Written by: Therapy Near Me Editorial Team

Clinically reviewed by: qualified members of the Therapy Near Me clinical team

Last updated: 01/02/2026

This article is intended as general information only and does not replace personalised medical or mental health advice. Learn more about our Editorial Policy.

Alcohol consumption is a common aspect of social gatherings in many cultures, including Australia, but its impact on the brain can be profound and detrimental. This article explores the effects of alcohol on brain structure and function, drawing on the latest scientific research to provide a comprehensive overview.

Initially, alcohol acts as a central nervous system depressant, slowing down brain function and altering behavior. The immediate effects of alcohol include impaired judgement, decreased reflexes, and poorer motor coordination. Memory impairment is also common, particularly in the formation of new memories, which is why people may not remember what happened while they were intoxicated (White, 2003).

Alcohol can increase the likelihood of aggressive behaviors and mood swings due to its disinhibiting effects on the brain’s prefrontal cortex, which normally regulates self-control and inhibition (Giancola, 2000). This area of the brain is responsible for decision-making and moderating social behaviour, and its impairment can lead to inappropriate or risky behaviours.

Long-term alcohol consumption can lead to persistent changes in brain function and structure. One of the most severe effects is alcohol-related brain damage (ARBD), which includes conditions such as Wernicke-Korsakoff Syndrome (WKS) and alcoholic dementia. WKS is caused by a deficiency in thiamine (vitamin B1), which is common in heavy drinkers, leading to severe cognitive impairment and coordination problems (Thomson et al., 2002).

Chronic alcohol use is associated with the reduction in brain volume. Heavy drinking can lead to the loss of brain tissue, particularly in areas involved in cognition and decision-making. MRI studies have shown that alcoholics often have a significant reduction in both white and grey matter in the brain (Oscar-Berman & Marinković, 2007).

Alcohol affects several neurotransmitter systems within the brain, notably gamma-aminobutyric acid (GABA) and glutamate systems. Alcohol enhances the GABAergic system, leading to sedation, while inhibiting glutamate receptors, which can disrupt cognitive functions. Over time, the brain may become less responsive to alcohol’s effects, a phenomenon known as tolerance, leading to higher consumption and greater alcohol dependency (Koob & Le Moal, 2006).

The brain’s capacity to recover from alcohol’s effects depends on several factors including the duration and intensity of alcohol use. Some cognitive functions can improve with sustained abstinence, particularly in younger individuals who have not been drinking heavily for long. However, some brain damage, especially in cases of Wernicke-Korsakoff Syndrome, is irreversible (Oscar-Berman & Marinković, 2007).

The effects of alcohol on the brain range from immediate cognitive and behavioral changes to long-term brain damage. Understanding these impacts is crucial, particularly as societal norms around drinking continue to evolve. Education on the risks associated with alcohol consumption and promoting healthier choices can help mitigate these effects.

• Giancola, P. R. (2000). Executive functioning: A conceptual framework for alcohol-related aggression. Experimental and Clinical Psychopharmacology, 8(4), 576-597.
• Koob, G. F., & Le Moal, M. (2006). Neurobiology of addiction. Academic Press.
• Oscar-Berman, M., & Marinković, K. (2007). Alcohol: effects on neurobehavioral functions and the brain. Neuropsychology Review, 17(3), 239-257.
• Thomson, A. D., Guerrini, I., & Marshall, E. J. (2002). The evolution and treatment of Korsakoff’s syndrome: out of sight, out of mind? Neuropsychology Review, 12(2), 115-149.
• White, A. M. (2003). What happened? Alcohol, memory blackouts, and the brain. Alcohol Research & Health, 27(2), 186-196.

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