The effect of lifestyle on some non-communicable diseases: The effect of alcohol on the liver and brain function.

The idea

Alcohol is a recreational drug that affects many organs. In the liver, alcohol is broken down by enzymes; harmful products and long-term excess can damage liver cells, leading to fatty liver, cirrhosis and reduced liver function. This impairs roles such as detoxification and controlling blood glucose and cholesterol. In the brain, alcohol is a depressant: it slows nerve impulses and reaction times, and can impair judgement, balance and coordination. Long-term heavy drinking can cause memory problems and brain damage. The effects depend on the amount and frequency of drinking, so risk increases with sustained excess. Reducing alcohol intake lowers these risks.

What earns the marks

• State that alcohol is broken down in the liver and that excessive long-term drinking can damage liver cells.
• Describe liver effects such as fatty liver and cirrhosis, and link these to reduced liver function.
• Explain that alcohol acts as a depressant on the brain, slowing nerve impulses and increasing reaction time.
• Describe short-term brain effects such as impaired judgement, balance and coordination.
• Describe long-term brain effects such as memory problems and brain damage from sustained heavy drinking.
• State that the risk depends on the amount and frequency of alcohol consumed, so reducing intake lowers the risk.

Common mistakes and how to put them right

• Saying alcohol is a stimulant because it makes people feel relaxed or talkative.

  Put it right: Alcohol is a depressant that slows nervous system activity.

• Claiming the liver is unaffected if a person does not feel drunk.

  Put it right: Liver damage can develop over years without obvious short-term symptoms.

• Stating that alcohol directly kills brain cells immediately after one drink.

  Put it right: Short-term effects are impaired nerve function, while long-term heavy drinking is linked to lasting brain damage.

Exam tips

• Separate liver effects from brain effects clearly, using a short paragraph or bullet for each organ.
• Use precise terms such as depressant, reaction time, judgement, coordination, cirrhosis and fatty liver.
• Link the level of risk to the amount and frequency of alcohol consumed rather than treating all drinking as equally harmful.