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1. Heavy drinking may change DNA, leading to increased craving for alcohol.

2. Omkaram Gangisetty et al, Hypermethylation of Proopiomelanocortin and Period 2 Genes in Blood Are Associated with Greater Subjective and Behavioral Motivation for Alcohol in Humans, Alcoholism: Clinical and Experimental Research (2018). DOI: 10.1111/acer.13932.

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