Chapter 9 Alcohol_Fa2011

Chapter 9 Alcohol_Fa2011 - Chapter9 Alcohol HPEB502Fall2011...

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HPEB 502- Fall 2011 Dr. Kara Montgomery Chapter 9 Alcohol
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What Is Alcohol? Alcohol is not an essential nutrient. Ethanol is the type of alcohol consumed in alcoholic beverages. Methanol (in antifreeze) and isopropanol (rubbing alcohol) are both poisonous to humans. Ethanol is safe for consumption, but excessive amounts are toxic and too much can be fatal. Made by fermentation of yeast and natural sugars in grains (beer) and fruits (wine) Liquor is the concentrated alcohol collected through distillation.
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Why Do People Drink Alcohol?
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What Is a Standard Drink?   See Figure 9.1 in textbook
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What Is Moderate Consumption  of Alcohol?
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What Happens to Alcohol in the  Body? Alcohol is a toxin and the body works quickly to metabolize and eliminate it. You absorb alcohol in ________________ and ___________________. Some alcohol is metabolized by alcohol dehydrogenase enzyme before it is absorbed. _______________ more susceptible to effects of alcohol than _____________ Have 20-30% less of alcohol dehydrogenase than men, absorb more alcohol in stomach Food in stomach ___________ alcohol absorption.
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More on Alcohol Metabolism Alcohol is metabolized primarily in the __________________: one standard drink is metabolized in 1½ - 2 hours. Alcohol dehydrogenase converts alcohol to acetaldehyde (eventually metabolized to CO 2 and water). The microsomal ethanol-oxidizing system (MEOS) also metabolizes alcohol and is revved up when chronically high levels of alcohol are present in liver Alcohol circulates in your blood until metabolized Blood alcohol concentration (BAC) correlates with amount of alcohol in your breath
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Alcohol and the Brain The effects of alcohol on your brain: Depressant of central nervous system Slows down transmission of nerve impulses and reaction time to stimuli Impairs thoughts, actions, behavior The more consumed, the more areas of brain affected If enough consumed, activities of brain stem are suppressed (breathing, heart rate) - resulting in death
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Progressive Effects of Alcohol Table 9.2
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How Can Alcohol Be Harmful?
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