It doesn’t exactly give you courage.
What it can do is inhibit the part of the logic centers of the brain. People do stupid things because they aren’t thinking of the consequences of doing that stupid thing.
This is often why someone who is drunk feels less stress when they try to do something. Inhibitions stop us from doing things will find stressful. If I tell you to speak to a group of 100 your level of stress will rise and you either not to the speech or do it poorly. Drunk people won’t feel as much stress as sober people thus they will do the speech even if they would have been afraid.
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