Can I fire someone for being a vegetarian?

Someone who works for me has recently taken up vegetarianism. As this isn't the image I want for my business can I fire him. I also feel I can no longer trust him to do his job on my sheep farm because of his vegetarian beliefs.
Can I fire someone for being a vegetarian?
Updates:
5 mo
Obviously I can't fire someone for his diet but it's shocking to me how many think it's ok to fire someone on a whim for any reason no matter how minor. I'd expect something like that in a Chinese sweat shop but the idea people in a western country are happy to have no rights is astonishing. It's crap treatment like that which drives people into communism.
Can I fire someone for being a vegetarian?
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