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Alcohol consumption and frontal lobe shrinkage: study of 1432 non-alcoholic subjects
M Kubota1, S Nakazaki, S Hirai
1Department Neurosurgery, Chiba University School of Medicine, Inohana 1-8-1, Chuo-ku, Chiba-shi, Chiba, 260-8670 Japan. kubota@med.m.chiba-u.ac.uk
Objectives:
To evaluate the influences of chronic alcohol consumption on brain volume among social drinkers, as it is well known that alcohol misusers have a high risk of brain shrinkage.
Methods:
Frontal lobe volumes on MRI were compared with the current alcohol habits of consecutive 1432 non-alcoholic subjects.
Results:
After adjusting for other variables, age was found to be the most powerful promoting factor for the shrinkage with a odds ratio of 2.8 (95% confidence interval (95% CI) 1.23-3.06) for each 10 years of age. Regarding alcohol habit, 667 of the subjects were abstainers, and 157, 362, and 246 of the subjects were light (average 88.2 g ethanol/week), moderate (181.2 g/week), and heavy (418.1 g/week) drinkers, respectively. Moderate alcohol consumption did not increase the incidence of frontal lobe shrinkage (odds ratio 0.98; 95% CI 0.73-1.33), whereas heavy drinkers were at a higher risk compared with abstainers (1.80; 1.32-2.46). The contributory rate of alcohol consumption for frontal lobe shrinkage was 11.3%.
Conclusion:
The brain tends to shrink physiologically with age. Heavy alcohol consumption seems to exaggerate this shrinkage in social drinkers. Moderate alcohol consumption does not seem to affect brain volume.