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What is BAC?

Alcohol is absorbed into blood through the stomach walls and the intestines while a person is drinking. A loss of inhibitions is usually one of the first effects. The more you drink, the more the BACincreases. Nevertheless, the exact time a body needs to absorb alcohol differs from person to person.

The factors affecting the BAC are:
  the quantity of food you have eaten,
  the time of the day,
  your mood,
  your metabolism,
  the levels of tiredness,
  your gender.

Men

Men’s BAC levels usually increase by 0.02 for each unit of alcohol they take, and decrease by 1 unit of alcohol an hour. The consumption of alcohol with a meal will slow its absorption, giving your liver more time to break it down. Therefore, the BAC recorded will be higher on an empty stomach.
 

Women

A woman’s BAC levels usually increase by 0.02 to 0.03 for each unit of alcohol and decrease by ¾ of a unit of alcohol an hour. These rates are higher than men as women are smaller and have more fatty tissue per kg body weight. Men also have more body water and more of the enzyme ADH which breaks down the alcohol in their stomachs; this means that alcohol is more concentrated in their body than in the bodies of women drinking the same amount of alcohol