What will happen to you’re body if you fast max 3-6 days?

So I decided to fast for 3-5 days bc I am a chunky girl and I’ve been eating bad food lately and just kinda wanna cleanse my body from sodium and all the garbage my body may have and just sip on water is that a good idea I know it prob won’t be easy but will it help?

What will happen to you’re body if you fast max 3-6 days?
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