Question :
i am a word of 5 letters
people eat me!
if u remove my 1st letter i will b a form of energy!
if u remove my 1st 2 letters i will be needed 4 living.
if u remove my 1st 3 letters i will be near u.
if u remove my 1st 4 letters i will be a drink 4 u.
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who am i?