Veganism ?

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i'm not a vegan but my this girl in my class is. she was lecturing us about how being vegan can be good for everyone and how nobody really needs meat or dairy or all that stuff in their diet. i've heard some people have fainted or something while on a vegan diet but all she said was they just didn't prepare their body properly for the vegan diet. i don't think the vegan diet is for everyone and i'm certainly not a vegan. my friends and i were bashed by this girl because she was saying stuff like "y'all are just making excuses. anyone can be a vegan if they commit." do you think just anyone can become a vegan if they just commit? what's your opinion on vegaism?