When taking alcohol your brain receives signals from the original glutamate (excitatory acid). Getting into your receptors, it disrupts their ability to properly transmit signals, which ultimately affects your speech, coordination, perception of reality, and so on.
Since the adoption of alcohol alters your perception of reality, you may find that the random actions of people were not accidental, and intentional. Therefore, the already heated because companies often have heated debates.
Alcohol is horrible sleeping pills. Acceptance of alcohol can disrupt REM sleep (your brain will actively adapt to the effects of ethanol molecules), and eventually you'll either wake up constantly or not at all be able to sleep. Your brain will not be able to dive into a deep sleep and relax properly.
Another common misconception: after drinking alcohol your sex will be wild. Yes, alcohol awakens the desire, but the show itself may not take place. Alcohol dilates the arteries and "relaxes" the body as a whole, and for some parts of the body in this case it is not very good.
For shy people alcohol acts as a "social lubricant" and relieves mild stress. In recent years, sociologists and epidemiologists have conducted a long-term study of loneliness and its impact on life expectancy. Loneliness is literally life-threatening, so drink a glass on Friday or two in the company, such as colleagues, for these people is a salvation.
Just do not binge drink. Anything done in excess is unhealthy.