In India, alcoholism is sometimes considered a "bad habit" or a moral failing. However, a recent scientific study published in the journal Addiction shows something considerably more serious: regular drinking appears to rewire the brain at a genetic level, resulting in a biological trap that makes quitting far more difficult than many families know. 

New research reveals why willpower alone often fails in alcohol addiction

The study, coordinated by researchers at the Institute for Neurosciences, a joint centre of Miguel Hernández University of Elche (UMH) and the Spanish National Research Council (CSIC), investigated post-mortem brain tissue from people who had been drinking heavily for an average of 35 years. The findings offer rare personal evidence for why alcohol use disorder is so difficult to overcome. 

"Alcohol use disorder is one of the leading causes of disease and death worldwide, yet despite its enormous social and health impact, available treatment options remain limited," notes UMH professor Jorge Manzanares, senior author of the study. “Understanding what changes in the brain after decades of alcohol consumption is essential for developing more effective therapies,” he adds. 

The 'hostile takeover' of the brain 

Researchers concentrated on the brain's endocannabinoid system, which governs pleasure, mood, stress, and motivation. Simply said, this system functions as a control panel, balancing reward and emotional responses. 

The researchers examined two important brain regions: the prefrontal cortex, which governs judgement, planning, and impulse control, and the nucleus accumbens, the brain's reward center, which promotes habit formation. 

The findings revealed what may best be termed as a biological "hack". 

The Double Blow 

Researchers discovered a significant increase in gene activity associated with the CB1 receptor, which is intimately linked to desire and reward reinforcement, with levels rising by 125 per cent in the prefrontal cortex and 78 per cent in the nucleus accumbens. 

"CB1 is closely linked to reinforcement of addictive behaviours and relapse risk," notes UMH professor María Salud García-Gutiérrez, primary author of the study. 

At the same time, gene expression of the CB2 receptor, which has a protective and anti-inflammatory role in the brain, decreased by over 50% in both regions. 

“Because CB2 has neuroprotective and anti-inflammatory functions, its reduction suggests a weakening of the brain’s defences against alcohol-induced damage,” García-Gutiérrez notes. 

In consequence, alcohol appears to boost the brain's hunger signals while decreasing its protective shields, resulting in a double onslaught. 

Gene expression simply describes how active a gene is. When CB1 expression increases, the brain becomes more responsive to reward signals. When CB2 expression decreases, protective mechanisms weaken. 

The researchers also discovered changes in FAAH, an enzyme that breaks down mood-related substances, and GPR55, a receptor that has hitherto received little attention in addiction research. 

These alterations show that long-term alcohol consumption not only harms organs but also alters the brain's regulating mechanisms. 

Alcohol is notoriously difficult to quit, not because of a lack of willpower, but because long-term drinking changes the brain on a molecular level. According to emerging neuroscience research, alcohol does not change the DNA sequence itself, but it does alter how genes operate via epigenetic mechanisms—chemical tags that turn specific genes on or off. Repeated alcohol exposure recalibrates brain circuitry involved in reward, stress response, and impulse control. This explains why relapse is so common: desire circuits are chemically increased, making the brain hypersensitive to alcohol-related cues while weakening its ability to reject them. 

Decades of excessive drinking increase activity in the brain's reward system—particularly dopamine signalling pathways—while weakening the prefrontal cortex, which is responsible for judgement, planning, and self-control. In effect, the "go" signals get stronger while the "stop" signals get quieter. This neuroadaptation increases obsessive drinking behaviour, even when people are aware of the consequences. These findings lend support to the definition of alcoholism as a chronic brain condition rather than a habit or moral failing. 

Scientists are currently researching whether these alcohol-induced brain alterations can be reversed. Early data suggests that some brain pathways may recover partially after prolonged abstinence, while focused pharmaceutical and behavioural interventions try to restore damaged circuits. However, recovery is often sluggish and incomplete, highlighting the importance of long-term treatment and monitoring. In short, alcohol dependence continues because it is biologically integrated into the brain's architecture, making quitting a neurochemical battle rather than a human effort. 

Importantly, the brain samples were obtained from the New South Wales Tissue Resource Centre in Australia, and all participants had an alcohol use disorder but no other illegal drug use. This enabled researchers to pinpoint alcohol's unique biological effect. 

According to the authors, determining which components of the endocannabinoid system are altered allows for more precise, personalised therapy. 

For Indian families battling with stigma, the message is clear: addiction is more than just a lack of willpower. In many cases, the entire brain has been rewired.