My friends wants me to help me, but myself i dont know the answer

I AM A WORD OF 5 LETTERS. PEOPLE EAT ME. IF YOU REMOVE MY 1ST LETTER, I'LL BE A FORM OF ENERGY. IF YOU REMOVE MY FIRST 2 LETTERS, PEOPLE WILL NEED FOR A LIVING.IF YOU REMOVE MY 1ST 3 LETTERS, I'LL BE NEAR YOU. IF YOU REMOVE MY 1ST 4 LETTERS, I'LL BE A DRINK FOR YOU. WHO AM I?