For physiological reasons, this trend has put women at greatly increased risk for blackouts. If an American male of average weight has eight drinks over four hours—which would make him a moderate drinker at a typical frat party—he would end up with a blood-alcohol reading of 0.107. That’s too drunk to drive, but well below the 0.15 level typically associated with blackouts. If a woman of average weight has eight drinks over four hours, by contrast, she’s at a blood-alcohol level of 0.173. She’s blacked out.6
