Which historical factor increases risk for hepatitis?

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Chronic heavy alcohol use directly harms the liver and triggers inflammation, so it increases the risk of hepatitis. Alcohol metabolism creates toxic byproducts like acetaldehyde and reactive oxygen species that injure hepatocytes and promote an inflammatory response. Over time, this can lead to alcoholic hepatitis, fatty liver changes, and progressive liver damage. In contrast, regular exercise and a vegetarian diet don’t inherently cause liver inflammation, and a history of vaccination actually lowers risk by protecting against hepatitis A and B infections.