Answer:
I am a desire to munch
I am a person who pretends to be someone else
If you lose me you may cause people around you to lose me too.
I start new then become old. Start clean but be one dirty. I usually start big then become little.
With three leaves, I am just a plant. Add another leaf and everyone will want me for good luck. What am I?
I flow from the Homerβs mouth when he sees doughnuts.