Answer:
What is eaten but can also eat?
I am enjoyed by some, despised by others. Some take me for granted, some treasure me like a gift. I last forever, unless you break me first. What am I?
If you break me, I'll not stop working. If you can touch me, my work is done. What am I?
I have two bodies joined together as one. When standing still I run and run.
I am a shimmering field that reaches far. Yet I have no tracks and am crossed without paths. What am I?
No matter how little or how much you use me, you change me every month.