http://medicalxpress.com/news/2014-10-g ... -role.htmlHow gut bacteria ensures a healthy brain – and could play a role in treating depressionby Clio Korn
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http://www.gutmicrobiotawatch.org/--------------------------------------------
http://www.theguardian.com/science/2014 ... e-medicine I had the bacteria in my gut analysed. And this may be the future of medicine
Andrew Anthony sent his stool off to have its bacteria sequenced. In the future, such techniques could help assess our susceptibility to conditions from diabetes, Parkinson's and Alzheimer's to autism, depression and cancer
Andrew Anthony
Andrew Anthony
But there was plenty of evidence of high fibre, which is good because bacteria feed on fibre. If we don't feed bacteria, they feed off us – specifically the mucus lining in our large intestine
Sarcopenia means loss of muscle mass. It happens as we get older because the body becomes less efficient at turning protein into muscle, which is why older people need to have more protein. "We think that the narrowing of gut bacteria in old people is making the intestine less efficient at absorbing proteins," says O'Toole.
Common to all these issues, particularly among the aged, is the narrowing of the gut microbiota which, in turn, is usually the result of a narrowing of diet. This is a point that O'Toole repeatedly emphasises.
"Diversity is the key. What we see with people on narrow diversity diets is that the microbiota collapses. A good analogy would be an ecosystem like a rainforest, where you've got loads of plants and animals interacting. It's evolved over tens of thousands of years, then one of the key species, a tree, gets cut down and you get ecological collapse.
"And if you had a gentleman whose wife died and she had done all the cooking, and then he's suddenly eating toast and marmalade, the diversity of gut microbiota will collapse – because diversity of diet correlates with diversity of microbiota – and y
Tooth decay
An early coloniser of teeth, Streptococcus mutans is one of 25 species of oral streptococci to live in the oral cavity.
Normally they cause few problems, turning sucrose into a "glue" to cohere to teeth, helping to form dental plaques. However, if S. mutans is given other types of sugar – glucose, fructose or lactose, for example – in addition to the plaques, it also starts producing lactic acid.
While dental plaques comprise hundreds of species of bacteria, it is this combination of lactic acid and plaque caused by S. mutans that is a primary cause of tooth decay.
Type 2 diabetes
It is already known that type 2 diabetes can be caused by a number of genetic and environmental components, but recent research has shed some light on a possible microbial element. It was found that patients with type 2 diabetes had lower rates of butyrate-producing bacteria, an important food for cells lining the colon.
It was also found that there was a clear relationship between people with type 2 diabetes and the specific species of bacteria found in their gut. This association is so great that the analysis of gut microbiomes can be used as a diagnostic test for type 2 diabetes.
Cancer
While chronic infection of H. pylori has been known to increase the risk of stomach cancer by four to six times, it is now becoming clearer that other bacteria may have a role to play in increasing or decreasing a person's susceptibility to other forms of cancer. A study of 70,000 individuals showed that patients with periodontitis – inflamed and bleeding gums due to poor oral hygiene – had double the risk of cancers of the oral cavity and digestive tract. The risk of cancer rose with increasing severity of periodontitis and was specifically associated with the oral bacterium Porphyromonas gingivalis.