© food – a fact of life 2009 alcohol extension. © food – a fact of life 2009 learning...
TRANSCRIPT
© Food – a fact of life 2009
Alcohol
Extension
© Food – a fact of life 2009
Learning objectives
• To understand alcohol is a source of energy.• To understand measurements of alcohol.• To know the safe alcohol intake
recommendations.• To understand that drinking too much alcohol
may damage health.
© Food – a fact of life 2009
What is alcohol?
Alcohol is not a nutrient because it is not essential for
the body.
Alcohol is a source of energy in the diet.
Each gram of pure alcohol provides 29kJ (7kcal) of energy.
© Food – a fact of life 2009
How is alcohol produced?
Alcohol is produced by a process called fermentation.
During fermentation microbes called yeasts grow by feeding on the sugars (e.g. glucose).As they grow, the yeasts produce alcohol and
carbon dioxide. This equation shows what happens:C6H12O6 2C2H5OH + 2CO2 + ENERGY
Glucose Ethanol Carbon
dioxide
© Food – a fact of life 2009
Alcoholic drinks
The amount of alcohol in drinks varies from 0 - 50%.Spirits such as whisky and vodka have a higheralcohol content than wines or beers.
Fruits such as grapes and apples are used to make alcohol drinks such as wine and cider.
Cereals such as barley and rye are used to make beer
and spirits. Spirits are made using a distillation process.
© Food – a fact of life 2009
Alcohol content of drinks
Drink % alcoholSpirits 40Sherry 16Wine 10-14Strong larger, beer or cider 3-4Low alcohol larger, beer or cider 1-1.5
© Food – a fact of life 2009
One unit of alcohol
A standard way of measuring the alcohol content in drinks is in units of alcohol.
One unit contains 8 grams of pure alcohol (ethanol).
A glass of table wine
100ml~10% alcohol
2 pints of low alcohol beer or cider568 ml~2% alcohol
A single pub measure of spirits.
25ml~40% alcohol
A glass of sherry or fortified wine
50ml~20% alcohol
½ pint of regular larger, beer or cider 284 ml~6% alcohol
¼ pint of strong larger, beer or cider 142ml~9% alcohol
© Food – a fact of life 2009
What happens to alcohol in the body?
Alcohol is absorbed from the stomach and the small intestine. This occurs more slowly if alcohol is drunk with food. It is soluble in water and carried around the body in the bloodstream.
Alcohol is removed from the blood by the liver over a period of several hours. The rate at which this happens depends on age, sex, body weight, liver size and how much alcohol was consumed.
© Food – a fact of life 2009
Sensible drinking
The Department of Health has advised that those people who drink should limit intake according to the following guidelines.
Men – not more than 3 to 4 units per day.Women – no more than 2 to 3 units per day.
After a large consumption of alcohol (binge drinking) occurs in one session, it is recommended to leave 48 hours before consuming alcohol again. This allows
the body to break down all the alcohol consumed.
© Food – a fact of life 2009
Possible damage to health
It is best, for pregnant women to avoid alcohol completely as it can damage the unborn baby.
If they do drink, they should limit the amount to one unit of alcohol a day, once or twice a week.
Heavy drinking during pregnancy can cause fetal alcohol syndrome.
© Food – a fact of life 2009
How does alcohol affect the body?
As the level of alcohol in the bloodstream increases it has an affect on a person’s behaviour.
Short term:Reaction times are slower.Increased risk taking.Judgement becomes blurred.Co-ordination is poor. This is why it is dangerous to drink alcohol before driving a car.
Long term:Can lead to liver damage such as cirrhosis and livercancer and the vitamin B deficiency disease beri-beri.
© Food – a fact of life 2009
Review of the learning objectives
• To understand alcohol is a source of energy.• To understand measurements of alcohol.• To know the safe alcohol intake
recommendations.• To understand that drinking too much alcohol
may damage health.
© Food – a fact of life 2009
For more information visit
www.foodafactoflife.org.uk