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3rd November 2023
The number of people living with dementia in England and Wales could reach 1.7 million by 2040 – some 42% more than previously forecast, according to new research.
Led by University College London and published in The Lancet Public Health, the researchers examined nine waves of data from people over the age of 50 and living in private households in England between 2002 and 2019, from the English Longitudinal Study of Ageing.
They found that the dementia incidence rate decreased by 28.8% between 2002 and 2008 before increasing by 25.2% between 2008 and 2016 – a rate of 2.8% per year.
If the incidence rate continues to increase at this pace, the number of people with dementia in England and Wales is set to increase to 1.7 million (1.62-1.75) by 2040 – approximately twice the number in 2023 – indicating a considerably larger burden on health and social care than anticipated.
The number of people living with dementia was previously predicted to increase by 57% from 0.77 million in 2016 to 1.2 million in 2040.
In the 2023 study, researchers also examined the temporal trend of dementia incidence according to age, sex, and educational attainment.
They found that the rate of dementia onset within older age groups is increasing, as is the rate between education groups. There was both a slower decline between 2002 and 2008 and a faster increase after 2008 in participants with lower educational attainment.
Principal investigator, Professor Eric Brunner, professor of social and biological epidemiology at UCL Institute of Epidemiology and Health Care, commented: ‘We have found that not only is the ageing population a major driver of the trend in England and Wales but also the number of people developing dementia within older age groups is increasing.
‘We don’t know how long this pattern will continue but the UK needs to be prepared so we can ensure that everyone affected, whatever their financial circumstances, is able to access the help and support that they need.’
James White, Alzheimer’s Society’s head of national influencing, added: ‘We know that one in three people born in the UK today will develop this terminal condition in their lifetime. With prevalence on the rise, improving diagnosis has never been more important.
‘Everyone living with dementia must have access to a timely, accurate and specific diagnosis, and who you are or where you live should have no bearing on this.’
27th July 2023
A higher intake of nuts in older adults at risk of cognitive decline could help to slow the decrease in cognitive performance, although the evidence to date is far from clear. Clinical writer Rod Tucker takes a closer look.
The term ‘dementia’ embraces a number of diseases that affect memory, thinking and the ability to perform daily activities. In short, dementia represents the loss of cognitive health, which is key feature of healthy aging.
Unfortunately, the level of dementia appears to be on the rise, becoming a growing and global problem. According to the World Health Organization, there are currently an estimated 55 million people living with dementia worldwide, and this figure is expected to rise in the coming years. Moreover, dementia the seventh leading cause of death and one of the major causes of disability and dependency among older people globally.
There are no known cures for dementia, but efforts have been directed at a range of potential modifiable risk factors, outlined in a 2020 Lancet review. One such factor is diet – particularly the Mediterranean diet, which consists of a high intake of vegetables, legumes, fruits, nuts, cereals and olive oil. But is there evidence to support a higher intake of the individual components in the Mediterranean diet as a means of reducing the risk of cognitive decline?
One constituent that has gained interest in recent years as a strategy to modify cognitive decline, is a higher intake of nuts, but the strength of the evidence supporting this proposition requires more analysis.
Tree nuts and peanuts (henceforth, nuts) are nutrient-dense foods with a myriad of biologically active ingredients such as unsaturated fatty acids and high-quality vegetable protein, combined with an array of vitamins and beneficial minerals, dietary fibre, phenolic compounds and phytosterols. Peanuts, though botanically classified as legumes rather than nuts, do contain a similar nutrient profile as tree nuts and to all intents and purposes can be considered a nut.
To date, there is compelling evidence for the cardiovascular protective effect of a higher nut intake, largely through an improvement in the lipid profile. For example, it is recognised that a daily intake of small amounts of walnuts lowers LDL cholesterol.
Despite the cardiovascular benefits, much less is known about whether the intake of nuts impacts on brain health, and in particular, if this reduces the risk of cognitive decline. Nevertheless, nuts are likely to have an important effect on the brain as recognised by a recent systematic review on depression.
The review, which included 10 studies with over 60,000 participants, concluded that a higher nut consumption could be associated with a lower risk of depression, fewer depressive symptoms and better mood state in the general population.
In relation to cognitive health, another recent review suggested that while the available evidence was limited and inconclusive, there was likely to be a possible role for nuts for the maintenance of cognitive health and the prevention of cognitive decline, particularly in older adults and those at higher risk.
With supportive data from observational studies, the real test of efficacy can only really be determined from randomised, interventional, controlled trials. So, how does this evidence stack up?
Unfortunately, findings have been somewhat mixed. For instance, the PREDIMED-NAVARRA randomised trial explored the impact of a Mediterranean diet on cognitive function. Some 522 participants at high vascular risk were assessed and compared a Mediterranean diet supplemented with either extra-virgin olive oil or mixed nuts versus a low-fat control diet. Interestingly, the study found that both Mediterranean diets appeared to improve cognition compared with a low-fat diet.
In contrast, the MedLey Study, which used a Mediterranean diet in older adults compared to a control diet, failed to detect any effect of a Mediterranean diet on cognitive function among healthy older adults. Similarly, a trial in which healthy older adults were randomised to receive an additional intake of almonds found no improvement in cognitive function. A second interventional trial, this time using walnuts, while showing no effect on cognition in healthy elders, did observe that that walnuts might delay cognitive decline in subgroups at higher risk.
The most recent study to examine the effect of consuming nuts on cognitive function, published in June 2023, looked at the two-year impact on cognitive performance in 6,630 adults with a mean age of 65 years who were deemed at risk of cognitive decline.
Nut consumption was categorised as less than one serving per week, one to three servings, between three and seven servings or more than seven serving per week, with a serving defined as 30g. Although the study was prospective in nature, and therefore subject to several recognised limitations, the researchers did see a benefit from increased nut consumption.
Using those who consumed less than one serving of nuts per week as a comparator, the results showed that eating between three and seven servings per week or more than seven portions both demonstrated more favourable changes in general cognitive performance. Although not the main focus of the study, the researchers also found a potential synergistic interaction between nut consumption and depression. In other words, participants with depressive symptoms at baseline tended to benefit more from the consumption of nuts than those without depression.
There seems to be plenty of observational evidence that nut consumption may help to delay the onset of cognitive decline, as randomised interventional studies have not provided consistent findings. In addition, no studies have specifically addressed the effect of eating nuts on hard clinical outcomes such as the development of dementia or Alzheimer’s disease.
While the latest prospective study does suggest a possible cognitive benefit, there is an urgent need for more randomised, interventional trials before recommending increased consumption of nuts to either delay cognitive decline or prevent the onset or progression of cognitive impairment and dementia.
But given a possible link between the cardiovascular and dementia biochemical pathways, it remains plausible that inclusion of more nuts into an individual’s diet might not only improve their cardiovascular health but could help to ameliorate cognitive decline.
2nd May 2022
Having atopic eczema in older life increases the risk for developing Alzheimer’s disease, according to a study by researchers from UC Berkeley School of Public Health, Berkeley, California, USA.
Alzheimer’s disease (AD) is a neurodegenerative disorder which is progressive and characterised clinically by cognitive decline and physiologically by the presence of two core pathologies; amyloid β plaques (Aβ) and neurofibrillary tangles (NFTs). AD is the most common form of dementia which, according to the World Health Organization (WHO), affected some 55 million people in 2021 with AD accounting for 60-70% of all dementia cases.
Among those with AD, there is a sustained inflammatory response in the brain which is thought to represent a persistent immune response and a factor exacerbating both Aβ and NFTs. Moreover, there is emerging evidence that peripheral inflammation is an early event in the pathogenesis of AD. Atopy, which manifests as either allergic rhinitis, atopic eczema or asthma, represents a set of peripheral inflammatory diseases that have been found to be associated with a modestly increased risk of AD and dementia. To date, only one study has suggested that atopic eczema may be an independent risk factor for new-onset dementia and in particular, AD.
For the present analysis, the team set out to determine whether active atopic eczema among older adults was associated with incident AD and wondered if the strength of this association was dependent upon atopic eczema disease severity. They performed a longitudinal cohort study of patient data collected from the Health Improvement Network, which provides information on a representative sample of patients from UK general practitioners.
The researchers included patients aged 60 to 100 years of age without a prior diagnosis of AD or dementia and for whom the primary exposure was the presence of active atopic eczema and for which at least two prescriptions for treatment of the condition had been issued. The severity of atopic eczema during follow-up was categorised as either mild moderate or severe and the primary outcome was a new diagnosis of dementia during the period of follow-up.
The researchers also examined the reported disease codes for dementia and excluded those where the condition was drug- or alcohol-related or due to trauma or a rarer form (e.g. Huntington’s). The analysis was adjusted for potential confounders including gender, smoking, alcohol status, etc.
Atopic eczema and risk of Alzheimer’s disease
In a total of 1,767,667 individuals aged 60 to 100 years of age at baseline, 57,263 were diagnosed with dementia over mean of 6.8 years of follow-up. The median age of patients with a dementia diagnosis was 82 years, of whom, two-thirds (65%) were female.
Atopic eczema was diagnosed in 12% of the whole cohort and using mild disease severity as the default, 44% had moderate and 5% disease severity over the follow-up period.
Considering AD, the analysis showed that after adjustment for confounders, mild atopic eczema was associated with a 22% higher risk of AD (HR = 1.22) and this risk was higher still for those with moderate (HR = 1.37) and severe (HR = 1.52) disease.
With AD being the most common form of dementia, the researchers also examined the link between atopic eczema and the risk of developing dementia. The incidence of dementia was 57/10,000 person-years among those with atopic eczema compared to 44/10,000 person-years among those without the condition. Overall, patients with atopic eczema had a 27% higher risk for dementia after adjustment for potential confounders (hazard ratio, HR = 1.27, 95% CI 1.23 – 1.30). Further adjustment for co-morbidities slighted attenuated this risk but it remained significant (HR = 1.19, 95% CI 1.16 – 1.22).
The authors concluded that given the increased risk of AD among adults with atopic eczema, clinicians consider the impact of screening those with eczema for signs of cognitive impairment.
Citation
Magyari A et al. Adult atopic eczema and the risk of dementia: A population-based cohort study J Am Acad Dermatol 2022
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