Mason Delacroix
Alcohol is a depressant drug that affects people differently. While it can make some people feel drowsy, it can cause slight mood lifts and a sense of relaxation in others. The liver breaks down most of the alcohol, and the rate at which your body metabolizes it depends on several factors, including genetics, how much alcohol you consumed, your age, weight, and the amount of food you ate. On average, it takes about an hour for the body to eliminate one standard drink. However, this can vary based on factors like sex, age, food intake, and more. Alcohol can be detected in urine, hair, blood, saliva, and breast milk tests, with detection times varying from 6 to 72 hours or more, depending on the test used.
| Characteristics | Values |
|---|---|
| How long does alcohol stay in the system? | Alcohol can be detected in urine from 12 to 130 hours, in breath and saliva for 12-24 hours, in hair for up to 90 days, and in blood for up to 12 hours. |
| Factors that affect the rate at which alcohol is metabolized | Weight, age, gender, body composition, food intake, medications or other drugs, liver size, and weight. |
| Effects of alcohol | Slurred speech, impaired memory, impaired attention, impaired coordination, lowered inhibitions, difficulty concentrating, breathing problems, drowsiness, upset stomach, hangover, vomiting, loss of consciousness, and in some cases, death. |
| Ways to sober up | Drinking water or coffee can make you feel more alert but does not reduce your blood alcohol concentration (BAC). Time is the only true way to sober up. |
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What You'll Learn
The liver metabolises alcohol
Alcohol is predominantly broken down by the liver. The liver is the primary organ responsible for the detoxification of alcohol. After alcohol passes through the stomach, small intestine, and bloodstream, the liver starts its cleanup. It removes about 90% of the alcohol from the blood. The liver enzymes primarily responsible for alcohol processing break down ethyl alcohol (drinking alcohol) into acetaldehyde, which is then further metabolised into substances the body can absorb. Alcohol dehydrogenase, also found in the stomach, breaks down almost all the alcohol consumed by light, social drinkers. It converts alcohol into energy at a rate of about 0.015 g/100mL/hour (reduces BAC by 0.015 per hour). The body generally processes about one standard drink per hour.
The rate at which the body metabolises alcohol depends on several factors, including genetics, how much alcohol is consumed, age, weight, and the amount of food eaten. For example, food in the stomach can inhibit the absorption of alcohol by physically obstructing it from coming into contact with the stomach lining. Food can either absorb alcohol or simply take up space so that alcohol does not enter the bloodstream through contact with the stomach wall. The concentration of alcohol in a drink also matters; drinks with a higher alcohol concentration are generally absorbed faster. Carbonation also makes a difference, with champagne, for instance, being absorbed more quickly than non-sparkling drinks.
The liver is not the only organ involved in metabolising alcohol. About 2-10% of alcohol is removed through the kidneys, lungs, and skin. Additionally, a small amount of alcohol is metabolised by a third enzyme, catalase, which is present in cells throughout the body.
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Food slows absorption
Food slows the absorption of alcohol in the body in two ways. Firstly, food physically obstructs alcohol from coming into contact with the stomach lining. Food can either absorb alcohol or simply occupy space so that alcohol does not enter the bloodstream through contact with the stomach wall. Secondly, food prevents alcohol from passing into the duodenum, which is the upper portion of the small intestine. The small intestine has a large surface area (about the size of a tennis court), so alcohol has more access to enter the bloodstream once it leaves the stomach.
Eating before drinking alcohol is recommended by both AI and non-AI-funded organisations as a mechanism to slow absorption. Eating before drinking can help delay alcohol from entering the bloodstream. For example, Northern Ireland Direct, a non-AI-funded organisation, recommends giving children starch-rich food, such as bread or pasta, so they won't be drinking on an empty stomach. DrinkiQ (Diageo), an AI-funded organisation, advises that eating before drinking will help the most because alcohol will enter the bloodstream almost immediately if the stomach is empty. Similarly, NHS Direct Wales, a non-AI-funded organisation, suggests eating carbohydrates (such as pasta or rice) or fats before drinking alcohol.
While eating before or during alcohol consumption may slow the absorption of alcohol and may lower the blood alcohol concentration (BAC) at any one time, it will not affect the overall amount of alcohol entering the bloodstream. However, it may speed up the metabolization of alcohol and reduce the likelihood of a hangover.
The liver is the primary organ responsible for processing alcohol, removing about 90% of the alcohol from the blood. The remaining alcohol is removed through the kidneys, lungs, and skin. The rate at which the body metabolizes alcohol depends on various factors, including genetics, the volume and strength of the drink, age, weight, and the amount of food consumed.
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Gender differences in processing
Alcohol is predominantly broken down by the liver, which metabolises about 90-98% of the alcohol consumed. The remaining 2-10% exits the body through urine, sweat, or breath. The rate at which the body metabolises alcohol depends on several factors, including genetics, the volume and strength of the drink, how much food was consumed, age, weight, and other genetic factors. Blood alcohol concentration (BAC) is a measure of the percentage of alcohol in the bloodstream. BAC is determined by the rate of alcohol absorption from the gastrointestinal tract into the bloodstream, the volume of distribution in the body, and the rate of elimination.
There are gender differences in the physiological processing and elimination of alcohol, as well as in the sensitivity of the nervous system to its effects. Women have been found to have greater clearance of ethanol per unit of lean body mass, which may explain why they have faster rates of alcohol elimination. However, when the alcohol elimination rate was calculated per unit of liver volume, no gender-related difference was found.
Some studies have found that women are more susceptible to alcohol-related cognitive impairment, especially in tasks involving delayed memory or divided attention functions. Women also appear to be more susceptible to alcohol's long-term health effects, such as alcoholic liver disease, and are more sensitive to alcohol-related liver damage. They develop alcoholic cirrhosis and alcoholic hepatitis at younger ages and with lower alcohol intake. However, the prevalence of chronic alcohol-related problems is lower among women, possibly due to the lower percentage of women who are heavy drinkers compared to men.
Differences in alcohol processing and the nervous system's sensitivity to alcohol's effects may be caused by differences in body composition, ethanol absorption, hormonal balance, and gastric metabolism. The menstrual cycle and variations in female sex hormones have also been speculated to cause these differences, but it is concluded that the menstrual cycle is unlikely to influence alcohol pharmacokinetics.
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Alcohol detection times vary
- Urine tests: Alcohol can typically be detected in urine for 12 to 24 hours after drinking. However, advanced urine tests may detect alcohol for up to 24 hours, and in some cases, it can be detected for up to 120 hours if a person has been drinking excessively. The detection window for urine tests depends on the type of test and the amount of alcohol consumed. For example, EtS urine tests are typically accurate for the first 24 hours, but can detect heavy alcohol use for up to 80 hours.
- Breath tests: Alcohol can be detected on the breath for 12 to 24 hours after drinking.
- Saliva tests: Alcohol is typically detectable in saliva for up to 12 hours after consumption.
- Blood tests: Blood alcohol content (BAC) can be measured as soon as 30 minutes after the first drink, and alcohol can typically be detected in the blood for up to 12 hours.
- Hair tests: Hair tests offer the longest detection window, with alcohol detectable for up to 90 days after consumption. However, hair testing for alcohol is less common than for other substances.
It is important to note that these detection times can vary depending on individual factors such as genetics, age, weight, metabolic rate, liver function, food consumption, and the type and amount of alcohol consumed. Additionally, while the initial effects of alcohol may wear off relatively quickly, alcohol metabolites can remain in the body for longer, especially when testing for them specifically.
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Alcohol's immediate effects
Alcohol is a depressant drug that impacts everyone, and the effects depend on how much one drinks, their health, age, and other factors. Alcohol can be detected in urine from 12 to 130 hours, in breath and saliva for 12 to 24 hours, and in hair for up to 90 days. The liver metabolises almost 90-98% of alcohol, and the rest is eliminated through urine, sweat, or breath. The process takes about two hours per 0.6 fl oz of alcohol in a drink.
The immediate effects of alcohol on the body depend on the amount consumed and individual factors. Alcohol can cause a slight elevation in mood, relaxation, and warmth at lower doses. However, as consumption increases, negative effects such as impaired reasoning and memory, slurred speech, loss of balance, blurred vision, and impaired coordination may occur. Driving ability is significantly impaired at higher doses, and there is a risk of accidents, violence, and risky behaviours. Alcohol also reduces inhibitions, leading to potential antisocial behaviour, crime, or embarrassing actions.
The Blood Alcohol Concentration (BAC) is a measure of the percentage of alcohol in the bloodstream. A BAC of 0.01% is considered slight, with no obvious signs of intoxication. As BAC increases, the effects become more pronounced. At 0.04-0.06%, individuals may experience relaxation and warmth, with slightly impaired reasoning and memory. From 0.07% to 0.09%, speech, balance, vision, and control are mildly impacted, and it becomes illegal to drive in many places. At 0.10-0.12%, coordination and judgment are significantly impacted, and at 0.16-0.30%, there is a risk of vomiting, loss of consciousness, and life-threatening overdose.
In addition to the immediate effects on the brain and nervous system, alcohol can also cause peripheral neuropathy, characterised by numbness in the arms and legs and painful burning in the feet. It can also lead to heart arrhythmias, orthostatic hypotension, diarrhoea, and erectile dysfunction. Heavy alcohol use can disturb the endocrine system, impacting hormones that maintain health and stability. This can contribute to thyroid diseases, abnormal cholesterol levels, reproductive dysfunction, stress intolerance, and diabetes. Alcohol consumption can also weaken the immune system, making the body more susceptible to diseases and infections.
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Frequently asked questions
Alcohol can be detected in the body for anywhere between 6 and 72 hours, depending on the detection test used. Alcohol detection tests can measure alcohol in the blood for up to 12 hours, in breath for 12 to 24 hours, in urine for 12 to 24 hours (72 or more hours after heavier use), in saliva for up to 12 hours, and in hair for up to 90 days.
Signs of intoxication include lowered inhibitions, slurred speech, impaired coordination, trouble remembering things, difficulty concentrating, and breathing problems.
The rate at which the body metabolizes alcohol depends on factors such as genetics, how much alcohol was consumed, age, weight, the amount of food consumed, medications or drugs, and body type.
Alcohol is predominantly broken down by the liver. About 90% of the alcohol is removed by the liver, and the rest comes out through urine, sweat, breath, kidneys, lungs, and skin.
