Study Links Chronic Heavy Alcohol Use to Dementia Risk

Overview of the Research

A comprehensive study conducted in France has explored the connection between chronic heavy alcohol consumption and the risk of developing dementia, including early onset dementia. This research was published in the British Medical Journal in February 2018 and highlights significant findings regarding the impact of alcohol use disorders.

Key Findings

The study, which analyzed data from a cohort of 31 million individuals, revealed a strong correlation between alcohol use disorders and various types of dementia, even after controlling for confounding factors. Chronic heavy drinking, as defined by the World Health Organization (WHO), involves consuming 60 grams or more of pure alcohol on at least one occasion within the past 30 days. This amount is roughly equivalent to six glasses of wine for men and four for women.

Study Data and Demographics

Data was sourced from a national hospital discharge database in France, without any external funding. Over a five-year period from 2003 to 2013, 31.6 million individuals over the age of 20 were discharged from hospitals with a dementia diagnosis. The prevalence of early-onset dementia, diagnosed before the age of 65, was noted to be one in every 20 cases.

Alcohol Use Disorders and Dementia

During the same timeframe, there were 945,512 diagnosed cases of alcohol use disorders, with 86% classified as alcohol dependency according to ICD-10 criteria. Additionally, 3% of these cases were linked to dementia resulting from alcohol-related brain damage, while 5% involved other alcohol-related disorders. Notably, the strongest association was found between alcohol use disorders and early onset dementia, with 57% of cases exhibiting a significant link.

Conclusions and Recommendations

The researchers concluded that alcohol use is the most significant modifiable risk factor for dementia. Even when excluding brain damage caused by excessive alcohol consumption, individuals with alcohol use disorders still faced double the risk of developing vascular and other types of dementia. Other independent risk factors identified include hypertension, diabetes, smoking, hearing loss, depression, and low educational attainment.

The study underscores the potential underreporting of dementia cases attributable to alcohol abuse, suggesting that the burden of dementia from this cause is substantial and greater than that associated with other recognized risk factors such as depression, hypertension, and smoking.

References

World Health Organization. Indicator metadata registry details. Accessed May 12, 2023. https://www.who.int/data/gho/indicator-metadata-registry/imr-details/458.

Wise J. Large study is “robust” evidence of link between chronic heavy drinking and dementia. BMJ. (2018);360:k814. DOI:10.1136/bmj.k814.