How alcohol travels through your body
Your bloodstream distributes alcohol quickly to your brain, kidney, lungs and liver. On average, your liver takes an hour to break down one unit of alcohol. This can depend on:
- your weight
- your gender
- your age
- how quickly your body turns food into energy
- how much food you’ve eaten
- the strength and type of alcohol
- any medicine you’re taking
Weight
If your weight is low, you feel the effects of alcohol more quickly because you have less tissue to absorb alcohol.
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Age
Most children and young people are smaller and weigh less than adults. Alcohol can affect them quickly. Children and young people’s brains are still developing, so even small amounts of alcohol can be damaging.
Your body changes as you reach old age. You have increased body fat and decreased body water. This affects how your body processes alcohol. If you still drink the same amount of alcohol you drank in adulthood, you feel the effects more severely. Older people who drink too much alcohol are at greater risk of physical and mental health problems including:
- stroke
- heart disease
- cancer
- depression
- confusion
- dementia
Gender
Alcohol affects women more quickly than men. Women are usually smaller and weigh less than men, and have less tissue to absorb alcohol.
A woman’s body has more fat and less water than a man’s body. If a man and woman are the same size and drink the same amount, the alcohol is stronger in the woman’s blood than in the man’s. The woman will get drunk more quickly and feel the effects for longer.
Alcohol also stays in women’s blood for longer. They have lower levels of the enzyme that breaks down alcohol.
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Women feel the effects of alcohol more quickly before a period and during ovulation. The contraceptive pill can have the opposite effect – it takes longer for alcohol to leave the body. A woman in this situation might drink more than she realises before she feels the effects.
Stomach
You absorb 20 per cent of alcohol into your bloodstream through your stomach and the rest into your bloodstream through your small intestine.
Drinking a small amount of alcohol stimulates your appetite because it increases the flow of stomach juices. A large amount of alcohol dulls your appetite and can cause malnutrition.
You can develop a stomach ulcer by drinking too much alcohol. This can happen when the stimulated gastric juices mix with the high alcohol content and irritate your stomach lining.
Bloodstream
When alcohol enters your bloodstream, it widens your blood vessels. This causes:
- blushing, as there is a greater flow of blood to the skin surface
- a temporary feeling of warmth
- heat loss and a rapid decrease in body temperature
- a drop in blood pressure
Brain
Alcohol dulls the parts of your brain that control how your body works. This affects your actions and your ability to make decisions and stay in control. Alcohol influences your mood and can also make you feel down or aggressive.
As the concentration of alcohol in your bloodstream increases, your behaviour and body functions change. At first, you may feel happy and less inhibited, but after several drinks you’ll probably:
- slur your words
- have blurred vision
- lose your coordination
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There is no immediate way to sober up. It takes time for your body to process alcohol. The morning after a heavy night’s drinking, you are likely to have a high concentration of alcohol in your bloodstream.
You may not be sober or safe to drive a vehicle. The legal alcohol limit for driving measures the amount of alcohol in your breath, blood or urine.
Kidneys
Alcohol is a diuretic and increases urine production. When you drink alcohol, you need to urinate more often. This causes thirst and dehydration.
Lungs
When alcohol is fizzy, you can inhale this. From your lungs, alcohol goes quickly into your bloodstream.
Liver
When you drink alcohol, your liver oxidises 95 per cent of it. This means your liver converts alcohol into water and carbon monoxide. Your liver can only oxidise one unit of alcohol an hour.
Drinking with an empty or full stomach
If you drink alcohol with an empty stomach, the alcohol passes directly into your bloodstream. If you’ve eaten before drinking, the rate of alcohol absorption slows down but doesn’t stop.
Types of drink
Alcohol mixed with water or fruit juice is absorbed more slowly. Alcohol mixed with fizzy drinks or mixers is absorbed more quickly.
More useful links
- Getting help with drug or problems
- Alcohol units
- How alcohol affects your health
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