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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.
1 As you increase the number of drinks per hour, your blood alcohol level steadily increases. 2  The strength of alcohol (proof or percentage) in the drink. 3  Your weight. 4  The more you weigh, the more water is present in your body, which dilutes the alcohol and lowers the blood alcohol level.5  Your sex.hings that affect how quickly the blood alcohol level rises in the body include: 1  The number of drinks per hour. 2  As you increase the number of drinks per hour, your blood alcohol level steadily increases. 3  The strength of alcohol (proof or percentage) in the drink. 4  Your weight.