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Which of the following factors can increase a person's Blood Alcohol Content (BAC)?

  1. Increased size and body weight

  2. Having food in the stomach

  3. Higher percentage of body fat

  4. Age under 21

The correct answer is: Higher percentage of body fat

The correct answer highlights that a higher percentage of body fat can increase a person's Blood Alcohol Content (BAC) due to the way alcohol is distributed in the body. Alcohol is water-soluble and not fat-soluble, meaning that individuals with higher body fat percentage have less body water to dilute the alcohol consumed. As a result, when alcohol enters the bloodstream, it becomes more concentrated in individuals with higher body fat, leading to a higher BAC. In contrast, increased size and body weight generally contribute to a lower BAC because a larger body has more water to dilute the alcohol. Having food in the stomach can slow the absorption of alcohol, leading to a lower BAC initially because it takes longer for the alcohol to enter the bloodstream. Finally, being under age 21 is more about legality and restrictions rather than a direct physiological factor affecting BAC, although it is an important consideration for responsible alcohol service.