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Study finds global dementia cases may triple by 2050 unless risk factors addressed

by 198 Japan News
January 9, 2022
in JAPAN NIGERIA NEWS
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Washington [US], January 9 (ANI): According to a new study, the number of adults, aged 40 or older, living with dementia worldwide is expected to nearly triple, from an estimated 57 million in 2019 to 153 million in 2050.

The research has been published in the ‘The Lancet Public Health’.

The study also looked at four risk factors for dementia–smoking, obesity, high blood sugar, and low education–and highlighted the impact they will have on future trends. For example, improvements in global education access are projected to reduce dementia prevalence by 62 million cases worldwide by 2050. But this will be countered by anticipated trends in obesity, high blood sugar, and smoking, which are expected to result in an additional 68 million dementia cases.

The authors highlighted the urgent need to roll out locally tailored interventions that reduced risk factor exposure, alongside research to discover effective disease-modifying treatments and new modifiable risk factors to reduce the future burden of disease.

“Our study offers improved forecasts for dementia on a global scale as well as the country-level, giving policymakers and public health experts new insights to understand the drivers of these increases, based on the best available data”, said lead author Emma Nichols from the Institute for Health Metrics and Evaluation (IHME) at the University of Washington, USA.

“These estimates can be used by national governments to make sure resources and support are available for individuals, caregivers, and health systems globally,” she added.

She continued, “At the same time, we need to focus more on prevention and control of risk factors before they result in dementia. Even modest advances in preventing dementia or delaying its progression would pay remarkable dividends. To have the greatest impact, we need to reduce exposure to the leading risk factors in each country. For most, this means scaling up locally appropriate, low-cost programmes that support healthier diets, more exercise, quitting smoking, and better access to education. And it also means continuing to invest in research to identify effective treatments to stop, slow, or prevent dementia.”Dementia is currently the seventh leading cause of death worldwide and one of the major causes of disability and dependency among older people globally–with global costs in 2019 estimated at more than USD 1 trillion. Although dementia mainly affects older people, it is not an inevitable consequence of ageing.

A Lancet Commission published in 2020 suggested that up to 40 per cent of dementia cases could be prevented or delayed if exposure to 12 known risk factors were eliminated–low education, high blood pressure, hearing impairment, smoking, midlife obesity, depression, physical inactivity, diabetes, social isolation, excessive alcohol consumption, head injury, and air pollution.

The study predicted that the greatest increase in prevalence will occur in eastern sub-Saharan Africa, where the number of people living with dementia is expected to climb by 357 per cent, from nearly 660 000 in 2019 to more than 3 million in 2050, mainly driven by population growth–with Djibouti (473 per cent), Ethiopia (443 per cent), and South Sudan (396 per cent) seeing the greatest increases.

Similarly, in North Africa and the Middle East, cases are predicted to grow by 367 per cent, from almost 3 million to nearly 14 million, with particularly large increases in Qatar (1926 per cent), the United Arab Emirates (1795 per cent), and Bahrain (1084 per cent).

By contrast, the smallest increase in the number of dementia cases is projected in the high-income Asia Pacific, where the number of cases is expected to grow by 53 per cent, from 48 million in 2019 to 74 million in 2050–with a particularly small increase in Japan (27 per cent). In this region, the risk of dementia for each age group is expected to fall, suggesting that preventive measures, including improvements in education and healthy lifestyles, are having an impact.

Similarly, in Western Europe, the number of dementia cases is expected to rise by 74 per cent, from almost 8 million in 2019 to nearly 14 million in 2050. Relatively small increases in cases are expected in Greece (45 per cent), Italy (56 per cent), Finland (58 per cent), Sweden (62 per cent), and Germany (65 per cent). In the UK, the number of dementia cases is projected to increase by 75 per cent, from just over 907 000 in 2019 to almost 16 million in 2050.

Globally, more women are affected by dementia than men. In 2019, women with dementia outnumbered men with dementia 100 to 69. And this pattern is expected to remain in 2050.

“It’s not just because women tend to live longer,” said co-author Dr Jaimie Steinmetz from IHME, University of Washington, USA.

“There is evidence of sex differences in the biological mechanisms that underlie dementia. It’s been suggested that Alzheimer’s disease may spread differently in the brains of women than in men, and several genetic risk factors seem related to the disease risk by sex,” Steinmetz added.

According to co-author Professor Theo Vos from IHME, University of Washington, USA, “Low- and middle-income countries, in particular, should implement national policies now that can mitigate dementia risk factors for the future, such as prioritising education and healthy lifestyles. Ensuring that structural inequalities in access to health and social care services can be addressed and that services can additionally be adapted to the unprecedented needs of an increasing older population with complex care needs will require considerable planning at both local and national levels.”The authors acknowledged that their analysis was limited by a lack of high-quality data in several parts of the world, including sub-Saharan Africa, Eastern Europe, and Central America, and by studies using different methodologies and definitions of dementia. They also noted that they were unable to consider all 12 risk factors from the 2020 Lancet Commission report because they were limited to risk factors included in the GBD study and only included risk factors with strong evidence of association.

However, including additional risk factors would not have necessarily led to a change in the forecasted prevalence, unless changes in exposure to a given risk factor were expected as well. Finally, they noted that the study examined the overall prevalence of dementia, and it is possible that clinical subtypes, such as vascular dementia, may have different relationships with risk factors, which could affect the results.

Writing in a linked Comment, Dr Michael Schwarzinger and Dr Carole Dufouil, Bordeaux University Hospital in France (who were not involved in the study) said, “In our opinion, the authors’ efforts to build on GBD 2019 are still oversimplifying the underlying mechanisms that cause dementia [they] provide apocalyptic projections that do not factor in advisable changes in lifestyle over the lifetime. There is a considerable and urgent need to reinforce a public health approach towards dementia to better inform the people and decision-makers about the appropriate means to delay or avoid these dire projections.” (ANI)



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