Category: Dementia

New early warning test for dementia developed.

Scientists now think they can detect dementia before the symptoms appear by using a special type of MRI brain scan technique.

The new test — which uses arterial spin labelling — relies on measuring the blood flow in a certain portion of the brain.

The test is sorely needed because early diagnosis of dementia is very important to effective therapies.

The number of people worldwide affected by dementia is currently at over 35 million, and those numbers are expected to double over the next 15 years.

The study which supports the use of this new test included 148 elderly people, around half of whom went on to develop signs of dementia over almost two years (Xekardaki et al., 2014).

Amongst those who later deteriorated, there was reduced blood flow in certain key areas of the brain, as measured at the start of the research.

In particular, reduced flow (or perfusion) was seen in the posterior cingulate cortex, an area in the middle of the brain which is active when our minds are not concentrating on anything specific.

Dr. Sven Haller, one of the study’s authors, said:

“There is a known close link between neural activity and brain perfusion in the posterior cingulate cortex.

Less perfusion indicates decreased neural activity.”

The reason that some people do not notice any symptoms of dementia, despite reduced flow, is that other areas of the brain are able to take up the slack.

The brain has a remarkable ability to recruit its cognitive reserves to make up for deficits caused by age or injury, but only up to a point.

Eventually the cognitive reserves are exhausted and the patient begins to notice some of the classic signs of dementia, like memory loss.

The test of blood flow in this area of the brain may prove a cheap and effective way of spotting these changes before the symptoms become obvious.

Currently PET scans are used to try and spot early signs of dementia, but these expose patients to radiation and are not as easy to administer.

The big 5 lifestyle factors and more ways of preventing dementia.

By 2050 there could be as many as 16 million Americans living with Alzheimer’s disease, the most common form of dementia.

Some of the most frequent early symptoms of Alzheimer’s are short-term memory loss, getting lost and problems finding words.

Later on it can lead to mood swings, confusion, long-term memory loss and a withdrawal from friends and family.

Whilst there is no cure, there are a number of lifestyle and dietary factors that have been associated with preventing dementia.

(Click the links for details of each study.)

1. Keep the brain active

Traditional pastimes like cards and doing puzzles may help to increase brain volume, according to new research presented at the Alzheimer’s Association International Conference 2014.

In the study, along with a brain scan, 329 middle-aged people were surveyed to see how cognitively active they were: how much they played games, read books, went to museums and so on.

The results showed that people who played the most games — like crosswords, checkers, cards and puzzles — also had the largest brain volume.

Stephanie Schultz, the study’s lead author said:

“Our findings suggest that, for some individuals, engagement in cognitively stimulating activities, especially those involving games such as puzzles and cards, might be a useful approach for preserving brain structures and cognitive functions that are vulnerable to Alzheimer’s disease.”

2. Avoid being cynical

People with high levels of cynicism are more likely to develop dementia, according to a new study published in the medical journal Neurology.

In the study, conducted in Finland, 1,449 people were given tests of their cynicism that included questions like:

• “I think most people would lie to get ahead.”
• “It is safer to trust nobody.”
• “Most people will use somewhat unfair reasons to gain profit or an advantage rather than lose it.”

Eight years later, people who were high on cynical distrust were three times more likely to develop dementia than those low on that measure.

3. Take Vitamin E

Two recent studies provide evidence of the protective effects of Vitamin E against both mild to moderate Alzheimer’s disease and age-related memory problems.

Dr. Mary Sano, author of one of the trails, explained:

“This trial showed that vitamin E delays progression of functional decline by 19% per year, which translates into 6.2 months benefit over placebo.”

The study’s authors think that vitamin E can be recommended as standard clinical practice.

A second study carried out in Finland found that higher levels of vitamin E in the blood seemed to protect against memory disorders.

4, 5, 6, 7 & 8. The big five lifestyle factors

The big five lifestyle factors are the ones you’ve heard many times before, especially in relation to heart disease.

They apply to dementia just the same:

4. Take regular exercise.
5. Don’t smoke.
6. Maintain a low body weight.
7. Eat a healthy diet.
8. Low alcohol intake.

A 35-year study recently revealed that people who followed four or five out of these five healthy habits had 60% lower levels of dementia and cognitive decline with ageing.

Adopting just one of these healthy habits reduced the rate of dementia by one-quarter.

Exercise provided the largest protective effect against cognitive decline and dementia.

Dr Doug Brown, of the Alzheimer’s Society, commenting on the study, said:

“We have known for some time that what is good for your heart is also good for your head, and this study provides more evidence to show that healthy living could significantly reduce the chances of developing dementia.”

9. Take Vitamin D

Low levels of Vitamin D are substantially associated with developing Alzheimer’s and dementia in older people, according to the best study conducted so far.

The study, published in the journal Neurology, found that amongst those who had dementia, those low in Vitamin D were 53% more likely to develop the disease.

Amongst those who were severely deficient, the risk increased by 125%.

Similar increases in risk were seen for Alzheimer’s disease: low levels of vitamin D increased risk by 69% and severe deficiency by 122%.

10. Avoid sugar

Otherwise healthy people with high blood sugar levels are more likely to have memory problems, according to a recent study published in the journal Neurology.

This is not the first study to link higher levels of blood glucose with smaller brain structures, particularly the hippocampus.

Studies of those with type 2 diabetes and those with problems absorbing glucose have linked it with higher rates of Alzheimer’s and dementia.

The authors suggest sugar may have a toxic effect on the brain, particularly in its memory centres:

“Direct “toxic” effects of glucose on neuronal structures include disturbances of intracellular second messenger pathways, imbalance in the generation and scavenging of reactive oxygen species, or advanced glycation of important functional and structural proteins in the brain.”

Could playing games — both traditional and video games — help protect against Alzheimer’s disease?

Traditional pastimes like cards and doing puzzles may help to increase brain volume, according to new research presented at the Alzheimer’s Association International Conference 2014.

The findings build on previous studies which have linked playing video games to larger brain structures.

Stephanie Schultz and colleagues at two Alzheimer’s research institutes in Wisconsin examined 329 middle-aged people who did not currently have dementia, but many of whom were at risk because of their family history.

Along with a brain scan, they were surveyed to see how cognitively active they were: how much they played games, read books, went to museums and so on.

The results showed that people who played the most games — like crosswords, checkers, cards and puzzles — also had the largest brain volume.

Schultz said:

“Our findings suggest that, for some individuals, engagement in cognitively stimulating activities, especially those involving games such as puzzles and cards, might be a useful approach for preserving brain structures and cognitive functions that are vulnerable to Alzheimer’s disease.”

More detailed studies of specific cognitive activities, including games, would help further our understanding of how an active, healthy lifestyle may help delay the development of Alzheimer’s.”

Because of the design of this study we can’t tell if playing games is really affecting brain size.

For example, it may be that people with larger brains happen to play more games.

Super Mario

However, there is other research that has linked game-playing with larger brain volumes.

In a study published last year, German researchers had people playing video games for 30 minutes a day over 2 months (Kühn et al., 2013).

Their brain volumes were then compared with a control group.

People who’d been playing the game (Super Mario 64) had larger grey matter structures in areas of the brain associated with memory, spatial navigation, strategic planning and fine motor skills.

The study’s lead author, Simone Kühn, explained:

“While previous studies have shown differences in brain structure of video gamers, the present study can demonstrate the direct causal link between video gaming and a volumetric brain increase.

This proves that specific brain regions can be trained by means of video games.”

Image credit: JD Hancock

New test for disease which affects 115 million people around the world.

A set of 10 blood proteins which reliably predict the onset of Alzheimer’s has been identified by a new study.

It could lead to a relatively cheap and non-invasive test for the disease within a few years.

At the moment the early stages of Alzheimer’s can be difficult to tell apart from the normal ageing process, until it is too late.

Only around 10% of older people with mild cognitive impairment go on to develop dementia within a year.

One of the study’s authors, Professor Simon Lovestone, explained:

“Alzheimer’s begins to affect the brain many years before patients are diagnosed with the disease.

Many of our drug trials fail because by the time patients are given the drugs, the brain has already been too severely affected.

A simple blood test could help us identify patients at a much earlier stage to take part in new trials and hopefully develop treatments which could prevent the progression of the disease.”

The new test, which could be available within two years, can predict the onset of Alzheimer’s in the next year with 87% accuracy.

This would enable drugs to be prescribed earlier and likely improve outcomes.

Finding the right proteins

The study used blood samples from 1,148 people (Hye et al., 2014).

Some had Alzheimer’s, others a mild cognitive impairment and some were elderly controls without dementia.

By analysing the blood samples, they found 10 proteins that could predict the progression from mild cognitive impairment to Alzheimer’s.

The study’s lead author, Dr Abdul Hye, said:

“Memory problems are very common, but the challenge is identifying who is likely to develop dementia.

There are thousands of proteins in the blood, and this study is the culmination of many years’ work identifying which ones are clinically relevant.

We now have a set of 10 proteins that can predict whether someone with early symptoms of memory loss, or mild cognitive impairment, will develop Alzheimer’s disease within a year, with a high level of accuracy.”

Previous studies have found that PET scans and lumbar punctures can predict the onset of dementia, but the former is very expensive and the latter invasive.

A blood test would provide a more cost-effective and less invasive test for a disease which is thought to affect 115 million people around the world.

Image credit: Bev Sykes

Even if you are already in middle age or later, the study has some good news.

Young adults who are in good physical shape performed better in cognitive tests 25 years later, a new study finds.

The study, published in the journal Neurology, also found that even if you didn’t get too much exercise in your youth, it’s never too late to start, as the benefits can still be seen later on.

One of the study’s authors, David R. Jacobs, said:

“Many studies show the benefits to the brain of good heart health.

“This is one more important study that should remind young adults of the brain health benefits of cardio fitness activities such as running, swimming, biking or cardio fitness classes.”

In the study, 2,747 people, whose average age was 25, did a treadmill test which measured their cardiorespiratory fitness (Zhu et al., 2014).

This involved them running on the treadmill while the speed and incline increased, until they had to stop.

Twenty-five years later they were given tests of decision-making, verbal memory and the relationship between their thinking skills and physical actions.

The results showed that for each extra minute they could stay on the treadmill at around 25-years-old, when they reached between 43 to 54-years-of-age, they could:

• recall 0.12 more words on a memory test,
• replace 0.92 more numbers with symbols in a psychomotor test.

Although these numbers might not seem striking, Jacobs said:

“These changes were significant, and while they may be modest, they were larger than the effect from one year of aging.

Other studies in older individuals have shown that these tests are among the strongest predictors of developing dementia in the future.

One study showed that every additional word remembered on the memory test was associated with an 18-percent decrease in the risk of developing dementia after 10 years.”

Even if you are already in middle age or later, the study has some good news.

Those who had managed to boost their fitness levels over the 25 years also enjoyed increased cognitive performance.

Image credit: Tom Wigley

Mice with the KLOTHO gene variant lived longer and were smarter.

Scientists have shown for the first time that people who have a variant of a gene called KLOTHO also have improved cognitive abilities, including better memories and enhanced thinking skills.

In parallel research on mice, the researchers found that when they increased the levels of the gene variant, the mice got smarter, perhaps due to increased connections between nerve cells (Dubal et al., 2014).

This could provide a promising avenue of research for tackling Alzheimer’s disease.

The study’s lead author, Dena Dubal said:

“This could be a major step toward helping millions around the world who are suffering from Alzheimer’s disease and other dementias.

If we could boost the brain’s ability to function, we may be able to counter dementias.”

In the human arm of the research, the scientists gave a whole battery of cognitive tests to over 700 people with and without the gene variant.

About 20-25% of participants had one copy of the gene variant, known as ‘KL-VS’,

Those with one copy, compared to none, performed better on the cognitive tests, regardless of their age, sex or genetic risk factors for Alzheimer’s disease.

Another of the study’s authors, Roderick Corriveau, said:

“These surprising results pave a promising new avenue of research

Although preliminary, they suggest that a form of klotho could be used to enhance cognition for people suffering from dementia.”

Like the humans in the study, the mice also performed better on cognitive tests, including those of memory and learning.

Lennart Mucke, the director of the Gladstone Institute of Neurological Disease, said:

“Overall our results suggest that KLOTHO may increase cognitive reserve or the brain’s capacity to perform everyday intellectual tasks.”

The gene takes its name from the entity in Greek mythology called ‘Clotho’, who was one of the ‘fates’ who were supposed to control the thread of people’s lives.

If this research bears further fruit, the KLOTHO gene could change the fate of many people’s lives.

Image credit: Micah Baldwin

“Some people wander aimlessly through life, but I am not one of them.”

Feeling useful and having a sense of purpose in life are clearly beneficial psychologically, but now research is revealing that there also physical benefits.

No matter what your age, new research finds, having a sense of purpose helps you live longer.

However, the earlier you find a sense of direction and purpose, the better.

The findings come from a study of more than 6,000 people who were followed over 14 years (Hill & Turiano, 2014).

The results showed that people who strongly agreed with statements like the following were less likely to die over the course of the study:

“Some people wander aimlessly through life, but I am not one of them.”

The researchers were surprised that these findings held, even for younger people.

Lead researcher, Patrick Hill, said:

“There are a lot of reasons to believe that being purposeful might help protect older adults more so than younger ones.

For instance, adults might need a sense of direction more, after they have left the workplace and lost that source for organizing their daily events.

In addition, older adults are more likely to face mortality risks than younger adults.

These findings suggest that there’s something unique about finding a purpose that seems to be leading to greater longevity.”

These findings are not isolated.

Recent studies have pointed to both the physical and psychological benefits of finding meaning in life, especially with advancing years:

• A 2009 study of 1,238 elderly people found that those with a sense of purpose lived longer.
• A 2010 study of 900 older adults found that those with a greater sense of purpose were much less likely to develop Alzheimer’s disease.
• Survey data often links a sense of purpose in life with increased happiness.

No matter what your age, then, it’s worth thinking about what gives your life meaning.

It doesn’t necessarily mean you have to have the whole thing planned out, but a sense of direction is clearly beneficial both psychologically and physically.

Find out what kinds of things people say give their lives meaning. Here’s an exercise for increasing meaningfulness and a study finding that feeling you belong increases the sense of meaning.

Image credit: godserv