Setting aside the fact that there are multiple very old, very large religions that are nearly or actually vegan (e.g., Jainism), or that people raised vegan can't easily digest meat or animal products, why on earth do you feel that you or a hospital worker are qualified to determine the beliefs making up someone's identity, when you know absolutely nothing about them?

It took Western government institutions hundreds of years of violent conflict to embrace religious tolerance. I don't recall any major intense violent conflict being fought over dietary preferences.