How can you convince a mother to let you become vegetarian?

My friend has a mother that doesn't want her to become vegetarian (not everybody has a hippy mom, I guess). How can we convince her that eating meat is wrong and that there are other alternative choices with the same nutrirional sources?
Update: God also made something called fast food that is tasty but that does not mean that is good for you.....

PS: I think it's cruel to eat animals, if you don't agree with me, that's ok.
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