Substance addictions (alcohol, opioids, cocaine, cannabis, amphetamines) and behavioral addictions (gambling, gaming, food) all have a nutritional component often overlooked in the treatment pathway. Psychoactive substances interfere with nutrient absorption, increase their metabolic consumption, suppress appetite, and alter food preferences. The result is that many people in active addiction arrive at the recovery phase with multiple nutritional deficiencies that compromise physical well-being, emotional stability, and resilience to cravings. Integrating nutrition into the recovery pathway is not optional: it's a therapeutic component with direct effects on the neurochemical systems involved in addiction.

Alcohol Addiction: Specific Deficiencies and Nutritional Recovery

Chronic alcohol abuse causes some of the most severe nutritional deficiencies documented in medicine. Thiamine (Vitamin B1): severe thiamine deficiency in alcoholism causes Wernicke-Korsakoff syndrome (acute Wernicke's encephalopathy: confusion, ataxia, nystagmus; chronic Korsakoff syndrome: permanent amnesia and confabulation). It's one of the most important neuropsychiatric emergencies in emergency medicine. High-dose parenteral thiamine supplementation is the emergency treatment. In alcohol recovery programs, oral thiamine supplementation (100 mg/day) is standard. Food sources: wheat germ, pork, legumes, whole grains. Folate (Vitamin B9): alcohol directly inhibits intestinal folate absorption and increases renal excretion. Folate deficiency causes megaloblastic anemia and increases the risk of fetal malformations (severe in alcoholic women who are pregnant or planning pregnancy). Supplementation: 400-800 mcg/day of methylfolate. Vitamin B12 and B6: often deficient due to general malnutrition and for the same reasons as folate. Vitamin D and calcium: chronic alcohol interferes with vitamin D metabolism and reduces bone calcium (increases osteoporosis and fracture risk, already more common in alcoholics due to falls). Zinc and magnesium: both lost excessively in urine due to alcohol's effects on the kidneys. Zinc deficiency contributes to the reduced taste and smell common in chronic alcoholics. Protein: alcoholic cirrhosis reduces hepatic protein synthesis. At this stage, adequate protein intake (1.2-1.5 g/kg/day) supports liver regeneration without overloading an already compromised liver.

Opioid Addiction: Nutrition in Maintenance Programs

Opioid addiction (heroin, morphine, oxycodone, fentanyl) has specific nutritional characteristics. Effects of opioids on the digestive system: constipation is nearly universal (opioids slow intestinal motility). Chronic constipation leads to fecal impaction, anal fissures, hemorrhoids, and reduced appetite. Endocrine alterations: opioids reduce testosterone production (in men) and estrogen (in women): resulting in osteoporosis, reduced muscle mass, sexual dysfunction. Nutrition and methadone: methadone (and buprenorphine) used in substitution therapy have no relevant food interactions except for hepatic metabolism (grapefruit juice inhibits CYP3A4 and can increase methadone plasma levels: avoid it). Nutritional priorities in opioid recovery: adequate protein to recover lost muscle mass (1.2-1.5 g/kg/day), calcium and vitamin D for osteoporosis (bone density screening recommended), constipation management (fiber, hydration, probiotics, physical activity). In advanced addiction treatment services, nutritional assessment is part of the initial evaluation of patients in treatment for opioid addiction.

Cocaine and Stimulant Addiction: Metabolic Recovery

Cocaine, amphetamine, and methamphetamine addiction causes a different nutritional deficiency profile than opioids and alcohol. Acute appetite suppression: cocaine and amphetamines are potent appetite suppressants. During active use, many users eat very little: significant weight loss, deficiencies in all macronutrients and micronutrients. Dopamine depletion: cocaine produces euphoria by blocking dopamine reuptake (accumulation in synapses). Recovery is characterized by anhedonia (inability to feel pleasure) and intense cravings, caused by down-regulation of dopaminergic receptors after chronic hyperstimulation. Nutrition supports restoration of the dopaminergic system: tyrosine (dopamine precursor: found in meats, eggs, dairy, legumes), phenylalanine (tyrosine precursor), omega-3 (supports dopaminergic receptor structure), N-acetylcysteine (NAC: reduces cocaine craving in randomized trials - Mardikian et al., 2007, Progress in Neuropsychopharmacology). Hyperphagia in post-withdrawal: in the recovery phase from stimulants (the "crash phase" and subsequent weeks), appetite returns abruptly with intense cravings for carbohydrates and high-calorie foods (the same mechanism as "binge" post-diet). Managing this moment with nutrient-dense foods (not just sugars and junk food) supports more balanced metabolic recovery.

Food Cravings in Recovery: Sugar and Addiction

One of the least discussed challenges in addiction recovery is craving for hyper-sweet and high-calorie foods that often partially replaces craving for the substance. The neurobiological mechanism: psychoactive substances and high-calorie food partially share the reward circuit (nucleus accumbens, dopamine). In substance withdrawal, the reward system "gravitates" toward other available dopaminergic stimuli: sweet and fatty food is the most accessible. This explains why many ex-smokers gain weight, many ex-alcoholics develop preferences for sweets. Nutritional management of food cravings in recovery: recognize sugar cravings as a normal neurobiological response in recovery (not a character flaw), substitute with natural sweets (fresh fruit, dates, banana with almond butter) that satisfy sweet cravings with lower caloric density and nutritional benefits, stabilize blood sugar with regular, balanced meals (sugar cravings are amplified by blood sugar drops: eating every 3-4 hours reduces them), regular physical activity (reduces addiction cravings through increased endogenous dopamine and endorphins, and reduces food cravings by improving insulin sensitivity). In some cases (binge eating disorder as behavioral addiction), support from a professional specialized in eating disorders is necessary.

The Role of Addiction Treatment Services and Multidisciplinary Teams

In Italy, Addiction Treatment Services (SerD, formerly SerT) are the national health service structures responsible for managing people with addictions. The standard team includes physicians, psychologists, social workers, nurses. In more advanced addiction treatment services (and in therapeutic residential centers) there is also a dietitian as part of the therapeutic team. The dietitian's contribution to addiction treatment: initial nutritional assessment (nutritional status, documented deficiencies, eating habits), personalized nutrition plan for nutritional recovery (specific to the substance used and comorbidities present), nutrition education in group sessions (healthy cooking as therapeutic activity, meals as moments of restored conviviality), management of food cravings during recovery, monitoring the effects of maintenance medications on eating and weight. Meals in community: in residential therapeutic communities, mealtime has therapeutic value beyond nutrition. Cooking together, setting the table, eating with others: these are activities that restore daily living skills and social rituals that addiction has eroded. Many Italian therapeutic communities (CAT, therapeutic reception centers) include cooking as a structured therapeutic activity.

Behavioral Addictions and Nutrition: An Emerging Field

Gambling disorder, gaming addiction, internet addiction, binge eating disorder: behavioral addictions have different nutritional characteristics than substance addictions (there are no nutritional deficiencies from direct substance toxicity) but share some dynamics. Binge eating disorder (BED): the uncontrolled eating disorder is classified as behavioral addiction by the DSM-5. Craving for food in excessive quantities, inability to control intake, temporary relief and subsequent guilt: these are the same patterns as substance addiction. Nutritional management of BED requires the approach of a dietitian specialized in eating disorders, integrated with psychotherapy (CBT or DBT). Gaming addiction and nutrition: problem gamers tend to eat irregularly, skip meals during prolonged sessions, rely on highly palatable, low-preparation foods (pizza, snacks, energy drinks). The "gamer" eating pattern is pro-inflammatory, poor in essential nutrients, and destabilizing to the microbiome. Nutritional intervention (regular meal plans, reduced energy drinks, increased protein and vegetables) is part of the therapeutic program in centers specializing in behavioral addictions.