Answer:
I can be swallowed But I can also swallow you.
You throw me out when you use me and take me in when you are done.
I am a food with 5 letters. If you remove the first letter I am a form of energy. Remove two and I'm needed to live. Scramble the last 3 and you can drink me down.
*forward* *backwards*is what I do all day. I come in all different shapes and sizes. I can be scary and I can calm you down.
I turn everything around but I cannot move. When you see me you see you!
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