How does body weight affect BAC?
Your body weight affects Blood Alcohol Content (BAC) level in that the heavier you are, the more your body weight, the more alcohol it will take to reach a particular Blood Alcohol Content (BAC) level. So, for example, if somebody weighs 250 pounds, it's going to take considerably more drinks of alcohol in order to reach, suppose, a .08 BAC, than it would for somebody who weighs 120 pounds.