
Alcohol is a psychoactive and toxic substance that has been consumed by humans for at least 13,000 years. While light-to-moderate alcohol intake has been associated with a reduction in all-cause mortality, the World Health Organization (WHO) stated in 2023 that no safe amount of alcohol consumption for cancers and health can be established. Alcohol can cause a range of adverse health effects, particularly when consumed in excessive quantities, and can lead to alcohol use disorders and dependence.
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What You'll Learn

Alcohol is a depressant
Alcohol is a psychoactive substance, altering consciousness, thoughts, and mood. It disrupts the neurotransmitters in the brain that are responsible for transmitting information. This can affect behaviour, thoughts, and feelings. An inhibitory neurotransmitter known as gamma-aminobutyric acid (GABA) is affected by alcohol, reducing the ability of nerve cells to send, receive, or create signals. This results in reduced activity in the brain.
The immediate effects of alcohol can include feelings of relaxation, increased confidence, and reduced inhibition. However, as these short-term effects wear off, other effects can take hold, including feelings of anger, anxiety, depression, and other negative emotions. It is a common misconception that alcohol is a stimulant because it produces stimulating effects like increased heart rate, alertness, and aggression. However, these stimulating effects are brief. As a depressant, alcohol slows down the central nervous system, leading to decreased blood pressure, drowsiness, poor coordination, and reduced alertness.
Alcohol can also increase the risk of dependence and addiction. People may develop a tolerance to alcohol, meaning they need to consume larger amounts to achieve the same effect. This can lead to alcohol abuse and increased alcohol-related harm. Heavy and regular drinking is associated with depression. It is recommended that those experiencing symptoms of depression seek help from a healthcare professional.
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Alcohol is toxic and psychoactive
Alcohol is a psychoactive substance, which means it can alter brain function and result in changes in perception, mood, consciousness, cognition, or behaviour when consumed. Alcohol is the second most consumed psychoactive drug globally, behind caffeine. It has been consumed by humans for its psychoactive effects for thousands of years, and it is often used in social settings.
Alcohol is also toxic, and its long-term effects are considered a major global public health issue. Alcoholic beverages contain ethanol, a psychoactive and toxic substance with dependence-producing properties. Even low levels of alcohol consumption can carry risks and cause harm, and the adverse effects of alcohol are most significant when consumed in excessive quantities or with high frequency.
Alcohol can cause a person to feel a false sense of warmth. While it gives an initial feeling of energy, it is a depressant drug that affects judgment and inhibitions while slowing reaction times. It also depletes the body's fluids, causing dehydration and thirst.
Alcohol is not an essential nutrient, and excessive consumption can lead to nutrient deficiencies by impairing nutrient absorption and increasing nutrient loss. It can also inhibit the production and function of certain enzymes, particularly those involved in the metabolism of nutrients and the detoxification process in the liver.
The only way to remove alcohol from the body is to allow time for the liver to metabolize it, at a rate of about one drink per hour. Time is the only thing that will sober a person up; a cold shower, fresh air, exercise, or black coffee will not help.
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Alcohol is the second most consumed drug
Alcohol is a central nervous system (CNS) depressant drug that has been consumed since the Neolithic period, as early as 7000 BCE in China. It is fully legal and available in most countries, with nearly 140 million people in the US alone reporting drinking alcohol in the last month. This makes alcohol the second most consumed drug worldwide.
Alcohol is produced through the hydration of ethylene or by brewing via the fermentation of sugars with yeast. The sugars are typically derived from sources such as steeped cereal grains (e.g., barley), grape juice, and sugarcane products. The ethanol-water mixture can be further purified through distillation.
As a drug, alcohol affects judgement and inhibitions, slows reaction times, and can cause a person to feel thirsty, leading to increased consumption. It produces a range of effects, including euphoria, decreased anxiety, increased sociability, sedation, and impairment of cognitive, memory, motor, and sensory functions. These effects have made alcohol consumption a cornerstone of community gatherings and personal milestones.
However, alcohol is one of the more dangerous drugs to withdraw from. Alcohol withdrawal can cause confusion, paranoia, anxiety, insomnia, agitation, tremors, fever, nausea, vomiting, autonomic dysfunction, seizures, and hallucinations. Additionally, excessive alcohol consumption can lead to nutrient deficiencies by impairing nutrient absorption and increasing nutrient losses.
Alcohol abuse is a significant issue, with 10.2% (28.3 million) of people aged 12 or older in the US struggling with an alcohol use disorder (AUD). Alcohol availability and consumption are positively associated with nuisance, loitering, panhandling, and disorderly conduct. Furthermore, thousands of deaths are associated with alcohol overdose and drunk driving each year.
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Alcohol is a cause of birth defects
Alcohol consumption during pregnancy is the leading preventable cause of birth defects, developmental disabilities, and learning disabilities. This condition is known as fetal alcohol syndrome (FAS), a permanent condition that occurs when a pregnant woman consumes any amount of alcohol. FAS is the most severe condition within a group of conditions called fetal alcohol spectrum disorders (FASDs).
FASDs can present in childhood or early adulthood with mild social or intellectual concerns, or they can manifest as birth defects and growth problems during pregnancy. Diagnosis of FASDs can be challenging due to the variety of symptoms and severity spectrum. However, pediatric providers may diagnose FAS based on the child's size, specific physical signs, and symptoms that develop over time. These signs may include abnormal facial features, such as a smooth connection between the nose and upper lip, a thin upper lip, and small eyes.
Animal studies have found that binge-like drinking patterns, where the fetus is exposed to high blood alcohol concentrations (BACs) over short periods, are particularly harmful, even if the overall alcohol amount is less than continuous drinking patterns. Binge drinking may be more detrimental because it results in higher BACs, potentially affecting critical periods of brain development, and may be associated with repeated withdrawal episodes. Long-term human studies have confirmed that children of binge-drinking mothers exhibit severe cognitive and behavioral deficits.
Furthermore, excessive alcohol consumption can lead to nutrient deficiencies by impairing nutrient absorption and increasing nutrient losses. While alcohol can provide calories, it does not provide any essential nutrients. Therefore, alcohol consumption during pregnancy can not only cause birth defects but also potentially impact the fetus's overall nutritional status.
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Alcohol is a factor in suicides
Alcohol is a depressant that affects judgment and inhibitions, and increases the risk of suicide. It is a factor in suicides in several ways. Firstly, alcohol increases suicidal thoughts and reduces inhibitions, making it more likely for someone with suicidal thoughts to act on them. Secondly, alcohol abuse can lead to addiction, which has been conceptualized as a form of chronic suicide. Finally, alcohol is often used as self-medication for mental illnesses, mood disorders, and trauma, but its chronic use can lead to tolerance, dependence, and addiction, creating another strain on a person's life.
Alcohol affects people differently, but it generally impairs judgment and inhibitions, slows reaction times, and causes a loss of body heat. It can also lead to dehydration and a person may continue to drink more to quench their thirst. The stimulating effects of alcohol include impulsivity and aggression, while sedating effects can include sadness and despair. Alcohol can reduce a person's awareness of their negative emotions and impair their ability to use healthy coping mechanisms to deal with stressful situations. This can be harmful to someone experiencing suicidal thoughts, as it reduces their inhibitions and increases the risk of moving from suicidal ideation to an attempt.
Research has shown that the suicide rate is substantially elevated among alcoholics and that suicide is the cause of death for a significant percentage of alcoholics. In 2019, nearly a third of suicide deaths in the US were linked to alcohol consumption. Worldwide, suicide rates have increased by about 60% in the last 45 years, and alcohol consumption has been found to be a risk factor for autodestructive behavior.
While there is rarely one reason behind a person's suicide, alcohol abuse and addiction can be significant contributing factors. It is important to address the stigma surrounding suicide and create safe spaces for individuals to seek help for their mental health and substance abuse issues.
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Frequently asked questions
No, alcohol is a depressant. It slows down the central nervous system, which affects a person's brain and body functions.
Yes, alcohol can be addictive. Prolonged and excessive alcohol use can lead to alcohol dependence or alcoholism.
No, alcoholics often cannot stop drinking without help from other people.




































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