New data suggests that alcohol may protect against rheumatoid arthritis, with three units a week exhibiting protective effects and ten units a week being more protective still.
An alcohol consumption of three units per week or more also reduced the risk by smoking or by a genetic predisposition to rheumatoid arthritis.

An increased alcohol ( Ethanol ) consumption of three or more units per week was associated with a decreased risk of developing rheumatoid arthritis ( odds ratio 0.5 ).

Several previous studies have indicated a suppression of the immune system by alcohol and a recent study showed that it prevented development of destructive arthritis.
However, until now, epidemiological investigations on the effects of alcohol on rheumatoid arthritis were scarce and inconsistent.

These data now show not only that alcohol can protect against rheumatoid arthritis and reduce the risk conferred by smoking or susceptible genes, but also gives an idea of the relevant alcohol doses necessary.

The EIRA research team conducted a population-based case control study of incident cases of rheumatoid arthritis ( according to American College of Rheumatology (ACR) 1987 criteria ) among those aged 18-70 years in a defined area of Sweden.

Cases and randomly selected controls completed an extensive questionnaire regarding lifestyle factors, including alcohol consumption and smoking habits.

DNA from 1,204 cases and 871 controls was examined to detect the presence of HLA-DRB1 SE alleles ( a marker indicating genetic risk factor for rheumatoid arthritis ) and all cases were classified by presence of anti-CCP2 antibodies ( anti-cyclic citrullinated peptide Antibodies ) to identify rheumatoid arthritis subtypes.

Gender-specific odds ratios for anti-CCP positive rheumatoid arthritis were calculated with 95% confidence intervals for subjects with different consumptions of alcohol ( none, 3-5 units per week, > 5 units per week ), smoking and HLA-DRB1 SE alleles, compared with subjects less exposed to alcohol ( 0-3 units per week ), using logistic regression models with adjustments made for possible confounders.

Source: European League Against Rheumatism ( EULAR ), 2007

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