6. Carrie Underwood
Carrie Underwood grew up on a farm in Oklahoma and while she never really thought about what happened to the cows when it was time to slaughter them, once she did, she was done with beef. She started at first by giving up red meat, then took it a step further, eating less and less meat overall. It was difficult in her home state, but she was opened up to a new world after coming to California for American Idol and seeing all the vegan food options. Her home of Nashville offers plenty of options as well and while technically vegetarian, she sticks to an almost vegan diet.