Tebakan

I am a word of five letters !
People eat me !
If you remove my 1 letter i will be a form Of energy !
If you remove my first 2 letters i will be needed for living.
If you remove my first 3 letters i will be near you.
If you remove my first 4 letters i will be a drink (3 LETTERS BUT PRONOUNCED AS ONE LETTER) for you.
Who am i ?

 

WHEAT