Alcohol is considered a macronutrient because it provides energy. Alcohol has about 7 calories per gram, the measurement of energy. The calories obtained from alcohol are considered to be "empty" because they contain no beneficial nutrients, such as vitamins and minerals. Beer, wine, and distilled liquors (such as whisky, vodka, rum, and gin) are common dietary sources of alcohol. Alcohol is a central nervous system depressant and acts as a mild anesthetic and tranquilizer. It is toxic in large quantities.

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