The data regarding the effects of moderate alcohol intake on fertility is inconclusive at this time. The largest prospective studies conducted in Europe indicate that high levels of alcohol consumption are associated with greater difficulty conceiving.
One small Danish study identified a slight delay in conception even with alcohol ingestion of 5 drinks or less per week. However, this research relies on self-reporting of alcohol consumption which may be inaccurate. In many cases, the studies do not fully account for other factors that could be affecting fertility.