The findings are to be presented at the Alzheimer's Association International Conference 2012, the world's largest gathering of dementia researchers, in Vancouver, Canada on 18th July 2012. The work is supported by the National Institute for Health Research Collaboration for Leadership in Applied Health Research and Care in the South West Peninsula (NIHR PenCLAHRC).
Little is known about the cognitive effects of binge drinking in older people, which led the PCMD research team to investigate. Dr. Iain Lang from PCMD, who led the study, said: "We know binge drinking can be harmful: it can increase the risk of harm to the cardiovascular system, including the chance of developing heart disease; and it is related to an increased risk of both intentional and unintentional injuries. However, until we conducted our study it was not clear what the effect was of binge drinking on cognitive function and the risk of developing dementia."
The research team analysed data from 5,075 participants aged 65 and older in the Health and Retirement Study (HRS), a biennial, longitudinal, nationally representative survey of U.S. adults, to assess the effects of binge drinking in older people on their function. Initial data were collected in 2002 and participants were followed for eight years. Consumption of four or more drinks on one occasion was considered binge drinking. Cognitive function and memory were assessed using the Telephone Interview for Cognitive Status.
The research showed binge drinking once a month or more was reported by 8.3 per cent of men and 1.5 per cent of women; binge drinking twice a month or more was reported by 4.3 per cent of men and 0.5 per cent of women.The researchers found that:
participants reporting heavy episodic drinking twice a month or more were two-and-a-half times more likely to be in the group experiencing the greatest 10 per cent of decline in cognitive function and also two-and-a-half times more likely to be in the group experiencing the greatest 10% of decline in memory.
Outcomes were similar in men and women.
"In our group of community-dwelling older adults, binge drinking is associated with an increased risk of cognitive decline," said Dr. Lang. "That's a real worry because there's a proven link between cognitive decline and risk of dementia. Those who reported binge drinking at least twice a month were more than twice as likely to have higher levels of decline in both cognitive function and memory. These differences were present even when we took into account other factors known to be related to cognitive decline such as age and level of education."
He added: "This research has a number of implications. First, older people – and their doctors – should be aware that binge drinking may increase their risk of experiencing cognitive decline and encouraged to change their drinking behaviours accordingly. Second, policymakers and public health specialists should know that binge drinking is not just a problem among adolescents and younger adults. We have to start thinking about older people when we are planning interventions to reduce binge drinking."
Notes to Editors
The Peninsula College of Medicine and Dentistry is a joint entity of the University of Exeter, Plymouth University and the NHS in the South West of England. PCMD has created for itself an excellent national and international reputation for groundbreaking research in the areas of diabetes and obesity, neurological disease, child development and ageing, dentistry, clinical education and health technology assessment. www.pcmd.ac.uk
NIHR- PenCLAHRC aims to bring together local universities and their surrounding NHS organisations to test new treatments and new ways of working in specific clinical areas, to see if they are effective and appropriate for everyday use in the health service. Where potential improvements are identified PenCLAHRC helps NHS staff to incorporate them into their everyday working practices, so that patients across the local community receive a better standard of healthcare.
The National Institute for Health Research (NIHR) is funded by the Department of Health to improve the health and wealth of the nation through research. Since its establishment in April 2006, the NIHR has transformed research in the NHS. It has increased the volume of applied health research for the benefit of patients and the public, driven faster translation of basic science discoveries into tangible benefits for patients and the economy, and developed and supported the people who conduct and contribute to applied health research. The NIHR plays a key role in the Government's strategy for economic growth, attracting investment by the life-sciences industries through its world-class infrastructure for health research. Together, the NIHR people, programmes, centres of excellence and systems represent the most integrated health research system in the world. For further information, visit the NIHR website.
Department of Health Disclaimer: The views and opinions expressed therein are those of the authors and do not necessarily reflect those of the NIHR HS&DR programme, NIHR, NHS or the Department of Health.
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