Long-Term Alcohol Consumption: Effects on Body Systems

Chronic Alcohol Use: Multisystem Health Consequences

Sustained heavy drinking (>14 drinks/week men, >7 women) damages nearly every organ system. Effects are dose- and duration-dependent.

1. Liver (Primary Site of Metabolism)

• Steatosis (fatty liver) → reversible with abstinence.
• Alcoholic steatohepatitis (ASH) → inflammation, ballooning, fibrosis.
• Cirrhosis (irreversible architectural distortion) → portal hypertension, liver failure, HCC risk.
• 10–20% of heavy drinkers develop cirrhosis.

2. Cardiovascular

• Hypertension (dose-related).
• Cardiomyopathy (dilated) → heart failure.
• Arrhythmias (atrial fibrillation, "holiday heart").
• Stroke (ischemic and hemorrhagic).
• Note: Low-dose (1 drink/day) may have J-curve for CHD, but net harm at population level.

3. Neurological

• Cognitive impairment (executive function, memory, visuospatial).
• Wernicke-Korsakoff syndrome (thiamine deficiency): ophthalmoplegia, ataxia, confabulation.
• Peripheral neuropathy (axonal, sensorimotor).
• Cerebellar degeneration (ataxia).
• ↑ Dementia risk (including early-onset).

4. Gastrointestinal

• Gastritis, erosions, ulcers (↑ acid, ↓ mucosal defense).
• Pancreatitis (acute/chronic) — alcohol #2 cause after gallstones.
• Malabsorption (villous atrophy, pancreatic insufficiency).
• Esophageal cancer (synergy with smoking).

5. Cancer (IARC Group 1 Carcinogen)

• Oral cavity, pharynx, larynx, esophagus, liver, colorectal, breast (linear dose-response).
• Acetaldehyde (metabolite) + oxidative stress + impaired DNA repair.

6. Immune System

• Impaired innate (neutrophil, macrophage) and adaptive (T/B cell) immunity.
• ↑ Risk: pneumonia, TB, post-surgical infection, poor vaccine response.

7. Reproductive

• Men: Hypogonadism, ↓ testosterone, ↓ spermatogenesis, ED.
• Women: Menstrual irregularity, infertility, early menopause.
• Pregnancy: FASD (no safe level).

8. Nutritional

• Empty calories (7 kcal/g) displace nutrients.
• Deficiencies: Thiamine, folate, B12, B6, vitamin D, zinc, magnesium, protein.

9. Mental Health

• Depression, anxiety (bidirectional).
• Alcohol use disorder (AUD) — 10–15% lifetime prevalence.
• Suicide risk ↑ (disinhibition, hopelessness).

10. Physical Appearance

• Weight gain (calories + appetite stimulation).
• Facial puffiness, telangiectasias, rhinophyma, premature aging, skin dehydration.

Risk Reduction

• Abstinence or low-risk limits (Canada: ≤2 drinks/week; US: ≤2/day men, ≤1/day women).
• Alcohol-free days weekly.
• Screening (AUDIT-C) in primary care.