A small amount of alcohol may stimulate your appetite, as it causes the release of digestive juices. But excessive amounts of alcohol tend to stop the process of digestion. The effects on the circulatory system are not so dramatic. You may feel and look a little warm because alcohol dilates your surface blood vessels, but the sensation of warmth is misleading. You actually lose body heat from the expanded blood vessels.
Alcohol affects nerve cell membranes.
It also seems to affect the production and functioning of a number of neurotransmitters in the central nervous system, lowering their functional activity. Neurotransmitters convey messages from one nerve cell to another, so alcohol's effects on your neurotransmitters may explain its effects on you. Your liver, in addition to its role in the oxidation of alcohol, maintains your body's blood-sugar level. But the elimination of alcohol from the body supersedes the liver's other tasks. Alcohol's immediate effect on the brain is most unusual.