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Hungry stomach hormone promotes growth of new brain cells [Copy link] 中文

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Post time 2017-4-28 15:12:31 |Display all floors
(By Clare Wilson from Newscience)--
A stomach hormone that stimulates appetite seems to promote the growth of new brain cells and protect them from the effects of ageing – and may explain why some people say that fasting makes them feel mentally sharper. When ghrelin was first discovered, it became known as the hunger hormone. It is made by the stomach when it gets empty, and whenever we go a few hours without food its levels rise in our blood. But there is also evidence that ghrelin can enhance cognition. Animals that have reduced-calorie diets have better mental abilities, and ghrelin might be part of the reason why. Now Jeffrey Davies at Swansea University, UK, and his team have found further evidence that ghrelin can stimulate brain cells to divide and multiply, a process called neurogenesis.  

New memories
If the same effect happens in animals, this could be how ghrelin exerts its effects on memory, says Davies. Young brain cells are thought to enhance the ability to form new memories. This is because they are more excitable, so are more likely to be activated by new environments.
The work may also have implications for treating neurodegenerative conditions, such as Parkinson’s disease, which is caused by a loss of a type of brain cell. Previous research, including some by Davies’s team, has found that ghrelin can help protect animals from developing a form of Parkinson’s disease.

Intermittent fasting
In people, going on a permanent diet of about 25 per cent fewer calories than the daily recommended amount has several benefits to health, such as better control of blood sugar levels. Some who try it have said it also improves their cognitive abilities, although this is controversial – some studies have suggested it impairs people’s mental abilities. But Nicolas Kunath of the Technical University of Munich, Germany, points out that new brain cells take a few days to weeks to start working, so people shouldn’t expect fasting to produce immediate effects on their brainpower in this way.

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Post time 2017-6-6 05:09:31 |Display all floors
That is intresting if true

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