were almost undetectable in mice on a low-fat or unsaturated-fat diet, the bacteria made up about 6 per cent of all gut bacteria in mice that were fed a high milk-fat diet.
"Here we show how the trend in consumption of Western-type diets by many societies can potentially tip the mutualistic balance between host and microbe to a state that favours the onset of disease," Chang said.
As its name implies, Bilophila wadsworthia has an affinity for bile Authentic Cody Barton Jersey , a substance produced by the liver and released into the intestines to help break down ingested fats.
Milk fats are particularly difficult to digest and require the liver to secrete a form of bile that is rich in sulfur. B. wadsworthia thrives in the presence of sulfur. So when the bile created to dissolve milk fats reaches the colon, it enables wadsworthia to blossom.
"Unfortunately, these can be harmful bacteria," Chang said.
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