Effects Of Increasing Blood Alcohol Content Blood Alcohol Content is the amount of alcohol in your blood recorded in milligrams of alcohol per 100 milliliters of blood. Your BAC depends on the amount of blood (which increases with weight) and the amount of alcohol you consume overtime how fast you drink. The faster you drink, the higher your BAC, as the liver can only handle about one drink per hour—the rest builds up in your blood. BAC Effects on Body Effects on Driving Condition .02 Mellow feeling, slight body warmth. Less inhibited. .05 Noticeable relaxation. Less alert, less self-focused, coordination impairment begins. .08 Definite impairment in coordination & judgment Drunk driving limit, impaired coordination & judgment. .10* Noisy, possible embarrassing behavior, mood swings. Reduction in reaction time. .15 Impaired balance & movement, clearly drunk. Unable to drive. .30 Many lose consciousness. .40 Most lose consciousness, some die. .50 Breathing stops, many die. BAC of .10 means that 1/10 of 1 % (or 1/1000) of your total blood content is alcohol.