Is possible change your friends into vegetarians?

One fast way is to take them to a slaughter house for a "field trip".... or at least show them a video. I've only known a few people who saw something like that and didn't turn vegetarian (they were hunters or coldhearted people). Meat-eaters, though, don't like to change their lifestyle.... especially for a "stupid animal". I don't know your reasons for being a vegetarian, or wanting your friends to be vegetarians, but if you're trying the "it'll make your healthier" tactic... it ain't gonna work. 

As much as it is true, it is hard to convince people that our bodies don't "need" meat. It's basically telling them that their chosen eating habits are unhealthy... they don't appreciate that one bit. You have to rely on the truth of animal cruelty and murdering. Don't be disappointed if your friends don't listen to you.... it's a difficult task. Just remember that even if you "fail", you've planted a little seed in their minds... maybe someone else along the way will water it.

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the only right way to do it is to be a good example of a vegetarian. if you want to preach to people about it then it's a turnoff. if they don't ask then don't tell them anything. their lives aren't your business. do you want people trying to convert you to their beliefs?