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Alcohol dilates peripheral blood vessels, but has been known to actually. constrict some blood vessels in the brain, lowering the oxygen content. Alcohol dilates peripheral blood vessels, but has been known to actually  constrict some blood vessels in the brain, lowering the oxygen content.
But alcohol is process the same for everyone. Once you drink alcohol, it slowly moves through the body and absorbs into the blood stream. Most of the alcohol gets absorbed through the stomach and small intestine. Once in the bloodstream, alcohol can cross the blood-brain barrier and affect the brain.