need help please importance of food imagery in macbeth

heyy..im new to his and i just really wanna say this is a realy great website its really good that everyone can hep each other out. so welldone...i was also wondering if anybody out there is able to help me i need to write a speach on the importance of the food imagery in macbeth, i dont hav emuch time and i am in real need ofhelp.i need to find quotes from the book, explain the technique used e.g metaphor..what is th eocmparison, what about it ? what it means ? how is it important?..does it lead to something else ? etc and anythign else that you would like to add to help me out ..thankyou to all in advance