Alcohol is created through the fermentation of grains, fruits, or vegetables by yeast or bacteria converting sugars into alcohol. Moderate alcohol intake causes short-term effects like dizziness and talkativeness, while larger amounts result in slurred speech, nausea, and vomiting. Long-term alcohol consumption can lead to permanent damage of vital organs like the brain and liver, and drinking during pregnancy may cause fetal alcohol syndrome in infants. Alcohol increases domestic violence, child abuse, and the risk of children of alcoholic parents becoming alcoholics themselves. About 2 billion people, or a quarter of the world, consume alcohol with most users being young adults.