Showing posts with label health. Show all posts
Showing posts with label health. Show all posts

Saturday, November 07, 2009

Babies 'cry in mother's tongue'

Page last updated at 10:38 GMT, Friday, 6 November 2009

Babies 'cry in mother's tongue'

Crying newborn
Babies' cries imitate their mother tongue as early as three days old

German researchers say babies begin to pick up the nuances of their parents' accents while still in the womb.

The researchers studied the cries of 60 healthy babies born to families speaking French and German.

The French newborns cried with a rising "accent" while the German babies' cries had a falling inflection.

Writing in the journal Current Biology, they say the babies are probably trying to form a bond with their mothers by imitating them.

FROM THE TODAY PROGRAMME

The findings suggest that unborn babies are influenced by the sound of the first language that penetrates the womb.

Cry melodies

It was already known that foetuses could memorise sounds from the outside world in the last three months of pregnancy and were particularly sensitive to the contour of the melody in both music and human voices.

Earlier studies had shown that infants could match vowel sounds presented to them by adult speakers, but only from 12 weeks of age.

Kathleen Wermke from the University of Wurzburg, who led the research, said: "The dramatic finding of this study is that not only are human neonates capable of producing different cry melodies, but they prefer to produce those melody patterns that are typical for the ambient language they have heard during their foetal life.

Newborns are highly motivated to imitate their mother's behaviour in order to attract her and hence to foster bonding
Kathleen Wermke, Unversity of Wurzburg

"Contrary to orthodox interpretations, these data support the importance of human infants' crying for seeding language development."

Dr Wermke's team recorded and analysed the cries of 60 healthy newborns when they were three to five days old.

Their analysis revealed clear differences in the shape of the infants' cry melodies that corresponded to their mother tongue.

They say the babies need only well-co-ordinated respiratory-laryngeal systems to imitate melody contours and not the vocal control that develops later.

Dr Wermke said: "Newborns are highly motivated to imitate their mother's behaviour in order to attract her and hence to foster bonding.

"Because melody contour may be the only aspect of their mother's speech that newborns are able to imitate, this might explain why we found melody contour imitation at that early age."

Debbie Mills, a reader in developmental cognitive neuroscience at Bangor University, said: "This is really interesting because it suggests that they are producing sounds they have heard in the womb and that means learning and that it is not an innate behaviour.

"Many of the early infant behaviours are almost like reflexes that go away after the first month and then come back later in a different form.

"It would be interesting to look at these babies after a month and see if their ability to follow the melodic contours of their language is still there."

Saturday, April 25, 2009

Medics 'can mend a broken heart'

Page last updated at 11:07 GMT, Friday, 27 March 2009

Medics 'can mend a broken heart'

Broken heart
Medics can help you recover from a broken heart

Scientists have found it is possible to mend a broken heart.

US researchers studied 70 patients with "broken heart syndrome", a recognised condition linked to stressful or emotional events.

All these patients recovered, most after being given aspirin or heart drugs, even though 20% were deemed critically ill.

The American Journal of Cardiology study says the condition is probably caused by a surge in stress hormones.

Broken heart syndrome, known medically as Takotsubo cardiomyopathy, was first described by Japanese researchers in the early 1990s.

Even though symptoms mimic those of a heart attack such as chest pain and shortness of breath, broken heart syndrome does appear to be temporary and completely reversible - if treated quickly.

The patients studied by the researchers from two hospitals in Providence, Rhode Island were diagnosed with broken heart syndrome between July 2004 and April 2008.

Spring breaks

Around 67% of patients had been exposed to some sort of physical or emotional distress - such as bad news about a family member, a domestic argument, severe physical illness or a car accident - just before the onset of symptoms.

There does seem to be an association between this condition and a very stressful event
June Davison, British Heart Foundation

Six patients presented with heart-induced shock and three had abnormal heart rhythms which required emergency treatment.

Two-thirds of the patients - almost all post-menopausal women - had experienced a very stressful physical or emotional event just before arriving at the hospital with heart attack-like symptoms.

Overall, the majority of those in the registry were prescribed aspirin or heart drugs such as, beta blockers, ACE inhibitors and statins while in hospital.

Even though a fifth were were critically ill and required emergency treatment to keep them alive, all the patients survived the first 48 hours and experienced a full recovery.

The researchers also discovered that, unlike heart attacks which tend to occur in winter, broken heart syndrome cases tend to occur in the spring and summer months.

'Rarely fatal'

Dr Richard Regnante from the Miriam Hospital, who led the research, said this seasonal pattern could help understand the condition.

"Some believe it is simply a form of a heart attack that 'aborts' itself early and therefore doesn't leave any permanent heart muscle damage.

HAVE YOUR SAY
A broken heart just needs time to digest the pain and get back on track with the help of friends, relatives and some shopping
Maeth P, UK

"Others say that the syndrome has nothing to do with the coronary arteries and is simply a problem with the heart muscle.

"Since the seasonal pattern of broken heart syndrome that we observed is opposite of what it seen with heart attack patients, our findings suggest - but certainly do not prove - the latter theory may be correct."

He added that the study could help heart specialists and A&E doctors manage patients with the condition.

"Although there is much we're still learning about broken heart syndrome, we do know that it is rarely fatal as long as patients are fully supported with medications, respirators and other critical devices in the first 48 hours."

Dr Regnante and his team are now recruiting patients with broken heart syndrome for a new study which will use ultrasound images to look at whether the condition causes internal damage to the heart.

June Davison, a spokeswoman for the British Heart Foundation, said: "There does seem to be an association between this condition and a very stressful event.

"But not enough people have been affected to provide hard evidence of what happens and what actually causes it.

"However people do seem to make a full recovery."

Wednesday, November 05, 2008

Helping the dying with living

Nov 5, 2008
THE ST INTERVIEW
Helping the dying with living
Instead of discussing euthanasia, the focus should be on helping terminally ill live with less pain, says expert
By Radha Basu, Senior Correspondent
Dr Shaw with Ms Joyce Neo Soh Hoon, 54, at St Joseph's Home and Hospice. Communicating with the dying can be taught and learnt, Dr Shaw believes. Often, what doctors need to do is simply to listen. -- ST PHOTO: JOYCE FANG
Dr Rosalie Shaw, 70, is executive director of the Asia Pacific Hospice Palliative Care Network, which helps develop services for the terminally ill in Asia. She is also a consultant at the National Cancer Centre and a visiting consultant at the KK Women's and Children's Hospital.

EUTHANASIA is the wrong conversation to have in a nation concerned with dying with dignity.

The focus instead should be on care - how to help the terminally ill live with less pain, says Dr Rosalie Shaw, a palliative care specialist who has helped hundreds here live out their last days over the past 16 years.

'Euthanasia is not about allowing the terminally ill to die with dignity and without distress,' asserts the Australian, who moved to Singapore from Perth in 1992 to help set up hospice care here. 'That is what palliative care does. Instead, it is an act with the intention to kill.'

As a consultant at the National Cancer Centre and visiting consultant at KK Women's and Children's Hospital, she tends to the terminally ill. As executive director of the Asia Pacific Hospice Palliative Care Network, she helps train doctors and nurses in end-of-life care all over Asia.

Weighing in on the euthanasia debate, which was sparked off here when Health Minister Khaw Boon Wan raised the issue last month in response to letters on euthanasia in the Chinese press, she says most terminally ill people do not really want to die.

Yet, once every few months, a patient asks her for help to end it all. 'When people ask to die, what they really mean is, 'Do you know how difficult this is?',' she says.

The plea is usually a cry for help. 'As their bodies break down, they hope that they will not linger long, but they don't expect doctors to do anything but listen.'

Her zeal in opposing euthanasia resonates with that of Catholic Archbishop Nicholas Chia who last weekend called on his flock, including Catholic doctors, to reject euthanasia.

Dr Shaw declines to discuss her religion, saying it is a 'private matter'. The grounds on which she opposes euthanasia are both professional and personal, she says. As a doctor taught to heal or cure, the 'intent to kill' is anathema.

Listening to hundreds of terminally ill people has taught her that the wish to die is not always due to physical pain. Very often, distress is made more acute by mental turmoil - caused by social isolation, depression, anxiety or sorrow.

Dr Shaw has distilled 16 years' worth of experience caring for the dying here into a book, Soft Sift In An Hourglass, now available in book stores.

It offers haunting portraits of how different people face the inevitable.

There is the unmarried violin player dying of bowel cancer, still in love with the married man she spent one weekend with 30 years earlier.

There is the frail housewife with two young children, angry at leaving the world before her time.

'The book is not meant to be didactic,' she says. 'It merely opens windows into issues we must all confront some day.'

While no two people face death exactly the same way, she has noticed broad similarities.

Such as how the dying often lose their appetite as their organs shut down, yet their families continue to force-feed them in the hope that they will recover.

And how some embrace religion before death, hoping for a miraculous recovery, but feel let down by God as death closes in on them anyway.

Often, those who have the hardest time accepting death are successful men in their 50s and 60s 'who seem surprised that wealth cannot buy health'.

In general, she has found that most people cling to life, rather than want to end it.

Studies bear this out. One by Melbourne University's palliative care professor David Kissane examined cases of seven cancer patients who had sought euthanasia when the practice was made legal for eight months between 1996 and 1997 in Australia's Northern Territory.

'It showed that some people asked for euthanasia not because death was imminent, but because they found life intolerable,' she says.

Singapore, she says, should not be taking a short cut and legalising this form of killing. 'A society that allows euthanasia devalues life,' she maintains.

Sanctioning it could pressure the elderly and terminally ill to want to end their lives. They may feel compelled to 'shuffle off' so they do not become burdens to society.

It could lead society down a slippery slope to involuntary euthanasia, where others make such choices for patients no longer able to decide for themselves. The Netherlands, where euthanasia has been legal since 1984, has reported many cases of involuntary euthanasia.

Dr Shaw warns that doctors may also be inclined to take the easy way out when they are unable to control difficult symptoms. And families may make decisions on behalf of patients who are unconscious or have dementia.

What Singapore should work on instead, she feels, is improving end-of-life care.

Currently, home hospice services reach nearly three in four cancer patients here. But for non-cancer patients, such care is limited. Only about one in four patients who died last year had subsidised hospice care.

The network of home care services for the elderly is also limited. Both need to be broadened.

Back home in Victoria, Dr Shaw's father had heart disease, diabetes, arthritis and prostate cancer. Yet he lived alone. His meals were brought to him and his home was cleaned by state-subsidised home care professionals.

'He loved the people who came. We need more of that here,' she says.

Keeping the elderly out of hospitals and nursing homes would not only make them happier, but could be cheaper too.

At the same time, doctors need to be better trained both in how to control symptoms such as pain, and how to help the gravely ill face death.

Often, young doctors are reluctant to discuss openly with patients how little time they have left.

'They interpret death from their own perspective,' she says. 'Because they are not ready, they feel their patients may not be.'

During a training course she conducted, a young doctor asked how he could avoid lying to his patients.

Dr Shaw's reply: 'Often, what is required is not for doctors to talk but to listen.'

Communicating with the dying is an art which can be taught and learnt, she believes.

Some doctors ramp up treatments during their patients' last days, even though it is futile, because they do not know any other way to help. 'They don't have the heart to explain how ineffective the treatment is likely to be.'

But explaining that, and stopping the treatment, may prove liberating.

Just last week, one of her patients was told by a cancer specialist that she had reached a stage where neither chemotherapy nor radiation was likely to work.

'It was like a cloud of confusion had lifted. Now she knew what to do - go home, eat just what she wanted and enjoy life,' said Dr Shaw.

Not all patients, however, like to discuss death or say their last goodbyes. Dr Shaw's own mother, who died of heart disease in 1991, was reticent till the end.

'When I asked her how she was feeling, she said she did not want to talk about it. But she was prepared and had sorted out all her drawers. We have to be sensitive to what patients want.'

Either way, listening is key.

When a patient in great pain asked for help to end her life some years ago, Dr Shaw asked why.

The woman revealed that she had never told her husband - or anyone else - that their child was actually fathered by another man.

'All I did was listen. All she did was cry,' Dr Shaw recalls. 'And the pain just melted away.'

The woman died three days later, unburdened and at peace.

Wednesday, October 29, 2008

Internet use 'good for the brain'

Page last updated at 15:00 GMT, Tuesday, 14 October 2008 16:00 UK

Internet use 'good for the brain'

Brain activity in an experienced internet user when carrying out simple reading task
Areas activated by reading a book in the brain of an experienced web user

For middle-aged and older people at least, using the internet helps boost brain power, research suggests.

A University of California Los Angeles team found searching the web stimulated centres in the brain that controlled decision-making and complex reasoning.

The researchers say this might even help to counteract the age-related physiological changes that cause the brain to slow down.

The study features in the American Journal of Geriatric Psychiatry.

A simple, everyday task like searching the web appears to enhance brain circuitry in older adults
Professor Gary Small
University of California Los Angeles

As the brain ages, a number of changes occur, including shrinkage and reductions in cell activity, which can affect performance.

It has long been thought that activities which keep the brain active, such as crossword puzzles, may help minimise that impact - and the latest study suggests that surfing the web can be added to the list.

Brain activity in an experienced internet user when searching the web
Web use stimulates much more activity in the same brain

Lead researcher Professor Gary Small said: "The study results are encouraging, that emerging computerised technologies may have physiological effects and potential benefits for middle-aged and older adults.

"Internet searching engages complicated brain activity, which may help exercise and improve brain function."

The latest study was based on 24 volunteers aged between 55 and 76. Half were experienced internet users, the rest were not.

Compared with reading

Each volunteer underwent a brain scan while performing web searches and book-reading tasks.

Both types of task produced evidence of significant activity in regions of the brain controlling language, reading, memory and visual abilities.

However, the web search task produced significant additional activity in separate areas of the brain which control decision-making and complex reasoning - but only in those who were experienced web users.

Brain activity in a personal not used to using the web while reading
Brain activity in web newcomers: similar for reading and internet use

The researchers said that, compared to simple reading, the internet's wealth of choices required people to make decisions about what to click on in order to get the relevant information.

However, they suggested that newcomers to the web had not quite grasped the strategies needed to successfully carry out a web search.

Professor Smith said: "A simple, everyday task like searching the web appears to enhance brain circuitry in older adults, demonstrating that our brains are sensitive and can continue to learn as we grow older."

Rebecca Wood, chief executive of the Alzheimer’s Research Trust, said: "These fascinating findings add to previous research suggesting that middle-aged and older people can reduce their risk of dementia by taking part in regular mentally stimulating activities.

"Older web users - 'silver surfers' - are doing precisely this.

"Frequent social interactions, regular exercise and maintaining a balanced diet can also reduce dementia risk."

Dr Susanne Sorensen, head of research at the Alzheimer's Society, said: "Use it or lose it may well be a positive message to keep people active but there is very little real evidence that keeping the brain exercised with puzzles, games or other activities can promote cognitive health and reduce the risk of dementia."

Friday, December 21, 2007

Humour 'comes from testosterone'

Last Updated: Friday, 21 December 2007, 00:17 GMT
Humour 'comes from testosterone'
laughter
Genetics may underlie humour
Men are naturally more comedic than women because of the male hormone testosterone, an expert claims.

Men make more gags than women and their jokes tend to be more aggressive, Professor Sam Shuster, of Norfolk and Norwich University Hospital, says.

The unicycling doctor observed how the genders reacted to his "amusing" hobby.

Women tended to make encouraging, praising comments, while men jeered. The most aggressive were young men, he told the British Medical Journal.

Previous findings have suggested women and men differ in how they use and appreciate humour.

Women tend to tell fewer jokes than men and male comedians outnumber female ones.

Aggressively funny

Research suggests men are more likely to use humour aggressively by making others the butt of the joke.

And aggression - generally considered to be a more masculine trait - has been linked by some to testosterone exposure in the womb.

Professor Shuster believes humour develops from aggression caused by male hormones.

He documented the reaction of over 400 individuals to his unicycling antics through the streets of Newcastle upon Tyne.

Almost half of people responded verbally - more being men. Very few of the women made comic or snide remarks, while 75% of the men attempted comedy - mostly shouting out "Lost your wheel?", for example.

Mocking and sneering

Often the men's comments were mocking and intended as a put-down. Young men in cars were particularly aggressive - they lowered their windows and shouted abusively.

This type of behaviour decreased among older men however, who tended to offer more admiring comments, much like the women.

"The idea that unicycling is intrinsically funny does not explain the findings," said Professor Shuster.

The simplest explanation, he says, is the effect of male hormones such as testosterone.

And initial aggressive intent seems to become channelled into a more subtle and sophisticated joke, so the aggression is hidden by wit, claims Professor Shuster.

Dr Nick Neave is a psychologist at the University of Northumbria who has been studying the physical, behavioural, and psychological effects of testosterone.

He suggested men might respond aggressively because they see the other unicycling man as a threat, attracting female attention away from themselves.

"This would be particularly challenging for young males entering the breeding market and thus it does not surprise me that their responses were the more threatening."

Monday, October 15, 2007

Look of fear sparks fast reaction

Last Updated: Sunday, 14 October 2007, 04:56 GMT 05:56 UK
Look of fear sparks fast reaction
Male face showing fear
Individuals respond most quickly to a fearful expression
A look of horror will grab the attention of those around you faster than a smile, US research shows.

Individuals react more quickly to a fearful expression than to faces showing other emotions such as joy, a study in the journal Emotion found.

Researchers from Vanderbilt University found the same speedy reaction to fear when only the eyes were visible.

It is thought the brain has evolved to react more quickly to potentially threatening situations

The brain responds very quickly to all facial expressions - at a speed of less than 40 milliseconds.

So to assess if certain emotions prompt a faster reaction, the researchers had to slow down the speed at which volunteers became aware of facial expressions.

Male face showing joy
A happy face prompted the slowest reaction time

Volunteers looked through a viewer which flashed a black and white, quick-changing pattern to one eye and a static image of a face to the other eye.

The flashing image had the effect of slowing down the speed at which the individual noticed the face.

Quick response

Participants became aware of a fearful expression far faster than a neutral or happy face.

Reaction to happy faces was consistently slower than for the other expressions looked at.

The fast reaction to fear was the same if the whole face was visible or just the eyes.

It is thought an area of the brain called the amygdala can process simple visual signals bypassing the normal visual processing pathway.

Dr David Zald, associate professor of psychology at Vanderbilt University in Nashville, Tennessee said: "We believe that the brain can detect certain cues even before we are aware of them, so that we can direct our attention to potentially threatening situations in our environment."

Male face showing a neutral expression
Neutral expressions also produced slower responses than fear

He added there was other evidence showing the eyes were an important part of the picture.

"Fearful eyes are a particular shape, where you get more of the whites of the eye showing.

"That may be the sort of simple feature that the amygdala can pick up on, because it's only getting a fairly crude representation."

He added that the brain may react to happy faces slowly because they signal safety and do not require immediate attention.

The team are now planning to do a similar study to look at the response to anger.

Dr Bahador Bahrami, associate researcher in the UCL Institute of Cognitive Neuroscience in London said the findings were very interesting but not unexpected.

"It's quite well accepted that fearful faces have a special significance.

"And other imaging studies have shown the brain responds more strongly to fear, so this is consistent with that finding."

Wednesday, August 29, 2007

PNG Aids victims 'buried alive'

Last Updated: Monday, 27 August 2007, 15:35 GMT 16:35 UK
PNG Aids victims 'buried alive'
Woman walks by an Aids awareness billboard in PNG - 18/08/07
Raising awareness of HIV/Aids in PNG is a difficult task
Some people with HIV/Aids in Papua New Guinea are being buried alive by their relatives, a health worker says.

Margaret Marabe said families were taking the extreme action because they could no longer look after sufferers or feared catching the disease themselves.

Ms Marabe said she saw the "live burials" with her own eyes during a five-month trip to PNG's remote Southern Highlands.

PNG is in the grip of an HIV/Aids epidemic - the worst in the region.

Officials estimate that 2% of the six million population are infected, but campaigners believe the figure is much higher.

HIV diagnoses have been rising by around 30% each year since 1997, according to a UN Aids report.

Ignorance

Margaret Marabe, a known local activist in PNG, carried out an awareness campaign in the Tari area of the Southern Highlands earlier this year.

"I saw three people with my own eyes. When they got very sick and people could not look after them, they buried them," she told reporters.

Map

She described how one person called out "mama, mama" as the soil was being shovelled over their head.

Villagers told her that such action was common, she said.

HIV/Aids is mostly spread in the country through heterosexual intercourse, and polygamy, rape and sexual violence are widespread.

Those caught up in the epidemic are often thought to be the victims of witchcraft.

Women accused of being witches have been tortured and murdered by mobs holding them responsible for the epidemic, according to officials and researchers.

Church leaders have described Aids patients being thrown off bridges or left to starve in back gardens in the past, the BBC's Phil Mercer in Sydney reports.

Ms Marabe, who works for the Igat Hope organisation in the capital, Port Moresby, said people in remote parts of the country remained ignorant about HIV/Aids and urged the government to take action.

"There are no voluntary counselling training centres in Tari. There are also no training programmes on HIV," she was quoted by PNG's Post-Courier newspaper as saying.

PNG's Secretary for Health Dr Nicholas Mann admitted to the BBC in an interview last year that the multitude of cultures and languages in the country made it difficult to get the HIV/Aids message across.

But he said Prime Minister Sir Michael Somare had brought the issue under his remit, and the government was working with agencies on a co-ordinated approach to tackling the crisis.

Monday, August 13, 2007

Coffee may help relieve gym pain

Coffee may help relieve gym pain
Coffee beans
Moderate amounts of coffee could help reduce post-exercise soreness
Drinking coffee could help reduce the post-workout pain that puts many people off exercise, a small study suggests.

The study found moderate doses of caffeine, roughly equivalent to two cups of coffee, can cut muscle pain by up to 48%.

But researchers at the University of Georgia warned their findings may not be applicable to regular caffeine users who are less sensitive to its effects.

The report was published in The Journal of Pain.

The researchers studied nine female college students who were not regular caffeine users and did not engage in regular strength-building training.

One or two days after an exercise session that caused moderate muscle soreness, the volunteers took either caffeine or a placebo and performed thigh exercises.

Volunteers that consumed caffeine had a 48% reduction in pain compared to the placebo group when performing maximum force thigh exercise, and a 26% reduction in sub-maximal force exercises.

Lead author Victor Maridakis said: "If you can use caffeine to reduce pain, it may make it easier to transition from that first week into a much longer exercise program."

Professor Patrick O'Connor who co-authored the study said caffeine may work to reduce pain by blocking the body's receptors for adenosine, a chemical released in response to inflammation.

Caffeine molecule
Caffeine may alleviate pain by blocking adenosine receptors

Limitations

The researchers warned there were limitations to their findings though.

For example, the small size of the study means it will need to be replicated on a larger scale, and the findings may not be applicable to regular coffee users, or to men.

The researchers recommended that people are cautious about using caffeine before a workout, as too much caffeine can cause side-effects such as jitteriness and sleep disturbance.

Mr Maridakis said: "It can reduce pain, but you have to apply some common sense and not go overboard."

We should not get too excited just yet
Zoe Wheeldon

Greg Whyte, a physiologist at the British Association of Sport and Exercise Science, said the soreness felt after exercise is normal and actually a sign that muscles are responding to the exercise.

He said if caffeine is merely reducing the symptoms but not the underlying causes of the pain then it could be useful, but as it can have a diuretic effect it "may cause other problems" after exercise when rehydration is important.

He added that the muscle soreness could also be helped by methods such as stretching, ice-bathing or massage.

More research

Zoë Wheeldon, spokesperson for the British Coffee Association said coffee has been shown in many studies to increase drinkers' capacity to exercise harder and for longer.

But on the new research she said: "This is very interesting, but we should not get too excited just yet and we would like to see more research."

She said the small size of the study in particular meant the results should not yet be extrapolated, for instance to regular coffee users.

However she added that there were many health benefits to drinking moderate amounts of coffee, as it is a source of antioxidants, improves alertness and performance, and can be used to aid sports training.

Coffee 'protects female memory'

Coffee 'protects female memory'
Cup of coffee
Coffee is known to act on the brain
Caffeine may help older women ward off mental decline, research suggests.

French researchers compared women aged 65 and older who drank more than three cups of coffee per day with those who drank one cup or less per day.

Those who drank more caffeine showed less decline in memory tests over a four year period.

The study, published in the journal Neurology, raises the possibility that caffeine may even protect against the development of dementia.

It might be that caffeine could slow the dementia process
Dr Karen Ritchie
French National Institute for Health and Medical Research

The results held up even after factors such as education, high blood pressure and disease were taken into account.

Caffeine is a known psychostimulant, but this study appears to suggest its effects may be more profound.

However, lead researcher Dr Karen Ritchie of the French National Institute for Health and Medical Research warned against jumping to premature conclusions.

She said: "While we have some ideas as to how this works biologically, we need to have a better understanding of how caffeine affects the brain before we can start promoting caffeine intake as a way to reduce cognitive decline.

"But the results are interesting - caffeine use is already widespread and it has fewer side effects than other treatments for cognitive decline, and it requires a relatively small amount for a beneficial effect."

The study, which involved 7,000 women, did not find that caffeine consumers had lower rates of dementia.

Women 'more sensitive'

Dr Ritchie said: "We really need a longer study to look at whether caffeine prevents dementia; it might be that caffeine could slow the dementia process rather than preventing it."

She said it was not clear why the protective effect did not seem to apply to men.

"Women may be more sensitive to the effects of caffeine. Their bodies may react differently to the stimulant, or they may metabolize caffeine differently."

Rebecca Wood, chief executive of the Alzheimer's Research Trust, said that with no cure for Alzheimer's disease yet available, research into possible protective factors was important, particularly as the disease is expected to become more common.

She said: "This study does not suggest that caffeine actually lowers rates of dementia in women, but since memory seems improved, it may be that it is slowing it down.

"However, research over a much longer period is still needed to establish fully what the affects of caffeine are in both men and women and whether it could reduce a person's risk of dementia or slow down its progress."

Dr Susanne Sorensen, head of research at the Alzheimer's Society, said drinking coffee and tea had both been tipped as possible ways of delaying the onset of dementia.

However, she said: "These types of studies are complex because coffee and tea drinking can be linked to so many other social and life style factors."

Girl overdoses on espresso coffee

Girl overdoses on espresso coffee
A teenager was taken to hospital after overdosing on espresso coffee.

Jasmine Willis, 17, developed a fever and began hyperventilating after downing seven double espressos while working at her family's sandwich shop.

The student, of Stanley, County Durham, was taken to the University Hospital of North Durham, where doctors confirmed she had overdosed on caffeine.

She has since made a full recovery and is now warning others about the dangers of excessive coffee drinking.

Ms Willis, who had thought the coffees were single measures, said the effects were so severe that she began laughing and crying for no reason while serving customers at the shop.

I was having palpitations, my heart was beating so fast and I thought I was going into shock
Jasmine Willis

She developed a fever and began struggling to breathe after being sent home by her father.

"My nerves were all over the place.

"I was drenched. I was burning up and hyperventilating.

"I was having palpitations, my heart was beating so fast and I thought I was going into shock.

"I did not realise this could happen to you and I only hope other people learn from my mistake."

The teenager, who was allowed home after a few hours of observation, suffered side effects for days afterwards and now says she cannot stand the sight of coffee.

Her father Gary, who runs The Sandwich Bar in Stanley, said: "She did not realise she was drinking double measures.

"I have always stressed to my children the importance of moderation but Jasmine got caught out on this occasion."