#321 – Dopamine and addiction: navigating pleasure, pain, and the path to recovery | Anna Lembke, M.D.

Dopamine is a neurotransmitter that serves as the final common pathway for all reinforcing substances and behaviors, playing a key role in pleasure, reward, and motivation. Its release above baseline levels generally feels good, signaling importance for survival and encouraging approach and exploration.

The prefrontal cortex acts as the 'brakes' in the brain, enabling delayed gratification, control, and the appreciation of future consequences. A robust prefrontal cortex is protective against addiction, while its dysfunction (e.g., in ADHD) can increase vulnerability.

Clinically, addiction is defined by behavioral patterns (phenomenology) rather than brain scans or blood tests. These patterns include out-of-control use, compulsive use, cravings, continued use despite consequences, and the presence of tolerance and withdrawal symptoms.

Risk factors for addiction fall into three categories: nature (inherited or inborn genetic vulnerability, about 50-60%), nurture (early childhood development, parenting, trauma, attachment), and neighborhood (simple access to the addictive substance or behavior).

Individuals have different vulnerabilities and preferences for specific substances or behaviors, known as 'drugs of choice.' This inter-individual variability, combined with access, influences which particular addiction a person might develop, potentially as an evolutionary advantage for resource gathering in scarcity.

Repeated use of highly reinforcing substances causes the brain's pleasure-pain balance to tip towards pleasure, but then compensatory neuroadaptation (like 'gremlins' on the pain side) pushes it below baseline. This leads to a chronic dopamine deficit state, where the individual experiences anxiety, irritability, insomnia, dysphoria, and craving.

Withdrawal from alcohol and benzodiazepines can be life-threatening, often requiring medical monitoring or inpatient detox. Opioid withdrawal, while extremely painful, was historically not considered life-threatening, but in recent years, especially for older or medically compromised individuals, slow tapering under medical supervision is recommended.

While a small minority (less than 10%, possibly closer to 1%) of individuals with severe addiction may successfully return to moderate use after an extended period of abstinence, it requires significant effort and specific self-binding strategies. Many ultimately find that abstinence is not only better but also easier due to the ease with which addiction circuits are reignited.

Loss chasing is a phenomenon in pathological gambling where individuals report wanting to lose. This allows them to justify staying in the game longer, indicating an addiction to the pursuit of money or the trance-like state of gambling itself, rather than just winning.

The developing brains of children and adolescents are more vulnerable to highly reinforcing stimuli like online pornography. Early exposure and repeated engagement can strengthen maladaptive coping circuits, making it harder to change these behaviors in adulthood, and potentially substituting for real-life engagement and intimacy.

Parents are advised to limit unsupervised internet access for children under 13, use basic phones, and engage in open, curious discussions about pornography and social media. The focus should be on how these activities make children feel afterward, as negative feelings can be instructive.

While definitive causality is complex, empirical evidence, dose-dependent responses, and intervention studies (removing or limiting social media improves mental health) strongly suggest a causal link. The biological plausibility and strength of association across numerous studies further support that social media contributes to mental health harms in youth.

Exercise is a hormetic stressor that causes the body to upregulate feel-good neurotransmitters like dopamine, serotonin, norepinephrine, and endogenous opioids (endorphins), leading to a 'runner's high.' While generally healthy, exercise can become addictive, especially when combined with quantification and social comparison, leading to compulsive engagement.

Cold water immersion is an immediate hormetic response, causing the body to upregulate feel-good neurotransmitters like dopamine, serotonin, and norepinephrine. Dopamine levels rise and stay elevated for hours, avoiding a deficit state, which can be a powerful mood modulator and a healthy coping strategy for dysregulation.

The revised marshmallow experiment, where children were either told the truth or lied to about a researcher's return, showed that children who were lied to were more likely to eat the marshmallow sooner. This highlights the critical importance of truth-telling and reliability from caregivers in fostering a child's ability to delay gratification and develop appetitive control.

Emerging clinical experience and small trials suggest that GLP-1 agonists like semaglutide may be effective in treating certain addictions, particularly alcohol use disorder and binge eating disorder. They appear to curb desire and pleasure, with one striking case showing complete cessation of alcohol craving in a patient with treatment-refractory alcohol use disorder.

12-step programs are effective peer recovery groups that offer easy access, a low bar for participation, and a unique space for individuals to be fully accepted in their 'flawed and broken selves.' They provide a powerful social support system, including sponsorship, which can be incredibly potent for recovery, especially in a world generally conspiring against mental health.

Understanding a patient's life story, including early life, major milestones, influences, and current goals, is crucial in psychiatry. It allows the clinician to build empathy, understand the causal chain of events leading to their current state, and approach the individual as a whole person rather than just a collection of symptoms or a diagnostic label.