Well, not all vegans are vegans for health reasons.
In one of her interviews when her veganism came up she mentioned something about not wanting to put stuff in her body that couldn't be digested properly so I got the impression health was at least part of the reason she's vegan.
Edited because I found her quote. It was her interview with Soderbergh in Interview Magazine.
interviewmagazine.com/film/rooney-mara-1SODERBERGH: Oh . . . Not so interesting. So why don’t you eat normal food?
MARA: By “normal,” do you mean food that has been genetically modified? I try to eat food that hasn’t been washed in ammonia and then packaged in the shape of breaded dinosaurs filled with cheese—even though those are very tasty. I like to eat food that can actually make it through the 20-plus feet of my small intestine.
SODERBERGH: So you’re not vegan because of the senseless, pointless, morally repugnant, environmentally catastrophic practice of animal farming, but because of your little intestine?
MARA: All of those reasons play a role.
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