You can't imagine what I felt when I read this great news:

All types of beer (2–4% dilution) were found to counteract these stimulation-induced effects and significant reduction of neopterin formation and tryptophan degradation was observed (p < 0.01). Data demonstrate that beer reduces production of neopterin and degradation of tryptophan, both these biochemical pathways are induced during cell-mediated immune response. Data suggest that the immunosuppressive capacity of beer may relate to its anti-inflammatory nature.

Update: Another benefit is pointed out here:

This suppression might be connected with the calming effect of beer since its normalising effect on the tryptophan balance improves the availability of the "happiness hormone" serotonin.