What Happens to the Brain When You Stop Drinking Alcohol?

Stopping alcohol consumption is widely associated with health benefits. Better sleep, improved physical health and reduced risks linked to long-term drinking are among the reasons people choose to cut back or stop altogether. However, new research is drawing attention to another part of the picture: what happens inside the brain during a period of abstinence.

Scientists studying alcohol use disorder have long been interested in why some people return to drinking after successfully stopping. A new study involving mice suggests that changes in brain activity during abstinence may be connected to a stronger drive to drink again, particularly when alcohol becomes available.

The research does not mean that stopping alcohol is harmful or that people should avoid abstinence. Instead, it provides researchers with another possible explanation for why relapse can occur and points toward areas of the brain that could eventually help identify people who may need additional support.

What the researchers discovered

Researchers gave mice long-term voluntary access to alcohol before introducing a period when alcohol was no longer available. After this forced period of abstinence, the animals were given access to alcohol again.

The researchers observed that some of the mice showed particularly persistent drinking behaviour. In some cases, the animals continued consuming alcohol even after quinine had been added to make it taste increasingly unpleasant.

This behaviour is significant because it resembles one aspect of problematic alcohol use: continuing to consume alcohol despite negative consequences.

The mice that displayed this behaviour also consumed greater amounts of the unpleasant-tasting alcohol than animals that had not experienced the same period of forced abstinence. The findings suggest that, in at least some animals, a period without alcohol may be followed by behavioural changes that increase the motivation to drink when alcohol becomes available again.

It is important to remember that this was an animal study. Researchers cannot assume that exactly the same process occurs in humans.

The brain region at the centre of the research

The scientists focused on an area of the brain known as the bed nucleus of the stria terminalis, commonly abbreviated as the BNST.

The BNST is a relatively small structure located deep within the brain. Previous research has connected this region with processes involved in stress, anxiety and behaviours associated with alcohol use disorder.

In the new study, researchers monitored activity in cells within the BNST while the mice were exposed to situations associated with alcohol.

One particularly interesting finding occurred when abstinent mice were returned to an environment where they had previously been able to drink. When they encountered the drinking area, some of the animals attempted to drink even though the available liquid was only water.

These attempts were associated with activity in the BNST.

The mice that later showed a stronger tendency to consume bitter alcohol had more than twice the level of activity in this brain region compared with mice that had not undergone the same forced abstinence experience.

Why brain activity before drinking could matter

Perhaps one of the most notable findings was that increased BNST activity could be detected before the animals were given access to the bitter alcohol.

This raises an important question for future research. Could changes in brain activity help scientists identify which individuals are more vulnerable to relapse before problematic drinking begins again?

At present, there is no evidence that BNST activity can be used as a routine screening method for people. The researchers themselves say that much more work is needed to understand exactly what the increased activity represents.

Scientists also do not yet know which specific populations of cells within the BNST are responsible for the observed changes. Understanding those details could potentially help researchers identify biological mechanisms involved in relapse.

Why this matters for alcohol use disorder

Alcohol use disorder is a significant public health issue. It can affect relationships, employment, physical health and mental wellbeing, while long-term alcohol consumption is associated with numerous serious health consequences.

One of the difficulties in treating alcohol use disorder is that recovery does not necessarily follow a simple path. Someone may stop drinking for a period of time and later experience strong urges to drink again.

Relapse can be influenced by many factors, including environmental cues, stress, social circumstances, learned associations and biological changes in the brain.

The new research adds another potential piece to this complicated picture.

If scientists can eventually determine why certain brains become more vulnerable to relapse during abstinence, it could help researchers develop more personalised approaches to prevention and treatment.

The research team is therefore continuing to investigate how the BNST responds to alcohol-related experiences and what role particular neurons may play in persistent drinking behaviour.

What the study does not prove

The findings should not be interpreted as evidence that quitting alcohol causes addiction or that abstinence itself is dangerous.

The study involved mice, not people. Animal research can provide valuable information about biological processes, but findings in animals do not automatically translate into human behaviour.

There are also important unanswered questions about the BNST. Researchers do not yet know precisely why its activity increases after abstinence, which cells are responsible, or whether comparable changes occur in humans.

Further research will be needed before scientists can determine whether BNST activity could have any practical role in predicting relapse or guiding treatment.

Researchers are already beginning to investigate whether similar patterns can be observed in people with alcohol use disorder who are in early abstinence. If comparable findings emerge in human studies, the discovery could become an important area for future clinical research.

A more detailed picture of recovery

The study highlights how complex recovery from alcohol use disorder can be. Stopping drinking remains an important part of treatment for many people, and abstinence can provide substantial health benefits. At the same time, the biological processes involved in recovery can be complicated.

Understanding those processes may help explain why cravings or relapse can occur even after someone has made significant progress.

Rather than viewing relapse simply as a failure of willpower, research like this explores the biological and environmental mechanisms that can influence drinking behaviour. A better understanding of those mechanisms could eventually support more effective prevention and treatment strategies.

For now, the BNST remains an area of active investigation. The findings provide researchers with a possible biological pathway to explore, but they are only an early step toward understanding how abstinence, brain activity and relapse may be connected.

Source

Doyle, M. A., et al. (2026). “Alcohol abstinence precipitates alcohol seeking and aversion-resistant intake in association with increased BNST activity.” Molecular Psychiatry. DOI: 10.1038/s41380-026-03660-x.

Disclaimer

This article is for general informational and educational purposes only. It is not medical advice and should not be used to diagnose or treat alcohol use disorder. The research discussed here was conducted in mice, so its findings should not be assumed to apply directly to humans. Anyone concerned about their alcohol use or considering stopping heavy or prolonged alcohol consumption should seek advice from an appropriately qualified healthcare professional, as withdrawal can sometimes require medical supervision.