Can you feed Guinea pigs human food?

I'm 13 years old, and my parents are finally letting me get a pet (a guinea pig). Though, they are saying if I truly want one I would have to pay for it all myself. To buy the Guinea pig itself and its cage, I'm gonna pay 80 dollars plus task. My allowance is 15 dollars a month, I want to be able to by the... show more I'm 13 years old, and my parents are finally letting me get a pet (a guinea pig). Though, they are saying if I truly want one I would have to pay for it all myself. To buy the Guinea pig itself and its cage, I'm gonna pay 80 dollars plus task. My allowance is 15 dollars a month, I want to be able to by the appliances for my guinea pig but I still want some money leftover for me. So I hear some people don't buy special food for guinea pigs, so what food can I give my guinea pig that's already probably in my kitchen. And yes I'm aware they are vegetarians.
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