Alcohol can disrupt the brain's function if you drink a lot, even at low or moderate levels, like 1-2 drinks a day or 7-14 drinks a week. Drinkers' prefrontal cortex and top-down inhibition will be diminished, so they'll act impulsively. Long-term drinkers (even those who drink 1-2 nights a week, long term) tend to rewire circuitry outside of drink... See more