Although many home nations fans might find sitting through this year’s rugby world cup matches a little too nerve-racking at times, the NHS says watching the sport can actually be good for your mental health and wellbeing.
It's very hard to be sure of the exact level of risk that may be associated with any class or individual drug.
It's also worth considering that this study has looked at people prescribed anticholinergics in older age who were diagnosed with dementia at around 82 years. We cannot apply this data to give the risk for a younger adult taking one of these drugs.
The ongoing PROTECT study may provide more insight as it progresses, but the cross-sectional data available at this stage is limited in what it can tell us. For example, we don't know if someone enjoyed doing puzzles because they had high levels of cognitive functioning, or if their cognitive functioning got better after they started doing puzzles.
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These differences in the retinal blood vessels between people with and without Alzheimer's will be of interest to doctors in the field and beyond, and is worthy of further research. But it's far too soon to hail this as a "simple eye test" to detect Alzheimer's.
While interesting, it is difficult to see what practical implications this study has in terms of improving public health and preventing degenerative conditions such as dementia.
Other things that may help keep your brain healthy as you age include regular exercise, eating a healthy diet, not smoking and sticking to the recommendations on alcohol consumption.
While any advance in treatment of Alzheimer's disease is welcome, this research is at a very early stage. We don't know for sure that P. gingivalis causes Alzheimer's disease in humans, or that the drug will work.
We do know that taking care of your teeth and gums will prevent a range of unpleasant complications, such as loss of teeth and gum abscesses.
This study alone doesn't explain the potential role of irisin.
The research did find that restoring irisin in Alzheimer's mice, including by daily swimming, can boost memory and nerve connections.
But we don't know that the same effects would be seen if people with Alzheimer's were given an exercise programme, for example.
We also don't know if any attempt to increase irisin levels through drug-based treatments (as some in the UK media suggested) would be either effective or safe, as no studies have been carried out in people at this stage.
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People should look out for signs of depression and dementia among older family members and friends over Christmas, NHS England expert Professor Alistair Burns urged today.
Problems that may have been hidden can come to the surface or be easier to spot as families or friends get together over the festive season, Prof Burns said.
Depression should not be written off as inevitable in old age and can be treated effectively. Emotional changes can also be the first indication that someone has dementia.
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As we live longer, many of us fear losing our mental faculties with age. The idea that we can stave off decline by doing crossword puzzles is attractive, but this study suggests it's more complicated than that.
While problem-solving seems to be linked with improved mental abilities, it doesn't necessarily protect against the decline of those abilities with age.
The Daily Mirror's headline was misleading. This was a small study that involved healthy young adults with no history of memory problems. It is hard to see how the modest benefits to memory that the researchers found could be taken as proof that they found a way to "beat dementia".
These limitations mean we cannot say for sure that pollution causes dementia. However, the study findings are important. If air pollution does increase dementia risk, measures to reduce pollution could have a big impact on the overall numbers of people getting dementia each year. And we already know that air pollution worsens heart and lung health.
This was a well-designed study that supports what's already known: risk factors for heart disease are also risk factors for dementia.
What's interesting is that the people in this study were aged 65 and older, suggesting that even at this age adopting healthy behaviours could have beneficial effects.
While it's true that people who did not drink, or who had the occasional glass, were also found to be more likely to develop dementia, we cannot say that alcohol protects against dementia. We do not know how much they drank when they were younger.
These higher-risk people may have stopped drinking because of health worries, or possibly because some had concerns about their alcohol use when they were younger.
Also, it's worth noting that those who did not drink alcohol and did not have cardiovascular disease or diabetes were not at increased risk of dementia.
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This study seems to confirm an association between retinal thickness and performance on brain function tests.
However, we shouldn't interpret this to mean that looking at retinal thickness could detect people in the early stages of dementia.
This study did not examine retinal changes and mental decline over a long period of time. Only 4% of people in this study had follow-up brain tests 2 to 3 years later. We don't know whether their performance on this test was typical. For example, some of the low scores may have been caused by feeling unwell or tired at the time.