I am a word of 5 letters!

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 liiving.
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?

Ans:Wheat