Word Puzzle: I am a word of five letters

I am a word of five letters!
People eat me!
If u remove my first letter i will be a form of energy!
If u remove my first 2 letters i will be needed 4 living.
If u remove my first 3 letters i will be a preposition
If u remove my first 4 letters i will be a drink 4 u.
Answer if u r mastermind!

 

Answer:

People eat me! “WHEAT
If u remove my first letter i will be a form of energy! “HEAT”
If u remove my first 2 letters i will be needed 4 living. “EAT”
If u remove my first 3 letters i will be a preposition “AT”
If u remove my first 4 letters i will be a drink 4 u. “T”