Why might heavier people have a lower BAC after the same amount of alcohol?

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Study for the Yr 10 HPE Alcohol and Other Drugs Test. Review comprehensive content with detailed questions and explanations. Perfect your knowledge on safe and informed decision-making about alcohol and drugs. Prepare thoroughly for your exam!

Multiple Choice

Why might heavier people have a lower BAC after the same amount of alcohol?

Explanation:
The amount of alcohol in the blood depends on how it’s diluted in the body's water. Heavier people generally have more total body water, often because they have more lean tissue. When the same amount of alcohol is consumed, it spreads out into that larger water space, so the concentration in the blood (BAC) is lower. In contrast, lighter people have less body water, so the same amount of alcohol isn’t as diluted and their BAC tends to be higher. So the dilution effect of having more body water in heavier individuals explains why they might have a lower BAC after the same amount of drinking.

The amount of alcohol in the blood depends on how it’s diluted in the body's water. Heavier people generally have more total body water, often because they have more lean tissue. When the same amount of alcohol is consumed, it spreads out into that larger water space, so the concentration in the blood (BAC) is lower. In contrast, lighter people have less body water, so the same amount of alcohol isn’t as diluted and their BAC tends to be higher.

So the dilution effect of having more body water in heavier individuals explains why they might have a lower BAC after the same amount of drinking.

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